diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index bc4ad7e..e08ccfb 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -7,7 +7,7 @@ on:
 jobs:
   test:
    name: Run Unittest
-   runs-on: ubuntu-22.04
+   runs-on: ubuntu-20.04
    strategy:
     matrix:
       python: ['3.9', '3.10', '3.11', '3.12']
@@ -80,7 +80,7 @@ jobs:
 
   release:
     name: Create Github release
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-20.04
     needs: test
     if: startsWith(github.event.ref, 'refs/tags/v') && endsWith(github.event.ref, '.0')
 
@@ -96,7 +96,7 @@ jobs:
 
   publish:
     name: Publish to PyPi
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-20.04
     needs: test
     if: startsWith(github.event.ref, 'refs/tags/v')