diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 9e4a2561..f29c4d07 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -19,8 +19,8 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python-version: ["3.10", "3.11", "3.12", "3.13"]
-        sphinx: ["~=8.0"]  # temporary limit, bring it back to newest sphinx once we are sphinx9 compatible
+        python-version: ["3.11", "3.12", "3.13", "3.14"]
+        sphinx: [""]  # Newest Sphinx
         myst-parser: [""]  # Newest MyST Parser (any)
         include:
           # Just check the other platforms once
@@ -39,6 +39,12 @@ jobs:
             sphinx: "~=8.0"
             myst-parser: "~=4.0"
             pillow: "==11.0.0"
+          # Oldest known-compatible dependencies
+          - os: ubuntu-latest
+            python-version: "3.10"
+            sphinx: "==5.0.0"
+            myst-parser: "==1.0.0"
+            pillow: "==11.0.0"
           # Mid-range dependencies
           - os: ubuntu-latest
             python-version: "3.11"
@@ -47,9 +53,9 @@ jobs:
             pillow: "==11.0.0"
           # Newest known-compatible dependencies
           - os: ubuntu-latest
-            python-version: "3.13"
-            sphinx: "~=8.0"
-            myst-parser: "==4.0.0"
+            python-version: "3.14"
+            sphinx: "~=9.0"
+            myst-parser: "~=5.0"
             pillow: "==11.0.0"
 
     runs-on: ${{ matrix.os }}
@@ -71,42 +77,9 @@ jobs:
     - name: Run pytest
       run: pytest --durations=10
 
-  coverage:
-    needs: [tests]
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v6
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v6
-      with:
-        python-version: "3.11"
-        cache: pip
-    - name: Install dependencies
-      run: |
-        pip install -e .[testing]
-        pip freeze
-
-    - name: Run pytest
-      run: pytest --durations=10 --cov=myst_nb --cov-report=xml --cov-report=term-missing
-
-    - name: Create cov
-      run: coverage xml
-      # for some reason the tests/conftest.py::check_nbs fixture breaks pytest-cov's cov-report outputting
-      # this is why we run `coverage xml` afterwards (required by codecov)
-
-    # TEMPORARY FIX: Disable codecov until we can get it working again
-    - name: Upload to Codecov
-      uses: codecov/codecov-action@v5
-      if: false
-      with:
-        name: myst-nb-pytests
-        flags: pytests
-        files: ./coverage.xml
-
   publish:
 
-    name: Publish to PyPi
+    name: Publish to PyPI
     needs: [tests]
     if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags')
     runs-on: ubuntu-latest
diff --git a/myst_nb/sphinx_ext.py b/myst_nb/sphinx_ext.py
index 1a61ef78..9a7b7996 100644
--- a/myst_nb/sphinx_ext.py
+++ b/myst_nb/sphinx_ext.py
@@ -7,7 +7,6 @@
 from importlib import resources as import_resources
 import os
 from pathlib import Path
-import sys
 from types import ModuleType
 from typing import Any, Iterator, cast
 
@@ -194,14 +193,10 @@ def _get_file_hash(path: Path):
 
 @contextlib.contextmanager
 def _import_resources_path(package: ModuleType, resource: str) -> Iterator[Path]:
-    if sys.version_info < (3, 9):
-        with import_resources.path(package, resource) as path:
-            yield path
-    else:
-        with import_resources.as_file(
-            import_resources.files(package).joinpath(resource)
-        ) as path:
-            yield path
+    with import_resources.as_file(
+        import_resources.files(package).joinpath(resource)
+    ) as path:
+        yield path
 
 
 def add_css(app: Sphinx):
diff --git a/pyproject.toml b/pyproject.toml
index c0ac0ea4..f8369760 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,4 +1,4 @@
- [build-system]
+[build-system]
 requires = ["flit_core >=3.11,<4"]
 build-backend = "flit_core.buildapi"
 
@@ -20,6 +20,7 @@ classifiers = [
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Programming Language :: Python :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: PyPy",
     "Topic :: Software Development :: Libraries :: Python Modules",
@@ -42,7 +43,7 @@ dependencies = [
     "myst-parser>=1.0.0",
     "nbformat>=5.0",
     "pyyaml",
-    "sphinx>=5,<9",  # If we get bugs for older versions, just pin this higher
+    "sphinx>=5",  # If we get bugs for older versions, just pin this higher
     "typing-extensions",
     # ipykernel is not a requirement of the library,
     # but is a common requirement for users (registers the python3 kernel)
@@ -174,12 +175,14 @@ filterwarnings = [
     'ignore:datetime.datetime.utcnow\(\) is deprecated:DeprecationWarning:jupyter_cache',
     # From matplotlib’s dependencies
     'ignore::DeprecationWarning:pyparsing',  # imports deprecated `sre_constants`
-    # From myst-parser on Sphinx 9
-    'ignore:.*MystReferenceResolver.app.*:DeprecationWarning',
+    # From myst-parser on Sphinx 9 we hit RemovedInSphinx11Warning
+    'ignore:.*MystReferenceResolver.app.*',
     # Upstream myst-parser still hits env.app deprecations under Sphinx 9
     'ignore:.*env\\.app.*:DeprecationWarning:myst_parser',
     # Windows issues, some may need to be fixed in MyST-NB, others are upstream
     'ignore:Proactor event loop does not implement add_reader:RuntimeWarning:zmq',
+    # We deal with this pending deprecation later
+    'ignore:Argument "writer_name" will be removed in Docutils 2.0:PendingDeprecationWarning'
 ]
 
 markers = [
diff --git a/tests/conftest.py b/tests/conftest.py
index 30184da3..f2bdb3b7 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -16,6 +16,7 @@
 from nbdime.prettyprint import pretty_print_diff
 import nbformat as nbf
 import pytest
+import docutils
 import sphinx
 from sphinx import version_info as sphinx_version_info
 from sphinx.util.console import nocolor
@@ -304,6 +305,7 @@ class FileRegression:
         r"original_uri=\"[^\"]*\"\s",
         # TODO: Remove when support for Sphinx<8 is dropped,
         re.escape(' translated="True"'),
+        re.escape(' translated="1"'),
         re.escape(" translation_progress=\"{'total': 4, 'translated': 2}\""),
     )
 
