diff --git a/Cargo.toml b/Cargo.toml
index e07f02f..7fe6d85 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "async-sse"
-version = "3.0.1"
+version = "4.0.0"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/http-rs/async-sse"
 documentation = "https://docs.rs/async-sse"