diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 06c2d2f21daf..b718f3703f87 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -165,7 +165,7 @@ cp .github/misskey/test.yml .config/
 ```
 Prepare DB/Redis for testing.
 ```
-docker compose -f packages/backend/test/compose.yaml up
+docker compose -f packages/backend/test/compose.yml up
 ```
 Alternatively, prepare an empty (data can be erased) DB and edit `.config/test.yml`.