@@ -316,4 +318,10 @@ def check(self, data, **kwargs):
     def _strip_ignores(self, data):
         for ig in self.ignores:
             data = re.sub(ig, "", data)
+
+        if docutils.__version_info__ < (0, 22):
+            data = data.replace('linenos="False"', 'linenos="0"')
+            data = data.replace('nowrap="False"', 'nowrap="0"')
+            data = data.replace('linenos="True"', 'linenos="1"')
+            data = data.replace('internal="True"', 'internal="1"')
         return data
diff --git a/tests/test_eval/test_sphinx.txt b/tests/test_eval/test_sphinx.txt
index 0f630937..34d39dc9 100644
--- a/tests/test_eval/test_sphinx.txt
+++ b/tests/test_eval/test_sphinx.txt
@@ -4,17 +4,17 @@
             Inline evaluation
         <container cell_index="1" cell_metadata="{}" classes="cell" exec_count="1" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     a = 1
         <paragraph>
             Evaluated inline variable: 
             <inline classes="output text_plain">
                 1
-        <literal_block classes="output text_plain" language="myst-ansi" linenos="False" xml:space="preserve">
+        <literal_block classes="output text_plain" language="myst-ansi" linenos="0" xml:space="preserve">
             1
         <container cell_index="3" cell_metadata="{}" classes="cell" exec_count="2" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     import base64
                     from IPython.display import Image
                     string = "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"
diff --git a/tests/test_execute/test_complex_outputs_unrun_auto.xml b/tests/test_execute/test_complex_outputs_unrun_auto.xml
index 31937b98..87700f78 100644
--- a/tests/test_execute/test_complex_outputs_unrun_auto.xml
+++ b/tests/test_execute/test_complex_outputs_unrun_auto.xml
@@ -195,7 +195,7 @@
                         <literal_block classes="output text_plain" language="myst-ansi" xml:space="preserve">
                             <IPython.core.display.Latex object>
                     <container mime_type="text/latex">
-                        <math_block classes="output text_latex" nowrap="False" number="True" xml:space="preserve">
+                        <math_block classes="output text_latex" nowrap="0" number="True" xml:space="preserve">
                              a = b+c 
         <paragraph>
             The plotting code for a sympy equation (=@eqn:example_sympy).
@@ -216,7 +216,7 @@
                     <container mime_type="image/png">
                         <image candidates="{'*': '_build/jupyter_execute/e2dfbe330154316cfb6f3186e8f57fc4df8aee03b0303ed1345fc22cd51f66de.png'}" uri="_build/jupyter_execute/e2dfbe330154316cfb6f3186e8f57fc4df8aee03b0303ed1345fc22cd51f66de.png">
                     <container mime_type="text/latex">
-                        <math_block classes="output text_latex" nowrap="False" number="True" xml:space="preserve">
+                        <math_block classes="output text_latex" nowrap="0" number="True" xml:space="preserve">
                             \displaystyle \left(\sqrt{5} i\right)^{\alpha} \left(\frac{1}{2} - \frac{2 \sqrt{5} i}{5}\right) + \left(- \sqrt{5} i\right)^{\alpha} \left(\frac{1}{2} + \frac{2 \sqrt{5} i}{5}\right)
     <section ids="interactive-outputs" names="interactive\ outputs">
         <title>
diff --git a/tests/test_execute/test_complex_outputs_unrun_cache.xml b/tests/test_execute/test_complex_outputs_unrun_cache.xml
index 31937b98..87700f78 100644
--- a/tests/test_execute/test_complex_outputs_unrun_cache.xml
+++ b/tests/test_execute/test_complex_outputs_unrun_cache.xml
@@ -195,7 +195,7 @@
                         <literal_block classes="output text_plain" language="myst-ansi" xml:space="preserve">
                             <IPython.core.display.Latex object>
                     <container mime_type="text/latex">
-                        <math_block classes="output text_latex" nowrap="False" number="True" xml:space="preserve">
+                        <math_block classes="output text_latex" nowrap="0" number="True" xml:space="preserve">
                              a = b+c 
         <paragraph>
             The plotting code for a sympy equation (=@eqn:example_sympy).
@@ -216,7 +216,7 @@
                     <container mime_type="image/png">
                         <image candidates="{'*': '_build/jupyter_execute/e2dfbe330154316cfb6f3186e8f57fc4df8aee03b0303ed1345fc22cd51f66de.png'}" uri="_build/jupyter_execute/e2dfbe330154316cfb6f3186e8f57fc4df8aee03b0303ed1345fc22cd51f66de.png">
                     <container mime_type="text/latex">
-                        <math_block classes="output text_latex" nowrap="False" number="True" xml:space="preserve">
+                        <math_block classes="output text_latex" nowrap="0" number="True" xml:space="preserve">
                             \displaystyle \left(\sqrt{5} i\right)^{\alpha} \left(\frac{1}{2} - \frac{2 \sqrt{5} i}{5}\right) + \left(- \sqrt{5} i\right)^{\alpha} \left(\frac{1}{2} + \frac{2 \sqrt{5} i}{5}\right)
     <section ids="interactive-outputs" names="interactive\ outputs">
         <title>
diff --git a/tests/test_glue/test_parser.txt b/tests/test_glue/test_parser.txt
index d2b975b6..d23398ac 100644
--- a/tests/test_glue/test_parser.txt
+++ b/tests/test_glue/test_parser.txt
@@ -4,25 +4,25 @@
             Glue Tests
         <container cell_index="1" cell_metadata="{}" classes="cell" exec_count="1" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     from myst_nb import glue
         <container cell_index="2" cell_metadata="{}" classes="cell" exec_count="2" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     glue("key_text1", "text1")
                     glue("key_float", 3.14159)
             <container classes="cell_output" nb_element="cell_code_output">
-                <literal_block classes="output text_plain" language="myst-ansi" linenos="False" xml:space="preserve">
+                <literal_block classes="output text_plain" language="myst-ansi" linenos="0" xml:space="preserve">
                     'text1'
-                <literal_block classes="output text_plain" language="myst-ansi" linenos="False" xml:space="preserve">
+                <literal_block classes="output text_plain" language="myst-ansi" linenos="0" xml:space="preserve">
                     3.14159
         <container cell_index="3" cell_metadata="{}" classes="cell" exec_count="3" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     glue("key_undisplayed", "undisplayed", display=False)
         <container cell_index="4" cell_metadata="{'scrolled': True}" classes="cell" exec_count="4" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     import pandas as pd
                     
