diff --git a/.github/workflows/ci-osx.yaml b/.github/workflows/ci-osx.yaml
index a62ffdfa..34c27f9f 100644
--- a/.github/workflows/ci-osx.yaml
+++ b/.github/workflows/ci-osx.yaml
@@ -27,7 +27,7 @@ jobs:
       - name: Set up env
         shell: "bash -l {0}"
         run: |
-          conda create -n env python==${{matrix.python-version}} wheel pip compilers
+          conda create -n env python==${{matrix.python-version}} wheel pip compilers clang=12.0.1
           conda activate env
           which pip
           pip install -r requirements_test.txt -r requirements.txt