diff --git a/package.json b/package.json
index 04b43cf..ff61ad2 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,7 @@
     "eslint-plugin-prettier": "^3.1.4",
     "expect.js": "~0.3.1",
     "jquery": ">=3.0.0",
-    "mocha": "~1.20.1",
+    "mocha": "~9.0.3",
     "ol": "^6.1.1",
     "prettier": "^2.0.4",
     "rollup": "^0.41.4",