diff --git a/package.json b/package.json
index abd3425..0a56a7c 100644
--- a/package.json
+++ b/package.json
@@ -41,5 +41,6 @@
     "prettier": "^2.2.0",
     "typescript": "^4.1.2",
     "yorkie": "^2.0.0"
-  }
+  },
+  "packageManager": "yarn@1.22.22+sha512.a6b2f7906b721bba3d67d4aff083df04dad64c399707841b7acf00f6b133b7ac24255f2652fa22ae3534329dc6180534e98d17432037ff6fd140556e2bb3137e"
 }