diff --git a/resolvers/webpack/package.json b/resolvers/webpack/package.json
index fc8c42e6d..0daba3fb2 100644
--- a/resolvers/webpack/package.json
+++ b/resolvers/webpack/package.json
@@ -49,13 +49,13 @@
     "webpack": ">=1.11.0"
   },
   "devDependencies": {
-    "babel-plugin-istanbul": "^4.1.6",
+    "babel-plugin-istanbul": "^5.0.1",
     "babel-preset-es2015-argon": "latest",
     "babel-register": "^6.26.0",
     "chai": "^3.5.0",
     "coveralls": "^3.1.0",
-    "mocha": "^3.5.3",
-    "nyc": "^11.9.0",
+    "mocha": "^6.2.3",
+    "nyc": "^14.0.0",
     "webpack": "https://gist.github.com/ljharb/9cdb687f3806f8e6cb8a365d0b7840eb"
   },
   "engines": {