diff --git a/dev/docker-compose.yml b/dev/docker-compose.yml
index 0b78ce8d6..2b2b60dfe 100644
--- a/dev/docker-compose.yml
+++ b/dev/docker-compose.yml
@@ -4,7 +4,7 @@ services:
   redis:
     image: docker.io/redis:7-alpine
     ports:
-      - "6379:6379"
+      - "26379:6379"
 
   db:
     image: docker.io/groonga/pgroonga:latest-alpine-16
@@ -13,6 +13,6 @@ services:
       - "POSTGRES_USER=firefish"
       - "POSTGRES_DB=firefish_db"
     ports:
-      - "5432:5432"
+      - "25432:5432"
     volumes:
       - "../neko/install.sql:/docker-entrypoint-initdb.d/install.sql:ro"
diff --git a/docs/contributing.md b/docs/contributing.md
index c314a4daa..363c7e314 100644
--- a/docs/contributing.md
+++ b/docs/contributing.md
@@ -33,13 +33,13 @@
     port: 3000
     db:
       host: localhost
-      port: 5432
+      port: 25432
       db: firefish_db
       user: firefish
       pass: password
     redis:
       host: localhost
-      port: 6379
+      port: 26379
     ```
 
 コンテナを作り直すと簡単にデータベースを初期化できます。