diff --git a/package.json b/package.json
index 2ccb2ed..74c933b 100644
--- a/package.json
+++ b/package.json
@@ -40,13 +40,13 @@
     "webpack-format-messages": "^1.0.2"
   },
   "devDependencies": {
-    "@std/esm": "^0.26.0",
     "@types/glob": "^5.0.34",
     "@types/mkdirp": "^0.5.2",
     "@types/rimraf": "^2.0.2",
     "compression": "^1.7.1",
     "eslint": "^4.13.1",
     "eslint-plugin-import": "^2.8.0",
+    "esm": "^3.0.28",
     "express": "^4.16.3",
     "get-port": "^3.2.0",
     "mocha": "^5.0.4",