diff --git a/package-lock.json b/package-lock.json
index 11c1bf0..63589ef 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -74,9 +74,9 @@
       }
     },
     "@screeps/engine": {
-      "version": "4.2.20",
-      "resolved": "https://npm.pkg.github.com/download/@screeps/engine/4.2.20/6e03b79b733e2718610ceaf213c8e569ec69c455",
-      "integrity": "sha512-dUK4z0e+SrkBbf84I7ed2qY+C8rJNNweb5LbL0rlu4hxa7tSZv9C/g8ZD72o2rRNOjMqxUlVLtCJTVPjKtfvEw==",
+      "version": "4.2.21",
+      "resolved": "https://registry.npmjs.org/@screeps/engine/-/engine-4.2.21.tgz",
+      "integrity": "sha512-PUx9tSWAs7YOpoMmVVWEbJHF6KBbBxASXMnOj5em2uu3aamKxUMKeRgca//Yy94TAwZz5fUotIxUixpY3lIsWg==",
       "requires": {
         "@screeps/pathfinding": "^0.4.17",
         "bulk-require": "^0.2.1",
diff --git a/package.json b/package.json
index 7716ed9..7fdb854 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "@screeps/backend": "3.2.4",
     "@screeps/common": "2.15.5",
     "@screeps/driver": "5.2.3",
-    "@screeps/engine": "4.2.20",
+    "@screeps/engine": "4.2.21",
     "@screeps/launcher": "4.1.1",
     "@screeps/pathfinding": "0.4.17",
     "@screeps/storage": "5.1.2",