diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 6d65da1..3df10dd 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -31,7 +31,9 @@
            - ci/312-DEV.yaml
          include:
            - environment-file: ci/312.yaml
-             os: macos-latest
+             os: macos-13 # Intel
+           - environment-file: ci/312.yaml
+             os: macos-14 # Apple Silicon
            - environment-file: ci/312.yaml
              os: windows-latest
        fail-fast: false