diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 79a083bf..6a7f7696 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ permissions:
 
 jobs:
   tests:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     services:
       postgres:
         image: postgres:11.5