diff --git a/appengine/rails-cloudsql-mysql/Gemfile b/appengine/rails-cloudsql-mysql/Gemfile
index a0586e4d2..e37ef53dc 100644
--- a/appengine/rails-cloudsql-mysql/Gemfile
+++ b/appengine/rails-cloudsql-mysql/Gemfile
@@ -64,3 +64,5 @@ gem "tzinfo-data", platforms: [:mingw, :mswin, :x64_mingw, :jruby]
 gem "appengine", "~> 0.7"
 gem "mysql2", "~> 0.5.5"
 # [END gems]
+
+gem "ostruct"
diff --git a/appengine/rails-cloudsql-mysql/Gemfile.lock b/appengine/rails-cloudsql-mysql/Gemfile.lock
index 1d68e8fe8..a40659b94 100644
--- a/appengine/rails-cloudsql-mysql/Gemfile.lock
+++ b/appengine/rails-cloudsql-mysql/Gemfile.lock
@@ -227,6 +227,7 @@ GEM
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     os (1.1.4)
+    ostruct (0.6.3)
     psych (5.1.2)
       stringio
     public_suffix (5.0.3)
@@ -364,6 +365,7 @@ DEPENDENCIES
   jbuilder (~> 2.11)
   listen (~> 3.8)
   mysql2 (~> 0.5.5)
+  ostruct
   puma (~> 6.3)
   rails (~> 7.0)
   rails-controller-testing
diff --git a/appengine/rails-cloudsql-mysql/app.yaml b/appengine/rails-cloudsql-mysql/app.yaml
index 56879ad60..dee928f50 100644
--- a/appengine/rails-cloudsql-mysql/app.yaml
+++ b/appengine/rails-cloudsql-mysql/app.yaml
@@ -18,6 +18,8 @@
 entrypoint: bundle exec rackup --port $PORT
 env: flex
 runtime: ruby
+runtime_config:
+  operating_system: "ubuntu22"
 # [END step_1]
 
 env_variables:
diff --git a/appengine/rails-cloudsql-postgres/Gemfile b/appengine/rails-cloudsql-postgres/Gemfile
index 67abc5919..ff4b2641c 100644
--- a/appengine/rails-cloudsql-postgres/Gemfile
+++ b/appengine/rails-cloudsql-postgres/Gemfile
@@ -64,3 +64,5 @@ gem "tzinfo-data", platforms: [:mingw, :mswin, :x64_mingw, :jruby]
 gem "appengine", "~> 0.7"
 gem "pg", "~> 1.5"
 # [END gems]
+
+gem "ostruct"
diff --git a/appengine/rails-cloudsql-postgres/Gemfile.lock b/appengine/rails-cloudsql-postgres/Gemfile.lock
index 66856ecc5..71b56b1df 100644
--- a/appengine/rails-cloudsql-postgres/Gemfile.lock
+++ b/appengine/rails-cloudsql-postgres/Gemfile.lock
@@ -229,6 +229,7 @@ GEM
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     os (1.1.4)
+    ostruct (0.6.3)
     pg (1.5.3)
     pp (0.6.2)
       prettyprint
@@ -371,6 +372,7 @@ DEPENDENCIES
   cuprite
   jbuilder (~> 2.11)
   listen (~> 3.8)
+  ostruct
   pg (~> 1.5)
   puma (~> 6.4)
   rails (~> 7.0)
diff --git a/appengine/rails-cloudsql-postgres/app.yaml b/appengine/rails-cloudsql-postgres/app.yaml
index 56879ad60..dee928f50 100644
--- a/appengine/rails-cloudsql-postgres/app.yaml
+++ b/appengine/rails-cloudsql-postgres/app.yaml
@@ -18,6 +18,8 @@
 entrypoint: bundle exec rackup --port $PORT
 env: flex
 runtime: ruby
+runtime_config:
+  operating_system: "ubuntu22"
 # [END step_1]
 
 env_variables: