diff --git a/http-semantics.cabal b/http-semantics.cabal
--- a/http-semantics.cabal
+++ b/http-semantics.cabal
@@ -1,6 +1,6 @@
 cabal-version:   3.0
 name:            http-semantics
-version:         0.3.1
+version:         0.4.0
 license:         BSD-3-Clause
 license-file:    LICENSE
 maintainer:      Kazu Yamamoto <kazu@iij.ad.jp>