diff --git a/packages/genodelabs/default.nix b/packages/genodelabs/default.nix
index fdfe6d3..f2bb67e 100644
--- a/packages/genodelabs/default.nix
+++ b/packages/genodelabs/default.nix
@@ -125,12 +125,7 @@ let
 
   toolchain' = buildPackages.stdenv.mkDerivation rec {
     pname = "toolchain";
-    version = "19.05";
-    # use the sources of the last toolchain update
-    src = fetchurl {
-      url = "https://github.com/genodelabs/genode/archive/${version}.tar.gz";
-      hash = "sha256-nK+smAvxbbcQQ3gY7BmFvnQ6MjNbbUfvcU5qXxAKKNc=";
-    };
+    inherit (genodeSources) src version;
 
     nativeBuildInputs = with buildPackages; [
       autoconf264