diff --git a/ChangeLog b/ChangeLog
index a478367304..44d18d9827 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Nov 22 17:07:00 2013  Kenta Murata  <mrkn@mrkn.jp>
+
+	* ext/bigdecimal/bigdecimal.gemspec: version 1.2.2.
+
 Fri Nov 22 17:04:00 2013  Kenta Murata  <mrkn@mrkn.jp>
 
 	* ext/bigdecimal/bigdecimal.c (BigDecimal_data_type):
diff --git a/ext/bigdecimal/bigdecimal.gemspec b/ext/bigdecimal/bigdecimal.gemspec
index bb85526f62..7131c21b3b 100644
--- a/ext/bigdecimal/bigdecimal.gemspec
+++ b/ext/bigdecimal/bigdecimal.gemspec
@@ -1,5 +1,5 @@
 # -*- ruby -*-
-_VERSION = "1.2.1"
+_VERSION = "1.2.2"
 
 Gem::Specification.new do |s|
   s.name = "bigdecimal"