diff --git a/build.sh b/build.sh
index 1d0f0f23..47d8caa4 100755
--- a/build.sh
+++ b/build.sh
@@ -9,7 +9,7 @@ cd $(dirname $0)
 
 CKEDITOR_VERSION="4.5.9"
 
-CKBUILDER_VERSION="2.3.0"
+CKBUILDER_VERSION="2.3.1"
 CKBUILDER_URL="http://download.cksource.com/CKBuilder/$CKBUILDER_VERSION/ckbuilder.jar"
 
 MATHJAX_LIB_PATH="../mathjax/2.2"