diff --git a/Library/Homebrew/github_runner_matrix.rb b/Library/Homebrew/github_runner_matrix.rb
index c3895ceffe..d7b22b33da 100644
--- a/Library/Homebrew/github_runner_matrix.rb
+++ b/Library/Homebrew/github_runner_matrix.rb
@@ -130,7 +130,7 @@ class GitHubRunnerMatrix
   end
 
   NEWEST_GITHUB_ACTIONS_INTEL_MACOS_RUNNER = :ventura
-  OLDEST_GITHUB_ACTIONS_INTEL_MACOS_RUNNER = :big_sur
+  OLDEST_GITHUB_ACTIONS_INTEL_MACOS_RUNNER = :monterey
   NEWEST_GITHUB_ACTIONS_ARM_MACOS_RUNNER = :sonoma
   OLDEST_GITHUB_ACTIONS_ARM_MACOS_RUNNER = :sonoma
   GITHUB_ACTIONS_RUNNER_TIMEOUT = 360