diff --git a/Cargo.toml b/Cargo.toml
index df69295..bd0cf4e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "copse"
-version = "0.3.0"
+version = "0.4.0"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/eggyal/copse.git"
 description = "Direct ports of the standard library's BTreeMap, BTreeSet and BinaryHeap collections, but that sort according to a specified total order rather than the `Ord` trait"