diff --git a/SPECS/isl.spec b/SPECS/isl.spec
index a70dd25..1d3f4ef 100644
--- a/SPECS/isl.spec
+++ b/SPECS/isl.spec
@@ -24,10 +24,10 @@ BuildRequires: pkgconfig
 BuildRequires: make
 Provides: isl = %{oldversion}
 
-Source0: http://isl.gforge.inria.fr/isl-%{version}.tar.xz
+Source0: https://libisl.sourceforge.io/isl-%{version}.tar.xz
 
 # Current gcc requires exactly 0.14
-Source1: http://isl.gforge.inria.fr/isl-%{oldversion}.tar.xz
+Source1: https://libisl.sourceforge.io/isl-%{oldversion}.tar.xz
 
 %description
 isl is a library for manipulating sets and relations of integer points