diff --git a/pkgs/development/python-modules/simplesat/default.nix b/pkgs/development/python-modules/simplesat/default.nix
index 3f81b311c811..35359c29396d 100644
--- a/pkgs/development/python-modules/simplesat/default.nix
+++ b/pkgs/development/python-modules/simplesat/default.nix
@@ -1,42 +1,34 @@
 {
-  buildPythonPackage,
-  fetchFromGitHub,
-  writeText,
   lib,
   attrs,
+  buildPythonPackage,
+  fetchFromGitHub,
   mock,
   okonomiyaki,
   pytestCheckHook,
+  pythonOlder,
   pyyaml,
   setuptools,
   six,
 }:
 
-let
-  version = "0.9.0";
-  versionFile = writeText "simplesat_ver" ''
-    version = '${version}'
-    full_version = '${version}'
-    git_revision = '0000000000000000000000000000000000000000'
-    is_released = True
-    msi_version = '${version}.000'
-    version_info = (${lib.versions.major version}, ${lib.versions.minor version}, ${lib.versions.patch version}, 'final', 0)
-  '';
-in
 buildPythonPackage rec {
   pname = "simplesat";
-  inherit version;
+  version = "0.9.1";
   pyproject = true;
 
+  disabled = pythonOlder "3.9";
+
   src = fetchFromGitHub {
     owner = "enthought";
     repo = "sat-solver";
     rev = "refs/tags/v${version}";
-    hash = "sha256-8sUOV42MLM3otG3EKvVzKKGAUpSlaTj850QZxZa62bE=";
+    hash = "sha256-/fBnpf1DtaF+wQYZztcB8Y20/ZMYxrF3fH5qRsMucL0=";
   };
 
-  preConfigure = ''
-    cp ${versionFile} simplesat/_version.py
+  postPatch = ''
+    substituteInPlace setup.cfg \
+      --replace-fail "version = file: VERSION" "version = ${version}"
   '';
 
   build-system = [ setuptools ];
@@ -47,20 +39,26 @@ buildPythonPackage rec {
     six
   ];
 
-  pythonImportsCheck = [ "simplesat" ];
-
   nativeCheckInputs = [
     mock
     pytestCheckHook
     pyyaml
   ];
 
+  pythonImportsCheck = [ "simplesat" ];
+
+  preCheck = ''
+    substituteInPlace simplesat/tests/test_pool.py \
+      --replace-fail "assertRaisesRegexp" "assertRaisesRegex"
+  '';
+
   pytestFlagsArray = [ "simplesat/tests" ];
 
   meta = with lib; {
-    homepage = "https://github.com/enthought/sat-solver";
     description = "Prototype for SAT-based dependency handling";
-    maintainers = with maintainers; [ genericnerdyusername ];
+    homepage = "https://github.com/enthought/sat-solver";
+    changelog = "https://github.com/enthought/sat-solver/blob/v${version}/CHANGES.rst";
     license = licenses.bsd3;
+    maintainers = with maintainers; [ genericnerdyusername ];
   };
 }