diff --git a/.github/workflows/python-app.yml b/.github/workflows/python-app.yml
index 62183aa6..be37c585 100644
--- a/.github/workflows/python-app.yml
+++ b/.github/workflows/python-app.yml
@@ -8,7 +8,7 @@ on:
 
 jobs:
   build_osx:
-    runs-on: macos-latest
+    runs-on: macos-12.7.4
     steps:
       - uses: actions/checkout@v3
         with:
diff --git a/.github/workflows/pythontests.yml b/.github/workflows/pythontests.yml
index d89b5a44..f32904ed 100644
--- a/.github/workflows/pythontests.yml
+++ b/.github/workflows/pythontests.yml
@@ -1,7 +1,7 @@
 on: ['push', 'pull_request']
 jobs:
   osx_mdp_tests:
-    runs-on: macos-latest
+    runs-on: macos-12.7.4
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python 3.7