                     df = pd.DataFrame({"header": [1, 2, 3]})
@@ -68,7 +68,7 @@
                     </div>
         <container cell_index="5" cell_metadata="{}" classes="cell" exec_count="5" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     import matplotlib.pyplot as plt
                     
                     plt.plot([1, 2, 3])
@@ -149,7 +149,7 @@
                 Math
             <container cell_index="8" cell_metadata="{}" classes="cell" exec_count="6" nb_element="cell_code">
                 <container classes="cell_input" nb_element="cell_code_source">
-                    <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                    <literal_block language="ipython3" linenos="0" xml:space="preserve">
                         import sympy as sym
                         
                         f = sym.Function("f")
@@ -158,8 +158,8 @@
                         f = y(n) - 2 * y(n - 1 / sym.pi) - 5 * y(n - 2)
                         glue("sym_eq", sym.rsolve(f, y(n), [1, 4]))
                 <container classes="cell_output" nb_element="cell_code_output">
-                    <math_block classes="output text_latex" nowrap="False" number="True" xml:space="preserve">
+                    <math_block classes="output text_latex" nowrap="0" number="True" xml:space="preserve">
                         \displaystyle \left(\sqrt{5} i\right)^{\alpha} \left(\frac{1}{2} - \frac{2 \sqrt{5} i}{5}\right) + \left(- \sqrt{5} i\right)^{\alpha} \left(\frac{1}{2} + \frac{2 \sqrt{5} i}{5}\right)
             <target refid="equation-eq-sym">
-            <math_block classes="pasted-math" docname="with_glue" ids="equation-eq-sym" label="eq-sym" nowrap="False" number="1" xml:space="preserve">
+            <math_block classes="pasted-math" docname="with_glue" ids="equation-eq-sym" label="eq-sym" nowrap="0" number="1" xml:space="preserve">
                 \displaystyle \left(\sqrt{5} i\right)^{\alpha} \left(\frac{1}{2} - \frac{2 \sqrt{5} i}{5}\right) + \left(- \sqrt{5} i\right)^{\alpha} \left(\frac{1}{2} + \frac{2 \sqrt{5} i}{5}\right)
diff --git a/tests/test_parser/test_complex_outputs.xml b/tests/test_parser/test_complex_outputs.xml
index 13bdcc7f..d1348155 100644
--- a/tests/test_parser/test_complex_outputs.xml
+++ b/tests/test_parser/test_complex_outputs.xml
@@ -201,7 +201,7 @@
                             </table>
                             </div>
                     <container mime_type="text/latex">
-                        <math_block classes="output text_latex" nowrap="False" number="True" xml:space="preserve">
+                        <math_block classes="output text_latex" nowrap="0" number="True" xml:space="preserve">
                             \begin{tabular}{lllrr}
                             \toprule
                             {} &         a &  b &      c &      d \\
@@ -227,7 +227,7 @@
             <container classes="cell_output" nb_element="cell_code_output">
                 <container nb_element="mime_bundle">
                     <container mime_type="text/latex">
-                        <math_block classes="output text_latex" nowrap="False" number="True" xml:space="preserve">
+                        <math_block classes="output text_latex" nowrap="0" number="True" xml:space="preserve">
                              a = b+c 
                     <container mime_type="text/plain">
                         <literal_block classes="output text_plain" language="myst-ansi" xml:space="preserve">
@@ -246,7 +246,7 @@
                     <container mime_type="image/png">
                         <image candidates="{'*': '_build/jupyter_execute/8c43e5c8cccf697754876b7fec1b0a9b731d7900bb585e775a5fa326b4de8c5a.png'}" uri="_build/jupyter_execute/8c43e5c8cccf697754876b7fec1b0a9b731d7900bb585e775a5fa326b4de8c5a.png">
                     <container mime_type="text/latex">
-                        <math_block classes="output text_latex" nowrap="False" number="True" xml:space="preserve">
+                        <math_block classes="output text_latex" nowrap="0" number="True" xml:space="preserve">
                             \displaystyle \left(\sqrt{5} i\right)^{\alpha} \left(\frac{1}{2} - \frac{2 \sqrt{5} i}{5}\right) + \left(- \sqrt{5} i\right)^{\alpha} \left(\frac{1}{2} + \frac{2 \sqrt{5} i}{5}\right)
                     <container mime_type="text/plain">
                         <literal_block classes="output text_plain" language="myst-ansi" xml:space="preserve">
diff --git a/tests/test_render_outputs/test_basic_run.xml b/tests/test_render_outputs/test_basic_run.xml
index 93ab5b60..a9c2fd21 100644
--- a/tests/test_render_outputs/test_basic_run.xml
+++ b/tests/test_render_outputs/test_basic_run.xml
@@ -6,9 +6,9 @@
             some text
         <container cell_index="1" cell_metadata="{}" classes="cell" exec_count="1" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     a = 1
                     print(a)
             <container classes="cell_output" nb_element="cell_code_output">
-                <literal_block classes="output stream" language="myst-ansi" linenos="False" xml:space="preserve">
+                <literal_block classes="output stream" language="myst-ansi" linenos="0" xml:space="preserve">
                     1
diff --git a/tests/test_render_outputs/test_complex_outputs.xml b/tests/test_render_outputs/test_complex_outputs.xml
index 811508b2..a593c5bf 100644
--- a/tests/test_render_outputs/test_complex_outputs.xml
+++ b/tests/test_render_outputs/test_complex_outputs.xml
@@ -1,7 +1,7 @@
 <document source="complex_outputs">
     <container cell_index="0" cell_metadata="{'init_cell': True, 'slideshow': {'slide_type': 'skip'}}" classes="cell" exec_count="1" nb_element="cell_code">
         <container classes="cell_input" nb_element="cell_code_source">
-            <literal_block language="ipython3" linenos="False" xml:space="preserve">
+            <literal_block language="ipython3" linenos="0" xml:space="preserve">
                 import matplotlib.pyplot as plt
                 import pandas as pd
                 import sympy as sym
@@ -89,13 +89,13 @@
             Text Output
         <container cell_index="11" cell_metadata="{'ipub': {'text': {'format': {'backgroundcolor': '\\color{blue!10}'}}}}" classes="cell" exec_count="2" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     print("""
                     This is some printed text,
                     with a nicely formatted output.
                     """)
             <container classes="cell_output" nb_element="cell_code_output">
-                <literal_block classes="output stream" language="myst-ansi" linenos="False" xml:space="preserve">
+                <literal_block classes="output stream" language="myst-ansi" linenos="0" xml:space="preserve">
                     
