diff --git a/package-lock.json b/package-lock.json
index 36b196e..0c2b51f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "looks-same",
-  "version": "3.3.0",
+  "version": "4.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index bf7e83d..5897eec 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "looks-same",
-  "version": "3.3.0",
+  "version": "4.0.0",
   "description": "Pure node.js library for comparing PNG-images, taking into account human color perception.",
   "main": "index.js",
   "directories": {