diff --git a/lib/rggen/c_header/version.rb b/lib/rggen/c_header/version.rb
index 8592329..31079b1 100644
--- a/lib/rggen/c_header/version.rb
+++ b/lib/rggen/c_header/version.rb
@@ -2,6 +2,6 @@
 
 module RgGen
   module CHeader
-    VERSION = '0.3.0'
+    VERSION = '0.4.0'
   end
 end