diff --git a/package.json b/package.json
index b40fe2c..adf96f5 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
     "@types/sinon": "^5.0.0",
     "espower-typescript": "^9.0.0",
     "istanbul-instrumenter-loader": "^3.0.0",
-    "karma": "^3.0.0",
+    "karma": "^4.0.1",
     "karma-chrome-launcher": "^2.2.0",
     "karma-detect-browsers": "^2.2.6",
     "karma-edge-launcher": "^0.4.2",