diff --git a/pkgs/development/octave-modules/geometry/default.nix b/pkgs/development/octave-modules/geometry/default.nix
index 536634963481..316b55e2f529 100644
--- a/pkgs/development/octave-modules/geometry/default.nix
+++ b/pkgs/development/octave-modules/geometry/default.nix
@@ -1,18 +1,17 @@
 {
   buildOctavePackage,
   lib,
-  fetchhg,
+  fetchurl,
   matgeom,
 }:
 
 buildOctavePackage rec {
   pname = "geometry";
-  version = "unstable-2021-07-07";
+  version = "4.1.0";
 
-  src = fetchhg {
-    url = "http://hg.code.sf.net/p/octave/${pname}";
-    rev = "04965cda30b5f9e51774194c67879e7336df1710";
-    sha256 = "sha256-ECysYOJMF4gPiCFung9hFSlyyO60X3MGirQ9FlYDix8=";
+  src = fetchurl {
+    url = "mirror://sourceforge/octave/${pname}-${version}.tar.gz";
+    sha256 = "sha256-28FliEXJfS1mh8FJCmG0PTWZE9M0IOR1tlnzNfejQ2A=";
   };
 
   requiredOctavePackages = [