diff --git a/docker-compose.yaml b/docker-compose.yaml
index e0e6d05c5..726562b39 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -194,7 +194,7 @@ services:
 
   # ── Infrastructure ─────────────────────────────────────────────────────────
   postgres:
-    image: postgres:16-alpine
+    image: postgres:18-alpine
     environment:
       POSTGRES_USER: bernstein
       POSTGRES_PASSWORD: bernstein  # NOSONAR - development-only default, not used in production