diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6ecb653d15..847a57feb5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -3,6 +3,8 @@ on: [push]
 jobs:
   build:
     runs-on: ubuntu-20.04
+        container:
+          image: python:2.7.18-buster
     strategy:
       fail-fast: false
       matrix: