diff --git a/package.json b/package.json
index eb31d53..3bfcfba 100644
--- a/package.json
+++ b/package.json
@@ -11,17 +11,17 @@
   "devDependencies": {
     "addons-linter": "^1.3.2",
     "ajv": "^6.6.2",
-    "chai": "^4.1.2",
+    "chai": "^4.2.0",
     "eslint": "^6.6.0",
     "eslint-plugin-no-unsanitized": "^2.0.0",
     "eslint-plugin-promise": "^3.4.0",
     "htmllint-cli": "0.0.7",
     "jsdom": "^11.6.2",
     "json": "^9.0.6",
-    "mocha": "^5.0.0",
+    "mocha": "^6.2.2",
     "npm-run-all": "^4.0.0",
-    "sinon": "^4.4.0",
-    "sinon-chai": "^2.14.0",
+    "sinon": "^7.5.0",
+    "sinon-chai": "^3.3.0",
     "stylelint": "^7.9.0",
     "stylelint-config-standard": "^16.0.0",
     "stylelint-order": "^0.3.0",