diff --git a/.github/workflows/unit_tests.yml b/.github/workflows/unit_tests.yml
index 8f5d224c7..6e7c90f7e 100644
--- a/.github/workflows/unit_tests.yml
+++ b/.github/workflows/unit_tests.yml
@@ -12,8 +12,8 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest]
-        python-version: [3.8, 3.9]
+        os: [ubuntu-20.04, ubuntu-22.04, ubuntu-24.04]
+        python-version: [3.8]
 
     steps:
       - uses: actions/checkout@v4
@@ -25,7 +25,7 @@ jobs:
       - name: Install ubuntu dependencies
         shell: bash -el {0}
         run: |
-          if [ "${{ matrix.os }}" == "ubuntu-latest" ]; then
+          if [ "${{ matrix.os }}" == "ubuntu-"* ]; then
             sudo add-apt-repository ppa:ubuntu-toolchain-r/test
             sudo apt-get update
             sudo apt-get install libopenmpi-dev openmpi-bin