diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 725e2a0..c4935f9 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -46,11 +46,11 @@ jobs:
           DB_USER: root
 
   test-on-postgres:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         ruby-version: ['2.6', '2.7', '3.0']
-        postgres-version: [13, 12, 11, 10, 9.6]
+        postgres-version: [13, 12]
 
     steps:
       - uses: actions/checkout@v2