diff --git a/pkgs/development/python-modules/python-lsp-server/default.nix b/pkgs/development/python-modules/python-lsp-server/default.nix
index 41af2ad8e3ef..eafad1a9ab09 100644
--- a/pkgs/development/python-modules/python-lsp-server/default.nix
+++ b/pkgs/development/python-modules/python-lsp-server/default.nix
@@ -23,6 +23,7 @@
 , setuptools-scm
 , stdenv
 , ujson
+, whatthepatch
 , yapf
 , withAutopep8 ? true
 , withFlake8 ? true
@@ -50,7 +51,7 @@ buildPythonPackage rec {
   };
 
   postPatch = ''
-    substituteInPlace setup.cfg \
+    substituteInPlace pyproject.toml \
       --replace "--cov-report html --cov-report term --junitxml=pytest.xml" "" \
       --replace "--cov pylsp --cov test" "" \
       --replace "mccabe>=0.6.0,<0.7.0" "mccabe"
@@ -75,7 +76,7 @@ buildPythonPackage rec {
   ++ lib.optional withPyflakes pyflakes
   ++ lib.optional withPylint pylint
   ++ lib.optional withRope rope
-  ++ lib.optional withYapf yapf;
+  ++ lib.optionals withYapf [ whatthepatch yapf ];
 
   checkInputs = [
     flaky
@@ -87,7 +88,9 @@ buildPythonPackage rec {
   # pyqt5 is broken on aarch64-darwin
   ++ lib.optionals (!stdenv.isDarwin || !stdenv.isAarch64) [ pyqt5 ];
 
-  disabledTests = lib.optional (!withPycodestyle) "test_workspace_loads_pycodestyle_config"
+  disabledTests = [
+    "test_numpy_completions" # https://github.com/python-lsp/python-lsp-server/issues/243
+  ] ++ lib.optional (!withPycodestyle) "test_workspace_loads_pycodestyle_config"
   # pyqt5 is broken on aarch64-darwin
   ++ lib.optional (stdenv.isDarwin && stdenv.isAarch64) "test_pyqt_completion";
 
diff --git a/pkgs/development/python-modules/whatthepatch/default.nix b/pkgs/development/python-modules/whatthepatch/default.nix
new file mode 100644
index 000000000000..9244e26520cd
--- /dev/null
+++ b/pkgs/development/python-modules/whatthepatch/default.nix
@@ -0,0 +1,30 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, pytestCheckHook
+}:
+
+buildPythonPackage rec {
+  pname = "whatthepatch";
+  version = "1.0.2";
+
+  src = fetchFromGitHub {
+    owner = "cscorley";
+    repo = pname;
+    rev = version;
+    hash = "sha256-0l/Ebq7Js9sKFJ/RzkQ1aWEDCxt+COVd2qVnLSWwFx0=";
+  };
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [ "whatthepatch" ];
+
+  meta = with lib; {
+    description = "Python library for both parsing and applying patch files";
+    homepage = "https://github.com/cscorley/whatthepatch";
+    license = licenses.mit;
+    maintainers = with maintainers; [ jyooru ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index d2cb3b326d1d..850006795bca 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -11369,6 +11369,8 @@ in {
 
   wget = callPackage ../development/python-modules/wget { };
 
+  whatthepatch = callPackage ../development/python-modules/whatthepatch { };
+
   wheel = callPackage ../development/python-modules/wheel { };
 
   wheel-filename = callPackage ../development/python-modules/wheel-filename { };