diff --git a/pkgs/applications/science/math/giac/default.nix b/pkgs/applications/science/math/giac/default.nix
index e29ff24e250f..6acaa4067440 100644
--- a/pkgs/applications/science/math/giac/default.nix
+++ b/pkgs/applications/science/math/giac/default.nix
@@ -9,11 +9,11 @@ assert enableGUI -> libGLU_combined != null && xorg != null && fltk != null;
 stdenv.mkDerivation rec {
   name = "${attr}-${version}";
   attr = if enableGUI then "giac-with-xcas" else "giac";
-  version = "1.4.9";
+  version = "1.4.9-59";
 
   src = fetchurl {
-    url = "https://www-fourier.ujf-grenoble.fr/~parisse/giac/giac-${version}.tar.bz2";
-    sha256 = "1n7xxgpqrsq7cv5wgcmgag6jvxw5wijkf1yv1r5aizlf1rc7dhai";
+    url = "https://www-fourier.ujf-grenoble.fr/~parisse/debian/dists/stable/main/source/giac_${version}.tar.gz";
+    sha256 = "0dv5p5y6gkrsmz3xa7fw87rjyabwdwk09mqb09kb7gai9n9dgayk";
   };
 
   postPatch = ''