diff --git a/package-lock.json b/package-lock.json
index a921955..fc97b52 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "amplitude",
-  "version": "3.5.0",
+  "version": "4.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 55314dc..03837f4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "amplitude",
-  "version": "3.5.0",
+  "version": "4.0.0",
   "description": "A node wrapper for Amplitude analytics http api",
   "author": "Blade Barringer <blade@crookedneighbor.com>",
   "files": [