diff --git a/package.json b/package.json
index 30b25fa..826114d 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
   "devDependencies": {
     "chai": "^4.0.2",
     "coffee-script": "^1.9.0",
-    "mocha": "^5.0.0",
+    "mocha": "^6.2.0",
     "mocha-gwt": "^0.2.0",
     "pikaday": "^1.7.0",
     "ramda": "^0.25.0",