                     This is some printed text,
                     with a nicely formatted output.
@@ -105,7 +105,7 @@
             Images and Figures
         <container cell_index="13" cell_metadata="{'ipub': {'figure': {'caption': 'A nice picture.', 'label': 'fig:example', 'placement': '!bh'}}}" classes="cell" exec_count="3" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     Image("example.jpg", height=400)
             <container classes="cell_output" nb_element="cell_code_output">
                 <image candidates="{'*': '_build/jupyter_execute/a4c9580c74dacf6f3316a3bd2e2a347933aa4463834dcf1bb8f20b4fcb476ae1.jpg'}" height="400" uri="_build/jupyter_execute/a4c9580c74dacf6f3316a3bd2e2a347933aa4463834dcf1bb8f20b4fcb476ae1.jpg">
@@ -118,7 +118,7 @@
                 The plotting code for a matplotlib figure (\cref{fig:example_mpl}).
             <container cell_index="17" cell_metadata="{'ipub': {'code': {'asfloat': True, 'caption': 'a', 'label': 'code:example_mpl', 'widefigure': False}, 'figure': {'caption': '', 'label': 'fig:example_mpl', 'widefigure': False}}}" classes="cell" exec_count="4" nb_element="cell_code">
                 <container classes="cell_input" nb_element="cell_code_source">
-                    <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                    <literal_block language="ipython3" linenos="0" xml:space="preserve">
                         plt.scatter(np.random.rand(10), np.random.rand(10), label="data label")
                         plt.ylabel(r"a y label with latex $\alpha$")
                         plt.legend();
@@ -131,7 +131,7 @@
             The plotting code for a pandas Dataframe table (\cref{tbl:example}).
         <container cell_index="20" cell_metadata="{'ipub': {'code': {'asfloat': True, 'caption': '', 'label': 'code:example_pd', 'placement': 'H', 'widefigure': False}, 'table': {'alternate': 'gray!20', 'caption': 'An example of a table created with pandas dataframe.', 'label': 'tbl:example', 'placement': 'H'}}}" classes="cell" exec_count="5" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     df = pd.DataFrame(np.random.rand(3, 4), columns=["a", "b", "c", "d"])
                     df.a = [r"$\delta$", "x", "y"]
                     df.b = ["l", "m", "n"]
@@ -193,16 +193,16 @@
             Equations (with ipython or sympy)
         <container cell_index="22" cell_metadata="{'ipub': {'equation': {'label': 'eqn:example_ipy'}}}" classes="cell" exec_count="6" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     Latex("$$ a = b+c $$")
             <container classes="cell_output" nb_element="cell_code_output">
-                <math_block classes="output text_latex" nowrap="False" number="True" xml:space="preserve">
+                <math_block classes="output text_latex" nowrap="0" number="True" xml:space="preserve">
                      a = b+c 
         <paragraph>
             The plotting code for a sympy equation (=@eqn:example_sympy).
         <container cell_index="24" cell_metadata="{'ipub': {'code': {'asfloat': True, 'caption': '', 'label': 'code:example_sym', 'placement': 'H', 'widefigure': False}, 'equation': {'environment': 'equation', 'label': 'eqn:example_sympy'}}}" classes="cell" exec_count="7" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     y = sym.Function("y")
                     n = sym.symbols(r"\alpha")
                     f = y(n) - 2 * y(n - 1 / sym.pi) - 5 * y(n - 2)
@@ -211,7 +211,7 @@
                 <image candidates="{'*': '_build/jupyter_execute/8c43e5c8cccf697754876b7fec1b0a9b731d7900bb585e775a5fa326b4de8c5a.png'}" uri="_build/jupyter_execute/8c43e5c8cccf697754876b7fec1b0a9b731d7900bb585e775a5fa326b4de8c5a.png">
         <container cell_index="25" cell_metadata="{}" classes="cell" exec_count="7" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     from IPython.display import display, Markdown
                     
