diff --git a/Cargo.toml b/Cargo.toml
index 9cbdbac..a19554e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "munkres"
-version = "0.3.0"
+version = "0.4.0"
 authors = ["Michael Neumann <mneumann@ntecs.de>"]
 license = "BSD-3-Clause"
 repository = "https://github.com/mneumann/munkres-rs"