diff --git a/tools/isl/Makefile b/tools/isl/Makefile
index da37437119..c1000e1e31 100644
--- a/tools/isl/Makefile
+++ b/tools/isl/Makefile
@@ -7,11 +7,11 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=isl
-PKG_VERSION:=0.18
+PKG_VERSION:=0.20
 
 PKG_SOURCE_URL:=http://isl.gforge.inria.fr
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
-PKG_HASH:=0f35051cc030b87c673ac1f187de40e386a1482a0cfdf2c552dd6031b307ddc4
+PKG_HASH:=a5596a9fb8a5b365cb612e4b9628735d6e67e9178fae134a816ae195017e77aa
 
 HOST_BUILD_PARALLEL:=1