diff --git a/package.json b/package.json
index f43950383..452677a48 100644
--- a/package.json
+++ b/package.json
@@ -109,5 +109,6 @@
     "extension": true,
     "outputDir": "nbgrader/labextension",
     "schemaDir": "schema"
-  }
+  },
+  "packageManager": "yarn@3.5.0"
 }