diff --git a/.github/workflows/build-macos.yml b/.github/workflows/build-macos.yml
index dd5ec7e6f..918f6c0fa 100644
--- a/.github/workflows/build-macos.yml
+++ b/.github/workflows/build-macos.yml
@@ -79,6 +79,7 @@ jobs:
           rm -rf llvm-project
           make llvm-source
           # install dependencies
+          brew uninstall cmake || true
           HOMEBREW_NO_AUTO_UPDATE=1 brew install cmake ninja
           # build!
           make llvm-build