diff --git a/contrib/ChangeLog b/contrib/ChangeLog
index e6eda90d5d3dcb23b9b63d9a9db35da4e680adf2..c974b75e3587026315707b92df644c5cd3f80e16 100644
--- a/contrib/ChangeLog
+++ b/contrib/ChangeLog
@@ -1,3 +1,7 @@
+2016-06-13  Richard Biener  <rguenther@suse.de>
+
+	* download_prerequisites (ISL): Bump version to 0.16.1
+
 2016-06-10  Alan Hayward  <alan.hayward@arm.com>
 
 	* check_GNU_style.sh: Fix paste args for BSD
diff --git a/contrib/download_prerequisites b/contrib/download_prerequisites
index b135f5fe5f181f2754eae55aa36419a5be28b3c1..917ee23f3d95d9c071ec142f9ff3d66e7963982f 100755
--- a/contrib/download_prerequisites
+++ b/contrib/download_prerequisites
@@ -48,7 +48,7 @@ ln -sf $MPC mpc || exit 1
 
 # Necessary to build GCC with the Graphite loop optimizations.
 if [ "$GRAPHITE_LOOP_OPT" = "yes" ] ; then
-  ISL=isl-0.15
+  ISL=isl-0.16.1
 
   wget ftp://gcc.gnu.org/pub/gcc/infrastructure/$ISL.tar.bz2 || exit 1
   tar xjf $ISL.tar.bz2  || exit 1