diff --git a/.toys/kokoro-ci.rb b/.toys/kokoro-ci.rb
index 7659846b6..e3bdfd031 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 -= rails_cloudsql
   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..8aa319469 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? "/"
@@ -63,4 +64,5 @@ gem "tzinfo-data", platforms: [:mingw, :mswin, :x64_mingw, :jruby]
 # [START gems]
 gem "appengine", "~> 0.7"
 gem "mysql2", "~> 0.5.5"
+gem "ostruct"
 # [END gems]
diff --git a/appengine/rails-cloudsql-mysql/Gemfile.lock b/appengine/rails-cloudsql-mysql/Gemfile.lock
index 1d68e8fe8..e1f216f45 100644
--- a/appengine/rails-cloudsql-mysql/Gemfile.lock
+++ b/appengine/rails-cloudsql-mysql/Gemfile.lock
@@ -223,10 +223,10 @@ GEM
     net-smtp (0.3.3)
       net-protocol
     nio4r (2.5.9)
-    nokogiri (1.18.9)
-      mini_portile2 (~> 2.8.2)
+    nokogiri (1.18.9-arm64-darwin)
       racc (~> 1.4)
     os (1.1.4)
+    ostruct (0.6.3)
     psych (5.1.2)
       stringio
     public_suffix (5.0.3)
@@ -354,7 +354,7 @@ GEM
     zeitwerk (2.6.11)
 
 PLATFORMS
-  ruby
+  arm64-darwin-24
 
 DEPENDENCIES
   appengine (~> 0.7)
@@ -364,6 +364,7 @@ DEPENDENCIES
   jbuilder (~> 2.11)
   listen (~> 3.8)
   mysql2 (~> 0.5.5)
+  ostruct
   puma (~> 6.3)
   rails (~> 7.0)
   rails-controller-testing
@@ -374,5 +375,8 @@ DEPENDENCIES
   tzinfo-data
   web-console (>= 4.2.0)
 
+RUBY VERSION
+   ruby 3.4.5p51
+
 BUNDLED WITH
    2.4.19
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..ac128a390 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? "/"
@@ -63,4 +64,5 @@ gem "tzinfo-data", platforms: [:mingw, :mswin, :x64_mingw, :jruby]
 # [START gems]
 gem "appengine", "~> 0.7"
 gem "pg", "~> 1.5"
+gem "ostruct"
 # [END gems]
diff --git a/appengine/rails-cloudsql-postgres/Gemfile.lock b/appengine/rails-cloudsql-postgres/Gemfile.lock
index 56bcb2933..ee1d60afd 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
@@ -362,7 +363,7 @@ GEM
     zeitwerk (2.6.13)
 
 PLATFORMS
-  ruby
+  arm64-darwin-24
 
 DEPENDENCIES
   appengine (~> 0.7)
@@ -371,6 +372,7 @@ DEPENDENCIES
   cuprite
   jbuilder (~> 2.11)
   listen (~> 3.8)
+  ostruct
   pg (~> 1.5)
   puma (~> 6.4)
   rails (~> 7.0)
@@ -382,5 +384,8 @@ DEPENDENCIES
   tzinfo-data
   web-console (>= 4.2.0)
 
+RUBY VERSION
+   ruby 3.4.5p51
+
 BUNDLED WITH
    2.4.19
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:
diff --git a/functions/Gemfile b/functions/Gemfile
index 9a0889b55..433cfcb8e 100644
--- a/functions/Gemfile
+++ b/functions/Gemfile
@@ -15,6 +15,7 @@
 source "https://rubygems.org"
 
 gem "functions_framework", "~> 1.4", ">= 1.4.1"
+gem "ostruct"
 
 group "test" do
   gem "google-apis-kgsearch_v1", "~> 0.13"
diff --git a/functions/Gemfile.lock b/functions/Gemfile.lock
index e6a425349..d90f90746 100644
--- a/functions/Gemfile.lock
+++ b/functions/Gemfile.lock
@@ -125,6 +125,7 @@ GEM
     multipart-post (2.3.0)
     nio4r (2.7.0)
     os (1.1.4)
+    ostruct (0.6.3)
     public_suffix (5.0.3)
     puma (6.4.2)
       nio4r (~> 2.0)
@@ -167,8 +168,9 @@ DEPENDENCIES
   minitest (~> 5.20)
   minitest-focus (~> 1.4)
   minitest-junit (~> 1.1)
+  ostruct
   rake (>= 13.0)
   slack-ruby-client (>= 2.0, < 3)
 
 BUNDLED WITH
-   2.4.10
+  4.0.10
diff --git a/run/helloworld/Gemfile b/run/helloworld/Gemfile
index 3622c7a06..ec67db306 100644
--- a/run/helloworld/Gemfile
+++ b/run/helloworld/Gemfile
@@ -14,3 +14,4 @@ end
 
 gem "puma", "~> 6.6"
 gem "rackup", "~> 1.0"
+gem "ostruct"
diff --git a/run/helloworld/Gemfile.lock b/run/helloworld/Gemfile.lock
index 4068f7e96..3388df991 100644
--- a/run/helloworld/Gemfile.lock
+++ b/run/helloworld/Gemfile.lock
@@ -16,6 +16,7 @@ GEM
       ruby2_keywords (~> 0.0.1)
     netrc (0.11.0)
     nio4r (2.7.4)
+    ostruct (0.6.3)
     puma (6.6.0)
       nio4r (~> 2.0)
     rack (2.2.8.1)
@@ -69,6 +70,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  ostruct
   puma (~> 6.6)
   rack-test
   rackup (~> 1.0)
@@ -81,4 +83,4 @@ DEPENDENCIES
   thin
 
 BUNDLED WITH
-   2.6.6
+  4.0.10