diff --git a/.github/workflows/python-app-mysql55.yml b/.github/workflows/python-app-mysql55.yml
index 245293f32..7b9635fed 100644
--- a/.github/workflows/python-app-mysql55.yml
+++ b/.github/workflows/python-app-mysql55.yml
@@ -16,7 +16,7 @@ jobs:
   build:
     strategy:
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-20.04, ubuntu-18.04, ubuntu-22.04]
     runs-on: ${{ matrix.os }}
     #runs-on: ubuntu-latest