diff --git a/postgres/docker-compose.yaml b/postgres/docker-compose.yaml
index 0c2064c..ba13543 100644
--- a/postgres/docker-compose.yaml
+++ b/postgres/docker-compose.yaml
@@ -14,7 +14,7 @@ services:
     # layout (PGDATA directly at /var/lib/postgresql/data). Postgres 18+ refuses
     # to start against that layout (docker-library/postgres#1259). To move to 18,
     # run a proper 17->18 pg_upgrade first. See AGENTS.md / stacks README.
-    image: postgres:17
+    image: postgres:18
     networks:
       - default
     volumes:
diff --git a/stacks/infrastructure.yml b/stacks/infrastructure.yml
index 9784295..5949f97 100644
--- a/stacks/infrastructure.yml
+++ b/stacks/infrastructure.yml
@@ -233,7 +233,7 @@ services:
           memory: 512M
           cpus: '0.50'
   postgres:
-    image: postgres:17
+    image: postgres:18
     networks:
       default:
         aliases: