diff --git a/package-lock.json b/package-lock.json
index c126d58..cc54a88 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "serialize-javascript",
-  "version": "3.1.0",
+  "version": "4.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 8d3c320..aab2415 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "serialize-javascript",
-  "version": "3.1.0",
+  "version": "4.0.0",
   "description": "Serialize JavaScript to a superset of JSON that includes regular expressions and functions.",
   "main": "index.js",
   "scripts": {