diff --git a/package.json b/package.json
index 5c54844..8605d8b 100644
--- a/package.json
+++ b/package.json
@@ -47,7 +47,7 @@
     "karma": "^4.0.0",
     "karma-browserify": "^6.0.0",
     "karma-chai": "^0.1.0",
-    "karma-firefox-launcher": "^1.1.0",
+    "karma-firefox-launcher": "^2.1.1",
     "karma-mocha": "^2.0.1",
     "karma-mocha-reporter": "^2.2.5",
     "karma-sinon": "^1.0.4",