diff --git a/package.json b/package.json
index c6e44b48..15ff663d 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
     "Veselin Todorov <hi@vesln.com>",
     "John Firebaugh <john.firebaugh@gmail.com>"
   ],
-  "version": "4.3.1",
+  "version": "5.0.0-alpha.0",
   "repository": {
     "type": "git",
     "url": "https://github.com/chaijs/chai"