diff --git a/.github/workflows/test-e2e-redis-timeout.yml b/.github/workflows/test-e2e-redis-timeout.yml
index 9c318a1346c..501af0f240f 100644
--- a/.github/workflows/test-e2e-redis-timeout.yml
+++ b/.github/workflows/test-e2e-redis-timeout.yml
@@ -15,7 +15,7 @@ jobs:
     timeout-minutes: 30
     services:
       postgres:
-        image: postgres:16.6
+        image: postgres:16.6@sha256:557fea37a744d5f4c8faab304b0a90858b53ab119735a88c131fd19dab802f36
         env:
           POSTGRES_USER: llmproxy
           POSTGRES_PASSWORD: dbpassword9090