diff --git a/.github/workflows/build-and-test.yaml b/.github/workflows/build-and-test.yaml
index 24ee631..878d93c 100644
--- a/.github/workflows/build-and-test.yaml
+++ b/.github/workflows/build-and-test.yaml
@@ -12,7 +12,9 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
+    container:
+      image: python:2.7.18-buster
     strategy:
       max-parallel: 4
       matrix: