diff --git a/package.json b/package.json
index 60ded7c..0e35e72 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "chai": "^4.1.2",
     "dredd": "^5.1.11",
     "eslint": "^5.3.0",
-    "fibers": "^3.0.0",
+    "fibers": "^4.0.0",
     "mocha": "^5.2.0",
     "saucelabs": "^1.5.0",
     "selenium-standalone": "^6.15.1",