diff --git a/Cargo.toml b/Cargo.toml
index 67548fc2..87c26da2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "epoll"
-version = "3.1.1"
+version = "4.0.0"
 authors = ["Nathan Sizemore <nathanrsizemore@gmail.com>"]
 description = "Safe epoll interface."
 readme = "README.md"