diff --git a/CHANGELOG.ja.rdoc b/CHANGELOG.ja.rdoc
index 1e6cb9a5363..a492a3343c0 100644
--- a/CHANGELOG.ja.rdoc
+++ b/CHANGELOG.ja.rdoc
@@ -1,3 +1,11 @@
+=== 1.5.11 / 2013年12月14日
+
+* Bugfixes
+
+  * (JRuby) Fix out of memory bug when certain invalid documents are parsed.
+  * (JRuby) Fix regression of billion-laughs vulnerability. #586
+
+
 === 1.5.10 / 2013年6月7日
 
 * バグ修正
diff --git a/CHANGELOG.rdoc b/CHANGELOG.rdoc
index 1b85e0f1179..5a535afcb17 100644
--- a/CHANGELOG.rdoc
+++ b/CHANGELOG.rdoc
@@ -1,3 +1,10 @@
+=== 1.5.11 / 2013-12-14
+
+* Bugfixes
+
+  * (JRuby) Fix out of memory bug when certain invalid documents are parsed.
+  * (JRuby) Fix regression of billion-laughs vulnerability. #586
+
 === 1.5.10 / 2013-06-07
 
 * Bugfixes