diff --git a/Library/Homebrew/test/bash_spec.rb b/Library/Homebrew/test/bash_spec.rb
index 18194f8c6a..6ecd34b4d1 100644
--- a/Library/Homebrew/test/bash_spec.rb
+++ b/Library/Homebrew/test/bash_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: true
 # frozen_string_literal: true
 
 require "open3"
diff --git a/Library/Homebrew/test/bundle_version_spec.rb b/Library/Homebrew/test/bundle_version_spec.rb
index 62723dd91b..b8d9bdbefe 100644
--- a/Library/Homebrew/test/bundle_version_spec.rb
+++ b/Library/Homebrew/test/bundle_version_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: strict
 # frozen_string_literal: true
 
 require "bundle_version"
diff --git a/Library/Homebrew/test/cask/artifact/binary_spec.rb b/Library/Homebrew/test/cask/artifact/binary_spec.rb
index c37ce088ac..88428a7db5 100644
--- a/Library/Homebrew/test/cask/artifact/binary_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/binary_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: true
 # frozen_string_literal: true
 
 RSpec.describe Cask::Artifact::Binary, :cask do
diff --git a/Library/Homebrew/test/cask/artifact/symlinked_spec.rb b/Library/Homebrew/test/cask/artifact/symlinked_spec.rb
index 57499bd068..8ed13afc5e 100644
--- a/Library/Homebrew/test/cask/artifact/symlinked_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/symlinked_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: true
 # frozen_string_literal: true
 
 RSpec.describe Cask::Artifact::Symlinked, :cask do
diff --git a/Library/Homebrew/test/cask/denylist_spec.rb b/Library/Homebrew/test/cask/denylist_spec.rb
index f31f9b121f..b810d8d270 100644
--- a/Library/Homebrew/test/cask/denylist_spec.rb
+++ b/Library/Homebrew/test/cask/denylist_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: strict
 # frozen_string_literal: true
 
 require "cask/denylist"
diff --git a/Library/Homebrew/test/cask/dsl/postflight_spec.rb b/Library/Homebrew/test/cask/dsl/postflight_spec.rb
index c4b092273f..7d5c62f7e4 100644
--- a/Library/Homebrew/test/cask/dsl/postflight_spec.rb
+++ b/Library/Homebrew/test/cask/dsl/postflight_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: true
 # frozen_string_literal: true
 
 require "test/cask/dsl/shared_examples/base"
diff --git a/Library/Homebrew/test/cask/dsl/preflight_spec.rb b/Library/Homebrew/test/cask/dsl/preflight_spec.rb
index 17abbf180b..adcac6fe70 100644
--- a/Library/Homebrew/test/cask/dsl/preflight_spec.rb
+++ b/Library/Homebrew/test/cask/dsl/preflight_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: true
 # frozen_string_literal: true
 
 require "test/cask/dsl/shared_examples/base"
diff --git a/Library/Homebrew/test/cask/dsl/uninstall_preflight_spec.rb b/Library/Homebrew/test/cask/dsl/uninstall_preflight_spec.rb
index 03adc95b9d..440a24fe69 100644
--- a/Library/Homebrew/test/cask/dsl/uninstall_preflight_spec.rb
+++ b/Library/Homebrew/test/cask/dsl/uninstall_preflight_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: true
 # frozen_string_literal: true
 
 require "test/cask/dsl/shared_examples/base"
diff --git a/Library/Homebrew/test/cask/utils/trash_spec.rb b/Library/Homebrew/test/cask/utils/trash_spec.rb
index 898e230344..437374bf26 100644
--- a/Library/Homebrew/test/cask/utils/trash_spec.rb
+++ b/Library/Homebrew/test/cask/utils/trash_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: true
 # frozen_string_literal: true
 
 require "cask/utils/trash"
diff --git a/Library/Homebrew/test/checksum_verification_spec.rb b/Library/Homebrew/test/checksum_verification_spec.rb
index 53ac59d3a2..882b341bf6 100644
--- a/Library/Homebrew/test/checksum_verification_spec.rb
+++ b/Library/Homebrew/test/checksum_verification_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: true
 # frozen_string_literal: true
 
 require "formula"
diff --git a/Library/Homebrew/test/cleanup_spec.rb b/Library/Homebrew/test/cleanup_spec.rb
index 22f46e176f..cef0269521 100644
--- a/Library/Homebrew/test/cleanup_spec.rb
+++ b/Library/Homebrew/test/cleanup_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: true
 # frozen_string_literal: true
 
 require "test/support/fixtures/testball"
diff --git a/Library/Homebrew/test/cmd/vulns_spec.rb b/Library/Homebrew/test/cmd/vulns_spec.rb
index 4df4543411..46a99543cd 100644
--- a/Library/Homebrew/test/cmd/vulns_spec.rb
+++ b/Library/Homebrew/test/cmd/vulns_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: true
 # frozen_string_literal: true
 
