diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 23cf664..75a71dc 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -34,7 +34,10 @@ jobs:
       - name: Install and start Orbstack
         if: runner.os == 'macOS'
         run: |
-          brew install --cask https://github.com/Homebrew/homebrew-cask/blob/65da904d37b45eb3f0644e6419ebde37ef927f20/Casks/o/orbstack.rb
+          brew tap-new $USER/local-orbstack
+          brew tap homebrew/core --force
+          brew extract --version=1.5.1 orbstack $USER/local-orbstack
+          brew install orbstack@1.5.1
           orb
 
       - name: Checkout code