diff --git a/pkgs/development/python-modules/rstcheck-core/default.nix b/pkgs/development/python-modules/rstcheck-core/default.nix
index 74a1dd2dbff2..971e0b12cfd1 100644
--- a/pkgs/development/python-modules/rstcheck-core/default.nix
+++ b/pkgs/development/python-modules/rstcheck-core/default.nix
@@ -1,23 +1,23 @@
-{ stdenv
-, lib
-, buildPythonPackage
-, docutils
-, fetchFromGitHub
-, importlib-metadata
-, mock
-, pydantic
-, pytest-mock
-, pytestCheckHook
-, pythonOlder
-, setuptools
-, setuptools-scm
-, typing-extensions
-, wheel
+{
+  lib,
+  stdenv,
+  buildPythonPackage,
+  docutils,
+  fetchFromGitHub,
+  importlib-metadata,
+  mock,
+  pydantic,
+  pytest-mock,
+  pytestCheckHook,
+  pythonOlder,
+  setuptools,
+  setuptools-scm,
+  typing-extensions,
 }:
 
 buildPythonPackage rec {
   pname = "rstcheck-core";
-  version = "1.2.0";
+  version = "1.2.1";
   pyproject = true;
 
   disabled = pythonOlder "3.8";
@@ -26,26 +26,27 @@ buildPythonPackage rec {
     owner = "rstcheck";
     repo = "rstcheck-core";
     rev = "refs/tags/v${version}";
-    hash = "sha256-cKJNktIB4vXt1MPRgYrJQ0aksmrVu7Y2uTyUjdx5YdA=";
+    hash = "sha256-PiQMk0lIv24S6qXMYIQR+SkSji+WA30ivWs2uPQwf2A=";
   };
 
-  nativeBuildInputs = [
+  build-system = [
     setuptools
     setuptools-scm
-    wheel
   ];
 
   env = {
     NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isClang "-Wno-strict-prototypes";
   };
 
-  propagatedBuildInputs = [
-    docutils
-    pydantic
-  ] ++ lib.optionals (pythonOlder "3.9") [
-    importlib-metadata
-    typing-extensions
-  ];
+  dependencies =
+    [
+      docutils
+      pydantic
+    ]
+    ++ lib.optionals (pythonOlder "3.9") [
+      importlib-metadata
+      typing-extensions
+    ];
 
   nativeCheckInputs = [
     mock
@@ -58,9 +59,7 @@ buildPythonPackage rec {
     "test_check_yaml_returns_error_on_bad_code_block"
   ];
 
-  pythonImportsCheck = [
-    "rstcheck_core"
-  ];
+  pythonImportsCheck = [ "rstcheck_core" ];
 
   meta = with lib; {
     description = "Library for checking syntax of reStructuredText";
diff --git a/pkgs/development/python-modules/rstcheck/default.nix b/pkgs/development/python-modules/rstcheck/default.nix
index 3e648e792b20..91f58f134710 100644
--- a/pkgs/development/python-modules/rstcheck/default.nix
+++ b/pkgs/development/python-modules/rstcheck/default.nix
@@ -1,58 +1,47 @@
-{ stdenv
-, lib
-, buildPythonPackage
-, docutils
-, fetchFromGitHub
-, importlib-metadata
-, poetry-core
-, pydantic
-, pytestCheckHook
-, pythonOlder
-, pythonRelaxDepsHook
-, rstcheck-core
-, typer
-, types-docutils
-, typing-extensions
+{
+  lib,
+  stdenv,
+  buildPythonPackage,
+  docutils,
+  fetchFromGitHub,
+  setuptools,
+  setuptools-scm,
+  pydantic,
+  pytestCheckHook,
+  pythonOlder,
+  rstcheck-core,
+  typer,
+  types-docutils,
 }:
 
 buildPythonPackage rec {
   pname = "rstcheck";
-  version = "6.1.2";
-  format = "pyproject";
+  version = "6.2.1";
+  pyproject = true;
 
-  disabled = pythonOlder "3.7";
+  disabled = pythonOlder "3.8";
 
   src = fetchFromGitHub {
     owner = "rstcheck";
-    repo = pname;
+    repo = "rstcheck";
     rev = "refs/tags/v${version}";
-    hash = "sha256-UMByfnnP1va3v1IgyQL0f3kC+W6HoiWScb7U2FAvWkU=";
+    hash = "sha256-S04l+x/rIc/XSvq2lSKCQp6KK5mmKI2mOgPgJ3WKe5M=";
   };
 
-  pythonRelaxDeps = [
-    "typer"
+  build-system = [
+    setuptools
+    setuptools-scm
   ];
 
-  nativeBuildInputs = [
-    poetry-core
-    pythonRelaxDepsHook
-  ];
-
-  propagatedBuildInputs = [
+  dependencies = [
     docutils
     rstcheck-core
     types-docutils
-    typing-extensions
     pydantic
     typer
-  ] ++ lib.optionals (pythonOlder "3.8") [
-    typing-extensions
-    importlib-metadata
   ] ++ typer.optional-dependencies.all;
 
-  nativeCheckInputs = [
-    pytestCheckHook
-  ];
+  nativeCheckInputs = [ pytestCheckHook ];
 
   disabledTests = lib.optionals stdenv.isDarwin [
     # Disabled until https://github.com/rstcheck/rstcheck-core/issues/19 is resolved.
@@ -60,9 +49,7 @@ buildPythonPackage rec {
     "test_file_1_is_bad_without_config_macos"
   ];
 
-  pythonImportsCheck = [
-    "rstcheck"
-  ];
+  pythonImportsCheck = [ "rstcheck" ];
 
   preCheck = ''
     # The tests need to find and call the rstcheck executable
@@ -71,10 +58,10 @@ buildPythonPackage rec {
 
   meta = with lib; {
     description = "Checks syntax of reStructuredText and code blocks nested within it";
-    mainProgram = "rstcheck";
     homepage = "https://github.com/myint/rstcheck";
     changelog = "https://github.com/rstcheck/rstcheck/blob/v${version}/CHANGELOG.md";
     license = licenses.mit;
     maintainers = with maintainers; [ staccato ];
+    mainProgram = "rstcheck";
   };
 }