diff --git a/package.json b/package.json
index 40aff03..11d3b72 100644
--- a/package.json
+++ b/package.json
@@ -57,7 +57,7 @@
     "gulp-strip-comments": "^2.5.1",
     "gulp-uglify": "^3.0.0",
     "istanbul": "^0.4.5",
-    "mocha": "^4.0.1",
+    "mocha": "^6.2.3",
     "pump": "^1.0.3",
     "rollup": "^0.52.0",
     "rollup-plugin-babel": "^3.0.2",