diff --git a/.github/workflows/tests_all.yml b/.github/workflows/tests_all.yml
index 40d7a108..815feb8e 100644
--- a/.github/workflows/tests_all.yml
+++ b/.github/workflows/tests_all.yml
@@ -6,7 +6,7 @@ jobs:
   build:
     strategy:
       matrix:
-        os: [macos-latest, ubuntu-latest, windows-latest]
+        os: [macos-12, ubuntu-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     timeout-minutes: 60
 
diff --git a/.github/workflows/tests_minversion.yml b/.github/workflows/tests_minversion.yml
index 8bfc7c8a..0e2f6e43 100644
--- a/.github/workflows/tests_minversion.yml
+++ b/.github/workflows/tests_minversion.yml
@@ -6,7 +6,7 @@ jobs:
   build:
     strategy:
       matrix:
-        os: [macos-latest, ubuntu-latest]  # windows-latest
+        os: [macos-12, ubuntu-latest]  # windows-latest
     runs-on: ${{ matrix.os }}
     timeout-minutes: 60
 
diff --git a/.github/workflows/tests_mpi.yml b/.github/workflows/tests_mpi.yml
index 5b2c5bea..3d7aab92 100644
--- a/.github/workflows/tests_mpi.yml
+++ b/.github/workflows/tests_mpi.yml
@@ -6,7 +6,7 @@ jobs:
   build:
     strategy:
       matrix:
-        os: [macos-latest, ubuntu-latest] #, windows-latest]
+        os: [macos-12, ubuntu-latest] #, windows-latest]
     runs-on: ${{ matrix.os }}
     timeout-minutes: 30