diff --git a/docker-compose.yml b/docker-compose.yml
index 2be9889..cdfa799 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -10,7 +10,7 @@ services:
     environment:
       - FLASK_APP=app.py
       - FLASK_ENV=production
-      - DATABASE_URL=postgresql://postgres:postgres@db:5432/docupulse_${PORT:-10335}
+      - DATABASE_URL=postgresql://postgres:postgres@db:${DB_PORT:-5432}/docupulse_${PORT:-10335}
       - POSTGRES_USER=postgres
       - POSTGRES_PASSWORD=postgres
       - POSTGRES_DB=docupulse_${PORT:-10335}
@@ -37,6 +37,8 @@ services:
 
   db:
     image: postgres:13
+    ports:
+      - "${DB_PORT:-5432}:5432"
     environment:
       - POSTGRES_USER=postgres
       - POSTGRES_PASSWORD=postgres