diff --git a/requirements.txt b/requirements.txt
index b311ef7..e7f9f28 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -61,4 +61,3 @@ wslink==1.12.4
 yarl>=1
     # via aiohttp
 
-opengeodeweb-microservice==1.*,>=1.0.15
diff --git a/src/opengeodeweb_viewer/vtk_protocol.py b/src/opengeodeweb_viewer/vtk_protocol.py
index 437e5fc..7968afe 100644
--- a/src/opengeodeweb_viewer/vtk_protocol.py
+++ b/src/opengeodeweb_viewer/vtk_protocol.py
@@ -24,14 +24,15 @@
 # Local application imports
 from opengeodeweb_microservice.database.connection import get_session
 from opengeodeweb_microservice.database.data import Data
+from opengeodeweb_microservice.database.data_types import ViewerType, ViewerElementsType
 
 
 @dataclass
 class ViewerData:
     id: str
     viewable_file: str | None
-    viewer_object: str
-    viewer_elements_type: str
+    viewer_object: ViewerType
+    viewer_elements_type: ViewerElementsType
 
 
 @dataclass