diff --git a/package.json b/package.json
index 19b1e88..d8be8a8 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
     "typescript": ">=2.9.1"
   },
   "devDependencies": {
-    "@types/chai": "~4.2.4",
+    "@types/chai": "~4.1.7",
     "@types/mocha": "~5.2.7",
     "@types/node": "~12.0.4",
     "chai": "~4.2.0",