                     display(Markdown("**_some_ markdown**"))
diff --git a/tests/test_render_outputs/test_complex_outputs_latex.xml b/tests/test_render_outputs/test_complex_outputs_latex.xml
index d1c82738..136559de 100644
--- a/tests/test_render_outputs/test_complex_outputs_latex.xml
+++ b/tests/test_render_outputs/test_complex_outputs_latex.xml
@@ -1,7 +1,7 @@
 <document source="complex_outputs">
     <container cell_index="0" cell_metadata="{'init_cell': True, 'slideshow': {'slide_type': 'skip'}}" classes="cell" exec_count="1" nb_element="cell_code">
         <container classes="cell_input" nb_element="cell_code_source">
-            <literal_block language="ipython3" linenos="False" xml:space="preserve">
+            <literal_block language="ipython3" linenos="0" xml:space="preserve">
                 import matplotlib.pyplot as plt
                 import pandas as pd
                 import sympy as sym
@@ -89,13 +89,13 @@
             Text Output
         <container cell_index="11" cell_metadata="{'ipub': {'text': {'format': {'backgroundcolor': '\\color{blue!10}'}}}}" classes="cell" exec_count="2" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     print("""
                     This is some printed text,
                     with a nicely formatted output.
                     """)
             <container classes="cell_output" nb_element="cell_code_output">
-                <literal_block classes="output stream" language="myst-ansi" linenos="False" xml:space="preserve">
+                <literal_block classes="output stream" language="myst-ansi" linenos="0" xml:space="preserve">
                     
                     This is some printed text,
                     with a nicely formatted output.
@@ -105,7 +105,7 @@
             Images and Figures
         <container cell_index="13" cell_metadata="{'ipub': {'figure': {'caption': 'A nice picture.', 'label': 'fig:example', 'placement': '!bh'}}}" classes="cell" exec_count="3" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     Image("example.jpg", height=400)
             <container classes="cell_output" nb_element="cell_code_output">
                 <image candidates="{'*': '_build/jupyter_execute/a4c9580c74dacf6f3316a3bd2e2a347933aa4463834dcf1bb8f20b4fcb476ae1.jpg'}" height="400" uri="_build/jupyter_execute/a4c9580c74dacf6f3316a3bd2e2a347933aa4463834dcf1bb8f20b4fcb476ae1.jpg">
@@ -118,7 +118,7 @@
                 The plotting code for a matplotlib figure (\cref{fig:example_mpl}).
             <container cell_index="17" cell_metadata="{'ipub': {'code': {'asfloat': True, 'caption': 'a', 'label': 'code:example_mpl', 'widefigure': False}, 'figure': {'caption': '', 'label': 'fig:example_mpl', 'widefigure': False}}}" classes="cell" exec_count="4" nb_element="cell_code">
                 <container classes="cell_input" nb_element="cell_code_source">
-                    <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                    <literal_block language="ipython3" linenos="0" xml:space="preserve">
                         plt.scatter(np.random.rand(10), np.random.rand(10), label="data label")
                         plt.ylabel(r"a y label with latex $\alpha$")
                         plt.legend();
@@ -131,14 +131,14 @@
             The plotting code for a pandas Dataframe table (\cref{tbl:example}).
         <container cell_index="20" cell_metadata="{'ipub': {'code': {'asfloat': True, 'caption': '', 'label': 'code:example_pd', 'placement': 'H', 'widefigure': False}, 'table': {'alternate': 'gray!20', 'caption': 'An example of a table created with pandas dataframe.', 'label': 'tbl:example', 'placement': 'H'}}}" classes="cell" exec_count="5" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     df = pd.DataFrame(np.random.rand(3, 4), columns=["a", "b", "c", "d"])
                     df.a = [r"$\delta$", "x", "y"]
                     df.b = ["l", "m", "n"]
                     df.set_index(["a", "b"])
                     df.round(3)
             <container classes="cell_output" nb_element="cell_code_output">
-                <math_block classes="output text_latex" nowrap="False" number="True" xml:space="preserve">
+                <math_block classes="output text_latex" nowrap="0" number="True" xml:space="preserve">
                     \begin{tabular}{lllrr}
                     \toprule
                     {} &         a &  b &      c &      d \\
@@ -153,16 +153,16 @@
             Equations (with ipython or sympy)
         <container cell_index="22" cell_metadata="{'ipub': {'equation': {'label': 'eqn:example_ipy'}}}" classes="cell" exec_count="6" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     Latex("$$ a = b+c $$")
             <container classes="cell_output" nb_element="cell_code_output">
-                <math_block classes="output text_latex" nowrap="False" number="True" xml:space="preserve">
+                <math_block classes="output text_latex" nowrap="0" number="True" xml:space="preserve">
                      a = b+c 
         <paragraph>
             The plotting code for a sympy equation (=@eqn:example_sympy).
         <container cell_index="24" cell_metadata="{'ipub': {'code': {'asfloat': True, 'caption': '', 'label': 'code:example_sym', 'placement': 'H', 'widefigure': False}, 'equation': {'environment': 'equation', 'label': 'eqn:example_sympy'}}}" classes="cell" exec_count="7" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     y = sym.Function("y")
                     n = sym.symbols(r"\alpha")
                     f = y(n) - 2 * y(n - 1 / sym.pi) - 5 * y(n - 2)
@@ -171,7 +171,7 @@
                 <image candidates="{'*': '_build/jupyter_execute/8c43e5c8cccf697754876b7fec1b0a9b731d7900bb585e775a5fa326b4de8c5a.png'}" uri="_build/jupyter_execute/8c43e5c8cccf697754876b7fec1b0a9b731d7900bb585e775a5fa326b4de8c5a.png">
         <container cell_index="25" cell_metadata="{}" classes="cell" exec_count="7" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     from IPython.display import display, Markdown
                     
