diff --git a/ChangeLog b/ChangeLog
index 8bffd0a..744233b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,11 +1,22 @@
+Release 0.3.12 - 2015/01/16
+* [maintenance] #126-#131, #135, #138,#139 #CodeClimate score is now 4.0! special thanks to @rthbound for many pull-requests.
+* [fixed] #133 Incompatible config generated on out_s3 version 0.5.x or newer.
+* [fixed] #140 Fluentd::Agent#logged_errors methods returned wrong errors.
+* [fixed] #136 Caused error on gem list fetching on some environments.
+* [improve] #124 Enable to note config history.
+* [improve] #137 Add "config test" button to config histories. You can check config before reuse that.
+
+
 Release 0.3.11 - 2014/12/19
 * [improve] Save config history. Now any saved config files can be restored to the current.
 
+
 Release 0.3.10 - 2014/12/17
 * [maintenance] Update components.
 * [improve] Add fluentd default plugin settings.
 * [fixed] Fix #121. Change to allow utf-8 string instead of ascii.
 
+
 Release 0.3.9 - 2014/12/01
 
 * [improve] Display current setting for each section.
diff --git a/Gemfile.lock b/Gemfile.lock
index 7270c17..cdb2c66 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    fluentd-ui (0.3.11)
+    fluentd-ui (0.3.12)
       addressable
       bundler
       draper (~> 1.3)
diff --git a/lib/fluentd-ui/version.rb b/lib/fluentd-ui/version.rb
index d67e3a6..229e16f 100644
--- a/lib/fluentd-ui/version.rb
+++ b/lib/fluentd-ui/version.rb
@@ -1,3 +1,3 @@
 module FluentdUI
-  VERSION = "0.3.11"
+  VERSION = "0.3.12"
 end