diff --git a/package.json b/package.json
index 8dff321..ddf6d03 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
   "homepage": "https://git.bitmessage.org/Bitmessage/bitmessage-js",
   "devDependencies": {
     "browserify": "16.5.0",
-    "chai": "*",
+    "chai": "~4.3.4",
     "jsdoc": "^4.0.2",
     "jshint": "*",
     "karma": "6.4.1",