diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f410930e..b1dea74c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -268,6 +268,11 @@ build-macos-as:
     - brew update-reset
     - unset HOMEBREW_NO_AUTO_UPDATE
     - brew bundle --file .ci/macos/Brewfile
+    ### CMake 3.29 issue with re2 workaround.
+    - brew uninstall cmake
+    - curl "https://raw.githubusercontent.com/Homebrew/homebrew-core/9ae2628ed1337f342960fd6c2598ae69cf057615/Formula/c/cmake.rb" -o /tmp/cmake.rb
+    - brew install -s /tmp/cmake.rb
+    ### End Cmake 3.29 issue with re2 workaround.
     - pipx install aqtinstall
     - pipx ensurepath
     - . ~/.zshrc