diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 4e8c7da..1c45c06 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -20,6 +20,7 @@ jobs:
     strategy:
       matrix:
         postgres_major_version: [
+          "9.5",
           "9.6",
           "10",
           "11",