diff --git a/contrib/ChangeLog b/contrib/ChangeLog
index 96476db09d9..43a67baf942 100644
--- a/contrib/ChangeLog
+++ b/contrib/ChangeLog
@@ -1,3 +1,7 @@
+2014-02-13  Richard Biener  <rguenther@suse.de>
+
+	* download_prerequisites: Update ISL and CLOOG versions.
+
 2014-01-31  Brooks Moses  <bmoses@google.com>
 
 	* gcc_update (files_and_dependencies): Add aarch64-tune.md.
diff --git a/contrib/download_prerequisites b/contrib/download_prerequisites
index dd2e9f885fc..cc27143ea25 100755
--- a/contrib/download_prerequisites
+++ b/contrib/download_prerequisites
@@ -43,8 +43,8 @@ ln -sf $MPC mpc || exit 1
 
 # Necessary to build GCC with the Graphite loop optimizations.
 if [ "$GRAPHITE_LOOP_OPT" = "yes" ] ; then
-  ISL=isl-0.11.1
-  CLOOG=cloog-0.18.0
+  ISL=isl-0.12.2
+  CLOOG=cloog-0.18.1
 
   wget ftp://gcc.gnu.org/pub/gcc/infrastructure/$ISL.tar.bz2 || exit 1
   tar xjf $ISL.tar.bz2  || exit 1