diff --git a/docker-compose.yml b/docker-compose.yml
index d337060..5e1dcb8 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,6 +1,6 @@
 services:
   postgres:
-    image: postgres:15-alpine
+    image: postgres:15-alpine@sha256:fe0737ba566a2c5b2a28f34433c0a423261900ec17b9bf7ad115e1aae7e57f1b
     ports:
       - "5432:5432"
     environment: