diff --git a/docker-compose.yml b/docker-compose.yml
index fc1c3ca..b5ad0ce 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -19,7 +19,7 @@ services:
       - matrix
 
   db:
-    image: docker.io/postgres:12.21-alpine
+    image: docker.io/postgres:17.1-alpine@sha256:0d9624535618a135c5453258fd629f4963390338b11aaffb92292c12df3a6c17
     restart: unless-stopped
     environment:
       - POSTGRES_USER=${DC_MATRIX_POSTGRES_USER:-synapse}