diff --git a/Cargo.toml b/Cargo.toml
index 3b46998..eb29106 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mtzip"
-version = "3.0.2"
+version = "4.0.0"
 edition = "2021"
 description = "A library for making zip archives with multithreaded compression"
 license = "MIT"