diff --git a/.toys/kokoro-ci.rb b/.toys/kokoro-ci.rb
index 7659846b6..73ca73502 100644
--- a/.toys/kokoro-ci.rb
+++ b/.toys/kokoro-ci.rb
@@ -148,17 +148,27 @@ def list_products
 # Filter out products whose tests will not run on the current Ruby version
 #
 def filter_by_ruby_versions
+  rails_cloudsql = [
+    "appengine/rails-cloudsql-postgres",
+    "appengine/rails-cloudsql-mysql"
+  ]
+
   unless newest_ruby?
     # Spanner tests are too slow. Run only on newest.
     @products.delete "spanner"
     # run/rails uses Rails 7 and requires newest Ruby.
     @products.delete "run/rails"
+    # Rails 7 cloud-sql samples require Ruby 3.2+, so run only on newest.
+    @products.delete_if { |dir| rails_cloudsql.include? dir }
   end
   if newest_ruby?
     # getting-started uses an old Rails and is incompatible with newest.
     @products.delete_if { |dir| dir.start_with? "getting-started/" }
-    # appengine tests are slow and some use an old Rails. Run only on oldest.
-    @products.delete_if { |dir| dir.start_with? "appengine/" }
+    # appengine tests are slow and some use an old Rails. Run only on oldest,
+    # except for rails-cloudsql which require newest Ruby because they use Rails 7.
+    @products.delete_if do |dir|
+      dir.start_with?("appengine/") && !rails_cloudsql.include?(dir)
+    end
   end
 end
 
@@ -257,7 +267,7 @@ def install_gcloud_cli
   return if defined? @gcloud_cli_installed
   exec ["gcloud", "config", "set", "disable_prompts", "True"]
   exec ["gcloud", "config", "set", "project", assert_env("E2E_GOOGLE_CLOUD_PROJECT")]
-  exec ["gcloud", "config", "set", "app/promote_by_default",  "false"]
+  exec ["gcloud", "config", "set", "app/promote_by_default", "false"]
   exec ["gcloud", "auth", "activate-service-account", "--key-file", gac_path]
   exec ["gcloud", "info"]
   @gcloud_cli_installed = true
@@ -283,7 +293,7 @@ def test_globals
 # Run tests in the given directory.
 #
 def test_product dir
-  is_e2e = !presubmit? && newest_ruby? || dir.start_with?("run/") || dir.start_with?("appengine/")
+  is_e2e = (!presubmit? && newest_ruby?) || dir.start_with?("run/") || dir.start_with?("appengine/")
   ENV["E2E"] = is_e2e.to_s
   ENV["TEST_DIR"] = dir
   start_time = Time.now.to_i
@@ -319,7 +329,7 @@ def test_rspec dir
 #
 def test_minitest dir
   test_exec "MINITEST:#{dir}" do
-    test_files = Dir.glob("test/**/*_test.rb")
+    test_files = Dir.glob "test/**/*_test.rb"
     args = ["-Itest", "-w"]
     args += ["-", "--junit", "--junit-filename=sponge_log.xml"] unless presubmit?
     exec_ruby args, in: :controller do |controller|
@@ -339,7 +349,7 @@ def test_exec name, command = nil
   puts "**** RUNNING: #{name} ...", :cyan, :bold
   result =
     if command
-      exec(command)
+      exec command
     elsif block_given?
       yield
     end
@@ -371,7 +381,8 @@ def gac_path
 
 def presubmit?
   unless defined? @is_presubmit
-    @is_presubmit = (/system-tests/ =~ assert_env("KOKORO_BUILD_ARTIFACTS_SUBDIR")).nil?
+    dir = assert_env "KOKORO_BUILD_ARTIFACTS_SUBDIR"
+    @is_presubmit = (/system-tests/ =~ dir).nil?
   end
   @is_presubmit
 end
diff --git a/appengine/rails-cloudsql-mysql/Gemfile b/appengine/rails-cloudsql-mysql/Gemfile
index a0586e4d2..7f69b9114 100644
--- a/appengine/rails-cloudsql-mysql/Gemfile
+++ b/appengine/rails-cloudsql-mysql/Gemfile
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 source "https://rubygems.org"
+ruby ">= 3.2.0"
 
 git_source :github do |repo_name|
   repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include? "/"
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..10f93103f 100644
--- a/appengine/rails-cloudsql-postgres/Gemfile
+++ b/appengine/rails-cloudsql-postgres/Gemfile
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 source "https://rubygems.org"
+ruby ">= 3.2.0"
 
 git_source :github do |repo_name|
   repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include? "/"
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: