diff --git a/Cargo.toml b/Cargo.toml
index 2d7a3d90..eadce6fc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "legion"
-version = "0.3.1"
+version = "0.4.0"
 description = "High performance entity component system (ECS) library"
 authors = ["Thomas Gillen <thomas.gillen@googlemail.com>"]
 repository = "https://github.com/amethyst/legion"
@@ -21,7 +21,7 @@ stdweb = ["uuid/stdweb"]
 wasm-bindgen = ["uuid/wasm-bindgen"]
 
 [dependencies]
-legion_codegen = { path = "codegen", version = "0.3", optional = true }
+legion_codegen = { path = "codegen", version = "0.4.0", optional = true }
 smallvec = "1.4"
 itertools = "0.10"
 downcast-rs = "1.2"
diff --git a/codegen/Cargo.toml b/codegen/Cargo.toml
index 621d2ddc..f6fe2d52 100644
--- a/codegen/Cargo.toml
+++ b/codegen/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "legion_codegen"
-version = "0.3.0"
+version = "0.4.0"
 description = "#[system] proc macro for the legion library"
 authors = ["Thomas Gillen <thomas.gillen@googlemail.com>"]
 repository = "https://github.com/TomGillen/legion"