                     display(Markdown("**_some_ markdown**"))
diff --git a/tests/test_render_outputs/test_hide_cell_content.xml b/tests/test_render_outputs/test_hide_cell_content.xml
index 66359142..4cd19273 100644
--- a/tests/test_render_outputs/test_hide_cell_content.xml
+++ b/tests/test_render_outputs/test_hide_cell_content.xml
@@ -5,32 +5,32 @@
         <container cell_index="1" cell_metadata="{'tags': ['hide-input']}" classes="cell tag_hide-input" exec_count="1" hide_mode="input" nb_element="cell_code" prompt_hide="Hide code cell {type}" prompt_show="Show code cell {type}">
             <HideCodeCellNode classes="above-input" prompt_hide="Hide code cell source" prompt_show="Show code cell source">
                 <container classes="cell_input" nb_element="cell_code_source">
-                    <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                    <literal_block language="ipython3" linenos="0" xml:space="preserve">
                         print("hide-input")
             <container classes="cell_output" nb_element="cell_code_output">
-                <literal_block classes="output stream" language="myst-ansi" linenos="False" xml:space="preserve">
+                <literal_block classes="output stream" language="myst-ansi" linenos="0" xml:space="preserve">
                     hide-input
         <container cell_index="2" cell_metadata="{'tags': ['hide-output']}" classes="cell tag_hide-output" exec_count="2" hide_mode="output" nb_element="cell_code" prompt_hide="Hide code cell {type}" prompt_show="Show code cell {type}">
             <container classes="cell_input above-output-prompt" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     print("hide-output")
             <HideCodeCellNode classes="below-input" prompt_hide="Hide code cell output" prompt_show="Show code cell output">
                 <container classes="cell_output" nb_element="cell_code_output">
-                    <literal_block classes="output stream" language="myst-ansi" linenos="False" xml:space="preserve">
+                    <literal_block classes="output stream" language="myst-ansi" linenos="0" xml:space="preserve">
                         hide-output
         <container cell_index="3" cell_metadata="{'tags': ['hide-cell']}" classes="cell tag_hide-cell" exec_count="4" hide_mode="all" nb_element="cell_code" prompt_hide="Hide code cell {type}" prompt_show="Show code cell {type}">
             <HideCodeCellNode classes="above-input" prompt_hide="Hide code cell content" prompt_show="Show code cell content">
                 <container classes="cell_input" nb_element="cell_code_source">
-                    <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                    <literal_block language="ipython3" linenos="0" xml:space="preserve">
                         print("hide-cell")
                 <container classes="cell_output" nb_element="cell_code_output">
-                    <literal_block classes="output stream" language="myst-ansi" linenos="False" xml:space="preserve">
+                    <literal_block classes="output stream" language="myst-ansi" linenos="0" xml:space="preserve">
                         hide-cell
         <container cell_index="4" cell_metadata="{'tags': ['hide-cell'], 'mystnb': {'code_prompt_show': 'My show message', 'code_prompt_hide': 'My hide message'}}" classes="cell tag_hide-cell" exec_count="5" hide_mode="all" nb_element="cell_code" prompt_hide="My hide message" prompt_show="My show message">
             <HideCodeCellNode classes="above-input" prompt_hide="My hide message" prompt_show="My show message">
                 <container classes="cell_input" nb_element="cell_code_source">
-                    <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                    <literal_block language="ipython3" linenos="0" xml:space="preserve">
                         print("hide-cell custom message")
                 <container classes="cell_output" nb_element="cell_code_output">
-                    <literal_block classes="output stream" language="myst-ansi" linenos="False" xml:space="preserve">
+                    <literal_block classes="output stream" language="myst-ansi" linenos="0" xml:space="preserve">
                         hide-cell custom message
diff --git a/tests/test_render_outputs/test_merge_streams.xml b/tests/test_render_outputs/test_merge_streams.xml
index d944e436..f0399b4f 100644
--- a/tests/test_render_outputs/test_merge_streams.xml
+++ b/tests/test_render_outputs/test_merge_streams.xml
@@ -1,7 +1,7 @@
 <document source="merge_streams">
     <container cell_index="0" cell_metadata="{}" classes="cell" exec_count="1" nb_element="cell_code">
         <container classes="cell_input" nb_element="cell_code_source">
-            <literal_block language="ipython3" linenos="False" xml:space="preserve">
+            <literal_block language="ipython3" linenos="0" xml:space="preserve">
                 import sys
                 
                 print("stdout1", file=sys.stdout)
@@ -12,13 +12,13 @@
                 print("stderr3", file=sys.stderr)
                 1
         <container classes="cell_output" nb_element="cell_code_output">
-            <literal_block classes="output stream" language="myst-ansi" linenos="False" xml:space="preserve">
+            <literal_block classes="output stream" language="myst-ansi" linenos="0" xml:space="preserve">
                 stdout1
                 stdout2
                 stdout3
-            <literal_block classes="output stderr" language="myst-ansi" linenos="False" xml:space="preserve">
+            <literal_block classes="output stderr" language="myst-ansi" linenos="0" xml:space="preserve">
                 stderr1
                 stderr2
                 stderr3
-            <literal_block classes="output text_plain" language="myst-ansi" linenos="False" xml:space="preserve">
+            <literal_block classes="output text_plain" language="myst-ansi" linenos="0" xml:space="preserve">
                 1
diff --git a/tests/test_render_outputs/test_merge_streams_parallel.xml b/tests/test_render_outputs/test_merge_streams_parallel.xml
index 17254962..1bb52cfe 100644
--- a/tests/test_render_outputs/test_merge_streams_parallel.xml
+++ b/tests/test_render_outputs/test_merge_streams_parallel.xml
@@ -1,14 +1,14 @@
 <document source="merge_streams_parallel">
     <container cell_index="0" cell_metadata="{'execution': {'iopub.execute_input': '2024-09-19T21:44:29.809012Z', 'iopub.status.busy': '2024-09-19T21:44:29.808809Z', 'iopub.status.idle': '2024-09-19T21:44:29.978481Z', 'shell.execute_reply': '2024-09-19T21:44:29.977891Z'}}" classes="cell" exec_count="1" nb_element="cell_code">
         <container classes="cell_input" nb_element="cell_code_source">
-            <literal_block language="ipython3" linenos="False" xml:space="preserve">
+            <literal_block language="ipython3" linenos="0" xml:space="preserve">
                 from concurrent.futures import ProcessPoolExecutor
                 