 require "cmd/vulns"
diff --git a/Library/Homebrew/test/download_strategies/curl_spec.rb b/Library/Homebrew/test/download_strategies/curl_spec.rb
index 53e6dc982e..b2d739e114 100644
--- a/Library/Homebrew/test/download_strategies/curl_spec.rb
+++ b/Library/Homebrew/test/download_strategies/curl_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: true
 # frozen_string_literal: true
 
 require "download_strategy"
diff --git a/Library/Homebrew/test/formula_creator_spec.rb b/Library/Homebrew/test/formula_creator_spec.rb
index ec7143f12f..59c4d158ec 100644
--- a/Library/Homebrew/test/formula_creator_spec.rb
+++ b/Library/Homebrew/test/formula_creator_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: strict
 # frozen_string_literal: true
 
 require "formula_creator"
diff --git a/Library/Homebrew/test/formula_installer_bottle_spec.rb b/Library/Homebrew/test/formula_installer_bottle_spec.rb
index 05f9e71243..89dc4403b6 100644
--- a/Library/Homebrew/test/formula_installer_bottle_spec.rb
+++ b/Library/Homebrew/test/formula_installer_bottle_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: true
 # frozen_string_literal: true
 
 require "formula"
diff --git a/Library/Homebrew/test/install_steps_spec.rb b/Library/Homebrew/test/install_steps_spec.rb
index 94ec8add57..06659a2ad1 100644
--- a/Library/Homebrew/test/install_steps_spec.rb
+++ b/Library/Homebrew/test/install_steps_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: true
 # frozen_string_literal: true
 
 require "install_steps"
diff --git a/Library/Homebrew/test/language/python/virtualenv_spec.rb b/Library/Homebrew/test/language/python/virtualenv_spec.rb
index af9cabe6a8..2ef1f0b9b9 100644
--- a/Library/Homebrew/test/language/python/virtualenv_spec.rb
+++ b/Library/Homebrew/test/language/python/virtualenv_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: true
 # frozen_string_literal: true
 
 require "language/python"
diff --git a/Library/Homebrew/test/mcp_server_spec.rb b/Library/Homebrew/test/mcp_server_spec.rb
index 8158fba93b..f364d391ec 100644
--- a/Library/Homebrew/test/mcp_server_spec.rb
+++ b/Library/Homebrew/test/mcp_server_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: true
 # frozen_string_literal: true
 
 require "mcp_server"
diff --git a/Library/Homebrew/test/rubocops/presence_spec.rb b/Library/Homebrew/test/rubocops/presence_spec.rb
index 8224908a19..ba09dbd3c0 100644
--- a/Library/Homebrew/test/rubocops/presence_spec.rb
+++ b/Library/Homebrew/test/rubocops/presence_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: strict
 # frozen_string_literal: true
 
 require "rubocops/presence"
diff --git a/Library/Homebrew/test/sandbox_shared_spec.rb b/Library/Homebrew/test/sandbox_shared_spec.rb
index 05d8ceb76c..6a2a8be62f 100644
--- a/Library/Homebrew/test/sandbox_shared_spec.rb
+++ b/Library/Homebrew/test/sandbox_shared_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: true
 # frozen_string_literal: true
 
 require "sandbox"
diff --git a/Library/Homebrew/test/service_spec.rb b/Library/Homebrew/test/service_spec.rb
index 8305f9b19d..918ccdb8d2 100644
--- a/Library/Homebrew/test/service_spec.rb
+++ b/Library/Homebrew/test/service_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: true
 # frozen_string_literal: true
 
 require "formula"
diff --git a/Library/Homebrew/test/support/fixtures/formulae/install-steps.rb b/Library/Homebrew/test/support/fixtures/formulae/install-steps.rb
index c49c61f18f..746c3a8b2e 100644
--- a/Library/Homebrew/test/support/fixtures/formulae/install-steps.rb
+++ b/Library/Homebrew/test/support/fixtures/formulae/install-steps.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: strict
 # frozen_string_literal: true
 
 class InstallSteps < Formula
diff --git a/Library/Homebrew/test/utils/git_spec.rb b/Library/Homebrew/test/utils/git_spec.rb
index d7189c1564..876c4e5c08 100644
--- a/Library/Homebrew/test/utils/git_spec.rb
+++ b/Library/Homebrew/test/utils/git_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: true
 # frozen_string_literal: true
 
 require "utils/git"
diff --git a/Library/Homebrew/test/vulns/cvss_spec.rb b/Library/Homebrew/test/vulns/cvss_spec.rb
index 37fb10df81..963158f96d 100644
--- a/Library/Homebrew/test/vulns/cvss_spec.rb
+++ b/Library/Homebrew/test/vulns/cvss_spec.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: strict
 # frozen_string_literal: true
 
 require "vulns/cvss"