diff --git a/pkgs/development/python-modules/simanneal/default.nix b/pkgs/development/python-modules/simanneal/default.nix
index d059d720f8b..ad1f2643e5f 100644
--- a/pkgs/development/python-modules/simanneal/default.nix
+++ b/pkgs/development/python-modules/simanneal/default.nix
@@ -2,13 +2,13 @@
 
 buildPythonPackage rec {
   pname = "simanneal";
-  version = "0.4.1";
+  version = "0.4.2";
 
   src = fetchFromGitHub {
     owner = "perrygeo";
     repo = "simanneal";
     rev = version;
-    sha256 = "12499wvf7ii7cy8z2f1d472p7q9napg1lj0h9xx8l1mbr1hjlp3q";
+    sha256 = "0p75da4nbk6iy16aahl0ilqg605jrr6aa1pzfyd9hc7ak2vs6840";
   };
 
   checkInputs = [ pytest ];