                 with ProcessPoolExecutor() as executor:
                     for i in executor.map(print, [0] * 10):
                         pass
         <container classes="cell_output" nb_element="cell_code_output">
-            <literal_block classes="output stream" language="myst-ansi" linenos="False" xml:space="preserve">
+            <literal_block classes="output stream" language="myst-ansi" linenos="0" xml:space="preserve">
                 0
                 0
                 0
diff --git a/tests/test_render_outputs/test_metadata_figure.xml b/tests/test_render_outputs/test_metadata_figure.xml
index 1ae8143d..74f40129 100644
--- a/tests/test_render_outputs/test_metadata_figure.xml
+++ b/tests/test_render_outputs/test_metadata_figure.xml
@@ -4,7 +4,7 @@
             Formatting code outputs
         <container cell_index="1" cell_metadata="{'myst': {'figure': {'caption': 'Hey everyone its **party** time!\n', 'name': 'fun-fish'}}}" classes="cell" exec_count="1" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     from IPython.display import Image
                     
                     Image("fun-fish.png")
@@ -18,6 +18,6 @@
                          time!
         <paragraph>
             Link: 
-            <reference internal="True" refid="fun-fish">
+            <reference internal="1" refid="fun-fish">
                 <inline classes="std std-ref">
                     swim to the fish
diff --git a/tests/test_render_outputs/test_metadata_image.xml b/tests/test_render_outputs/test_metadata_image.xml
index 33d586e3..1b773bae 100644
--- a/tests/test_render_outputs/test_metadata_image.xml
+++ b/tests/test_render_outputs/test_metadata_image.xml
@@ -4,7 +4,7 @@
             Formatting code outputs
         <container cell_index="1" cell_metadata="{'myst': {'image': {'alt': 'fun-fish', 'classes': 'shadow bg-primary', 'width': '300px'}}}" classes="cell" exec_count="1" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     from IPython.display import Image
                     
                     Image("fun-fish.png")
diff --git a/tests/test_render_outputs/test_metadata_image_output.xml b/tests/test_render_outputs/test_metadata_image_output.xml
index bd398e43..d4e70ba7 100644
--- a/tests/test_render_outputs/test_metadata_image_output.xml
+++ b/tests/test_render_outputs/test_metadata_image_output.xml
@@ -4,7 +4,7 @@
             Output metadata
         <container cell_index="1" cell_metadata="{'tags': ['skip-execution']}" classes="cell tag_skip-execution" exec_count="1" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     # Outputs included with width/height in output metadata,
                     # cell is not executed
                     from IPython.display import Image
@@ -14,7 +14,7 @@
                 <image candidates="{'*': '_build/jupyter_execute/a4c9580c74dacf6f3316a3bd2e2a347933aa4463834dcf1bb8f20b4fcb476ae1.jpg'}" height="100" uri="_build/jupyter_execute/a4c9580c74dacf6f3316a3bd2e2a347933aa4463834dcf1bb8f20b4fcb476ae1.jpg" width="500">
         <container cell_index="2" cell_metadata="{}" classes="cell" exec_count="1" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     # No outputs, cell is executed, image should have original size (370, 254)
                     from IPython.display import Image
                     
diff --git a/tests/test_render_outputs/test_metadata_multiple_image.xml b/tests/test_render_outputs/test_metadata_multiple_image.xml
index 2c569e33..a25fb40d 100644
--- a/tests/test_render_outputs/test_metadata_multiple_image.xml
+++ b/tests/test_render_outputs/test_metadata_multiple_image.xml
@@ -6,7 +6,7 @@
             This is a test case with multiple captioned and labelled images
         <container cell_index="1" cell_metadata="{'myst': {'figure': {'caption': 'Hey everyone its **party** time!\n', 'name': 'fun-fish'}, 'image': {'alt': 'fun-fish', 'classes': 'shadow bg-primary', 'width': '300px'}}}" classes="cell" exec_count="1" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     from IPython.display import Image
                     
                     Image("fun-fish.png")
@@ -20,14 +20,14 @@
                          time!
         <paragraph>
             Link: 
-            <reference internal="True" refid="fun-fish">
+            <reference internal="1" refid="fun-fish">
                 <inline classes="std std-ref">
                     swim to the fish
         <paragraph>
             Adding another party fish image to test for multiple images
         <container cell_index="4" cell_metadata="{'myst': {'figure': {'caption': 'Hey everyone its **party** time again!\n', 'name': 'fun-fish2'}, 'image': {'alt': 'fun-fish2', 'classes': 'shadow bg-primary', 'width': '200px'}}}" classes="cell" exec_count="2" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     from IPython.display import Image
                     
