diff --git a/Cargo.toml b/Cargo.toml
index 8b1c398..7779aef 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "puzzle-solver"
-version = "0.3.0"
+version = "0.4.0"
 authors = ["David Wang <millimillenary@gmail.com>"]
 homepage = "https://github.com/wangds/puzzle-solver.git"
 repository = "https://github.com/wangds/puzzle-solver.git"
diff --git a/README.md b/README.md
index 8f821cb..bf0f98f 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,7 @@ Add Puzzle Solver as a dependency to your project's Cargo.toml:
 
 ```toml
 [dependencies]
-puzzle-solver = "0.3"
+puzzle-solver = "0.4"
 ```
 
 Import the library in your project, e.g.: