diff --git a/pkgs/development/python-modules/importlib-metadata/default.nix b/pkgs/development/python-modules/importlib-metadata/default.nix
index e13f73616775a..a607de5eb114d 100644
--- a/pkgs/development/python-modules/importlib-metadata/default.nix
+++ b/pkgs/development/python-modules/importlib-metadata/default.nix
@@ -10,15 +10,15 @@
 
 buildPythonPackage rec {
   pname = "importlib-metadata";
-  version = "4.8.2";
+  version = "4.10.0";
   format = "setuptools";
 
-  disabled = pythonOlder "3.6";
+  disabled = pythonOlder "3.7";
 
   src = fetchPypi {
     pname = "importlib_metadata";
     inherit version;
-    sha256 = "sha256-db3sFMOX9ShyTBv9lwnWYLM6TS53OHozWPILhIu15fs=";
+    hash = "sha256-kqi1jOc0sqRJSHjg7PfXnM16EotfxgFMQB4LYfAG8PY=";
   };
 
   nativeBuildInputs = [
diff --git a/pkgs/development/python-modules/pytenable/default.nix b/pkgs/development/python-modules/pytenable/default.nix
index af3c2c9b6514f..e4417139bfa34 100644
--- a/pkgs/development/python-modules/pytenable/default.nix
+++ b/pkgs/development/python-modules/pytenable/default.nix
@@ -9,6 +9,7 @@
 , pytestCheckHook
 , python-box
 , python-dateutil
+, pythonOlder
 , requests
 , requests-pkcs12
 , responses
@@ -19,13 +20,16 @@
 
 buildPythonPackage rec {
   pname = "pytenable";
-  version = "1.4.2";
+  version = "1.4.3";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.7";
 
   src = fetchFromGitHub {
     owner = "tenable";
     repo = "pyTenable";
     rev = version;
-    sha256 = "sha256-qljoJ+nYFVS5VHr/M4mITtO9Czuyb4HLzVjhprhyJIs=";
+    hash = "sha256-p9d3wZkOMhNQWJN6tCNUlW15A3irU8QN/nm7PLGTE/M=";
   };
 
   propagatedBuildInputs = [
@@ -59,7 +63,9 @@ buildPythonPackage rec {
     "test_uploads_docker_push_cs_tag_typeerror"
   ];
 
-  pythonImportsCheck = [ "tenable" ];
+  pythonImportsCheck = [
+    "tenable"
+  ];
 
   meta = with lib; {
     description = "Python library for the Tenable.io and TenableSC API";
diff --git a/pkgs/development/python-modules/restfly/default.nix b/pkgs/development/python-modules/restfly/default.nix
index 8b47183dcfd35..0732974124942 100644
--- a/pkgs/development/python-modules/restfly/default.nix
+++ b/pkgs/development/python-modules/restfly/default.nix
@@ -6,18 +6,22 @@
 , pytest-vcr
 , pytestCheckHook
 , python-box
+, pythonOlder
 , requests
 }:
 
 buildPythonPackage rec {
   pname = "restfly";
   version = "1.4.4";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.7";
 
   src = fetchFromGitHub {
     owner = "stevemcgrath";
     repo = pname;
     rev = version;
-    sha256 = "sha256-T5NfG+Vuguh6xZ/Rdx3a1vMDgXPcl/OYhOkxb76yEXg=";
+    hash = "sha256-T5NfG+Vuguh6xZ/Rdx3a1vMDgXPcl/OYhOkxb76yEXg=";
   };
 
   propagatedBuildInputs = [
@@ -37,7 +41,9 @@ buildPythonPackage rec {
     "test_session_ssl_error"
   ];
 
-  pythonImportsCheck = [ "restfly" ];
+  pythonImportsCheck = [
+    "restfly"
+  ];
 
   meta = with lib; {
     description = "Python RESTfly API Library Framework";
diff --git a/pkgs/development/python-modules/typing-extensions/default.nix b/pkgs/development/python-modules/typing-extensions/default.nix
index 939ca25eb1a31..1e29bc9a6160c 100644
--- a/pkgs/development/python-modules/typing-extensions/default.nix
+++ b/pkgs/development/python-modules/typing-extensions/default.nix
@@ -1,27 +1,41 @@
-{ lib, buildPythonPackage, fetchPypi, pythonOlder, isPy3k, python, typing }:
-let
-  testDir = if isPy3k then "src_py3" else "src_py2";
+{ lib
+, buildPythonPackage
+, fetchPypi
+, flit-core
+, python
+, pythonOlder
+}:
 
-in buildPythonPackage rec {
-  pname = "typing_extensions";
-  version = "3.10.0.2";
+buildPythonPackage rec {
+  pname = "typing-extensions";
+  version = "4.0.1";
+  format = "pyproject";
+
+  disabled = pythonOlder "3.6";
 
   src = fetchPypi {
-    inherit pname version;
-    sha256 = "49f75d16ff11f1cd258e1b988ccff82a3ca5570217d7ad8c5f48205dd99a677e";
+    pname = "typing_extensions";
+    inherit version;
+    hash = "sha256-TKCR3qFJ+UXsVq+0ja5xTyHoaS7yKjlSI7zTKJYbag4=";
   };
 
-  checkInputs = lib.optional (pythonOlder "3.5") typing;
-
-  # Error for Python3.6: ImportError: cannot import name 'ann_module'
-  # See https://github.com/python/typing/pull/280
-  doCheck = pythonOlder "3.6";
+  nativeBuildInputs = [
+    flit-core
+  ];
 
-  checkPhase = ''
-    cd ${testDir}
-    ${python.interpreter} -m unittest discover
+  postPatch = ''
+    # Remove metadata for README which are outdated
+    sed -i -e '11,24d' pyproject.toml
   '';
 
+  # Tests are not part of PyPI releases. GitHub source can't be used
+  # as it ends with an infinite recursion
+  doCheck = false;
+
+  pythonImportsCheck = [
+    "typing_extensions"
+  ];
+
   meta = with lib; {
     description = "Backported and Experimental Type Hints for Python 3.5+";
     homepage = "https://github.com/python/typing";