                     Image("fun-fish.png")
@@ -41,11 +41,11 @@
                          time again!
         <paragraph>
             Link: 
-            <reference internal="True" refid="fun-fish">
+            <reference internal="1" refid="fun-fish">
                 <inline classes="std std-ref">
                     swim to the fish
         <paragraph>
             Link: 
-            <reference internal="True" refid="fun-fish2">
+            <reference internal="1" refid="fun-fish2">
                 <inline classes="std std-ref">
                     swim to the fish again
diff --git a/tests/test_render_outputs/test_scroll_outputs.xml b/tests/test_render_outputs/test_scroll_outputs.xml
index 99d19a0c..6d8969f4 100644
--- a/tests/test_render_outputs/test_scroll_outputs.xml
+++ b/tests/test_render_outputs/test_scroll_outputs.xml
@@ -4,20 +4,20 @@
             Scroll long outputs
         <container cell_index="1" cell_metadata="{}" classes="cell config_scroll_outputs" exec_count="2" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     for i in range(2):
                         print("short output")
             <container classes="cell_output" nb_element="cell_code_output">
-                <literal_block classes="output stream" language="myst-ansi" linenos="False" xml:space="preserve">
+                <literal_block classes="output stream" language="myst-ansi" linenos="0" xml:space="preserve">
                     short output
                     short output
         <container cell_index="2" cell_metadata="{}" classes="cell config_scroll_outputs" exec_count="1" nb_element="cell_code">
             <container classes="cell_input" nb_element="cell_code_source">
-                <literal_block language="ipython3" linenos="False" xml:space="preserve">
+                <literal_block language="ipython3" linenos="0" xml:space="preserve">
                     for i in range(100):
                         print("long output")
             <container classes="cell_output" nb_element="cell_code_output">
-                <literal_block classes="output stream" language="myst-ansi" linenos="False" xml:space="preserve">
+                <literal_block classes="output stream" language="myst-ansi" linenos="0" xml:space="preserve">
                     long output
                     long output
                     long output
diff --git a/tests/test_render_outputs/test_stderr_remove.xml b/tests/test_render_outputs/test_stderr_remove.xml
index 0ade48ad..f7eeefac 100644
--- a/tests/test_render_outputs/test_stderr_remove.xml
+++ b/tests/test_render_outputs/test_stderr_remove.xml
@@ -1,14 +1,14 @@
 <document source="basic_stderr">
     <container cell_index="0" cell_metadata="{}" classes="cell" exec_count="1" nb_element="cell_code">
         <container classes="cell_input" nb_element="cell_code_source">
-            <literal_block language="ipython3" linenos="False" xml:space="preserve">
+            <literal_block language="ipython3" linenos="0" xml:space="preserve">
                 import sys
                 
                 print("hallo", file=sys.stderr)
         <container classes="cell_output" nb_element="cell_code_output">
     <container cell_index="1" cell_metadata="{'tags': ['remove-stderr']}" classes="cell tag_remove-stderr" exec_count="1" nb_element="cell_code">
         <container classes="cell_input" nb_element="cell_code_source">
-            <literal_block language="ipython3" linenos="False" xml:space="preserve">
+            <literal_block language="ipython3" linenos="0" xml:space="preserve">
                 import sys
                 
                 print("hallo", file=sys.stderr)
diff --git a/tests/test_render_outputs/test_stderr_tag.xml b/tests/test_render_outputs/test_stderr_tag.xml
index 923ae5c4..0ed540bf 100644
--- a/tests/test_render_outputs/test_stderr_tag.xml
+++ b/tests/test_render_outputs/test_stderr_tag.xml
@@ -1,16 +1,16 @@
 <document source="basic_stderr">
     <container cell_index="0" cell_metadata="{}" classes="cell" exec_count="1" nb_element="cell_code">
         <container classes="cell_input" nb_element="cell_code_source">
-            <literal_block language="ipython3" linenos="False" xml:space="preserve">
+            <literal_block language="ipython3" linenos="0" xml:space="preserve">
                 import sys
                 
                 print("hallo", file=sys.stderr)
         <container classes="cell_output" nb_element="cell_code_output">
-            <literal_block classes="output stderr" language="myst-ansi" linenos="False" xml:space="preserve">
+            <literal_block classes="output stderr" language="myst-ansi" linenos="0" xml:space="preserve">
                 hallo
     <container cell_index="1" cell_metadata="{'tags': ['remove-stderr']}" classes="cell tag_remove-stderr" exec_count="1" nb_element="cell_code">
         <container classes="cell_input" nb_element="cell_code_source">
-            <literal_block language="ipython3" linenos="False" xml:space="preserve">
+            <literal_block language="ipython3" linenos="0" xml:space="preserve">
                 import sys
                 
                 print("hallo", file=sys.stderr)
diff --git a/tests/test_render_outputs/test_unknown_mimetype.xml b/tests/test_render_outputs/test_unknown_mimetype.xml
index 61d59ff2..06837614 100644
--- a/tests/test_render_outputs/test_unknown_mimetype.xml
+++ b/tests/test_render_outputs/test_unknown_mimetype.xml
@@ -1,7 +1,7 @@
 <document source="unknown_mimetype">
     <container cell_index="0" cell_metadata="{}" classes="cell" exec_count="1" nb_element="cell_code">
         <container classes="cell_input" nb_element="cell_code_source">
-            <literal_block language="ipython3" linenos="False" xml:space="preserve">
+            <literal_block language="ipython3" linenos="0" xml:space="preserve">
                 a = 1
                 print(a)
         <container classes="cell_output" nb_element="cell_code_output">
diff --git a/tox.ini b/tox.ini
index 42d442e8..f276f897 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,7 +16,7 @@ envlist = py313-sphinx8
 [testenv]
 usedevelop = true
 
-[testenv:py{310,311,312,313}-sphinx{5,6,7,8}]
+[testenv:py{310,311,312,313,314}-sphinx{5,6,7,8}]
 extras = testing
 deps =
     sphinx5: sphinx>=5,<6