diff --git a/.github/workflows/unittests.yml b/.github/workflows/unittests.yml
index 9b460c2f..b2375c36 100644
--- a/.github/workflows/unittests.yml
+++ b/.github/workflows/unittests.yml
@@ -14,15 +14,15 @@ jobs:
       fail-fast: true
       matrix:
         include:
-          - os: ubuntu-latest
+          - os: ubuntu-22.04
             python-version: "3.9"
-          - os: ubuntu-latest
+          - os: ubuntu-22.04
             python-version: "3.10"
-          - os: ubuntu-latest
+          - os: ubuntu-22.04
             python-version: "3.11"
-          - os: ubuntu-latest
+          - os: ubuntu-22.04
             python-version: "3.12"
-          - os: ubuntu-latest
+          - os: ubuntu-22.04
             python-version: "3.13"
           - os: windows-latest
             python-version: "3.11"