diff --git a/examples/rails_app/Gemfile.lock b/examples/rails_app/Gemfile.lock
index 984cd5b..9cc225b 100644
--- a/examples/rails_app/Gemfile.lock
+++ b/examples/rails_app/Gemfile.lock
@@ -103,11 +103,11 @@ GEM
     mini_portile2 (2.4.0)
     minitest (5.11.3)
     multi_json (1.13.1)
-    nio4r (2.3.1)
+    nio4r (2.5.8)
     nokogiri (1.10.10)
       mini_portile2 (~> 2.4.0)
     public_suffix (4.0.6)
-    puma (4.3.11)
+    puma (4.3.12)
       nio4r (~> 2.0)
     rack (2.2.3)
     rack-test (1.1.0)