diff --git a/docker-compose.dev.yml b/docker-compose.dev.yml
index fd58584..66a4180 100644
--- a/docker-compose.dev.yml
+++ b/docker-compose.dev.yml
@@ -16,7 +16,10 @@ services:
     ports:
       - '5432:5432'
     volumes:
-      - sar-postgres-data:/var/lib/postgresql/data
+      # Postgres 18+ usa /var/lib/postgresql (sem /data) — dados ficam em
+      # subdir por major-version pra suportar pg_upgrade --link sem
+      # boundary issues. Ref: docker-library/postgres#1259.
+      - sar-postgres-data:/var/lib/postgresql
       - ./scripts/postgres-init:/docker-entrypoint-initdb.d:ro
     healthcheck:
       test: ['CMD-SHELL', 'pg_isready -U sar -d sar_master']