diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,6 +1,6 @@
 <!-- -*- Markdown -*- -->
 
-## 0.8.3.9
+## 0.8.4.0
 
 - Fix of unsafeValueNull. ( https://github.com/khibino/haskell-relational-record/issues/55 )
 
diff --git a/relational-query.cabal b/relational-query.cabal
--- a/relational-query.cabal
+++ b/relational-query.cabal
@@ -1,5 +1,5 @@
 name:                relational-query
-version:             0.8.3.9
+version:             0.8.4.0
 synopsis:            Typeful, Modular, Relational, algebraic query engine
 description:         This package contiains typeful relation structure and
                      relational-algebraic query building DSL which can