diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 4705661..5059ac8 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -54,7 +54,7 @@ jobs:
   test-py27:
     name: Python 2.7
     runs-on: ubuntu-latest
-    container: python:2.7-stretch
+    container: python:2.7-buster
 
     steps:
     - uses: actions/checkout@v3