diff --git a/pkgs/development/python-modules/dataclasses-json/default.nix b/pkgs/development/python-modules/dataclasses-json/default.nix
index 36430a29ef0f0..4a2a410c4ad5f 100644
--- a/pkgs/development/python-modules/dataclasses-json/default.nix
+++ b/pkgs/development/python-modules/dataclasses-json/default.nix
@@ -1,18 +1,23 @@
 { lib
 , buildPythonPackage
-, fetchPypi
+, fetchFromGitHub
 , stringcase
 , typing-inspect
 , marshmallow-enum
+, hypothesis
+, mypy
+, pytestCheckHook
 }:
 
 buildPythonPackage rec {
   pname = "dataclasses-json";
   version = "0.5.2";
 
-  src = fetchPypi {
-    inherit pname version;
-    sha256 = "56ec931959ede74b5dedf65cf20772e6a79764d20c404794cce0111c88c085ff";
+  src = fetchFromGitHub {
+    owner = "lidatong";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "1gcnm41rwg0jvq4vhr57vv9hyasws425zl8h4p05x2nzq86l0w1n";
   };
 
   propagatedBuildInputs = [
@@ -21,6 +26,19 @@ buildPythonPackage rec {
     marshmallow-enum
   ];
 
+  checkInputs = [
+    hypothesis
+    mypy
+    pytestCheckHook
+  ];
+
+  disabledTests = [
+    # AssertionError: Type annotations check failed
+    "test_type_hints"
+  ];
+
+  pythonImportsCheck = [ "dataclasses_json" ];
+
   meta = with lib; {
     description = "Simple API for encoding and decoding dataclasses to and from JSON";
     homepage = "https://github.com/lidatong/dataclasses-json";
diff --git a/pkgs/development/python-modules/json-schema-for-humans/default.nix b/pkgs/development/python-modules/json-schema-for-humans/default.nix
index 4e762e456ceb5..085f290d5d4ce 100644
--- a/pkgs/development/python-modules/json-schema-for-humans/default.nix
+++ b/pkgs/development/python-modules/json-schema-for-humans/default.nix
@@ -1,35 +1,63 @@
-{ lib, buildPythonPackage, fetchFromGitHub
-, pbr, click, dataclasses-json, htmlmin, jinja2, markdown2, pygments, pytz, pyyaml, requests, pytestCheckHook, beautifulsoup4, tox
+{ lib
+, beautifulsoup4
+, buildPythonPackage
+, click
+, dataclasses-json
+, fetchFromGitHub
+, htmlmin
+, jinja2
+, markdown2
+, pbr
+, pygments
+, pytz
+, pyyaml
+, requests
 }:
 
 buildPythonPackage rec {
   pname = "json-schema-for-humans";
-  version = "0.27.1";
+  version = "0.31.0";
 
   src = fetchFromGitHub {
     owner = "coveooss";
     repo = pname;
     rev = "v${version}";
-    sha256 = "0d2a4a2lcqssr5g9rmc76f86nkqc9grixh507vzc9fi1h3gbi765";
+    sha256 = "1aj1w0qxdw8d6mf5vngk0xjgs7z8vzwc2aycahnkqg7q3cagq19n";
   };
 
   nativeBuildInputs = [ pbr ];
+
   propagatedBuildInputs = [
-    click dataclasses-json htmlmin jinja2 markdown2
-    pygments pytz pyyaml requests
+    click
+    dataclasses-json
+    htmlmin
+    jinja2
+    markdown2
+    pygments
+    pytz
+    pyyaml
+    requests
   ];
 
   preBuild = ''
     export PBR_VERSION=0.0.1
   '';
 
-  checkInputs = [ pytestCheckHook beautifulsoup4 ];
-  pytestFlagsArray = [ "--ignore tests/generate_test.py" ];
+  checkInputs = [
+    beautifulsoup4
+  ];
+
+  disabledTests = [
+    # Tests require network access
+    "test_references_url"
+  ];
+
+  pythonImportsCheck = [ "json_schema_for_humans" ];
 
   meta = with lib; {
     description = "Quickly generate HTML documentation from a JSON schema";
-    homepage    = "https://github.com/coveooss/json-schema-for-humans";
-    license     = licenses.asl20;
+    homepage = "https://github.com/coveooss/json-schema-for-humans";
+    license = licenses.asl20;
     maintainers = with maintainers; [ astro ];
   };
 }
diff --git a/pkgs/development/python-modules/libcst/default.nix b/pkgs/development/python-modules/libcst/default.nix
index ed6e7755bf150..643d3f2502cf9 100644
--- a/pkgs/development/python-modules/libcst/default.nix
+++ b/pkgs/development/python-modules/libcst/default.nix
@@ -1,21 +1,19 @@
 { lib
 , buildPythonPackage
+, dataclasses
 , fetchFromGitHub
-, pythonOlder
 , hypothesis
-, dataclasses
-, hypothesmith
 , pytestCheckHook
+, pythonOlder
 , pyyaml
 , typing-extensions
 , typing-inspect
-, black
-, isort
 }:
 
 buildPythonPackage rec {
   pname = "libcst";
   version = "0.3.18";
+  disabled = pythonOlder "3.6";
 
   # Some files for tests missing from PyPi
   # https://github.com/Instagram/LibCST/issues/331
@@ -26,25 +24,31 @@ buildPythonPackage rec {
     sha256 = "sha256-19yGaKBLpGASSPv/aSX0kx9lh2JxKExHJDKKtuBbuqI=";
   };
 
-  disabled = pythonOlder "3.6";
-
-  propagatedBuildInputs = [ hypothesis typing-extensions typing-inspect pyyaml ]
-    ++ lib.optional (pythonOlder "3.7") dataclasses;
+  propagatedBuildInputs = [
+    hypothesis
+    typing-extensions
+    typing-inspect
+    pyyaml
+  ] ++ lib.optional (pythonOlder "3.7") dataclasses;
 
-  checkInputs = [ black hypothesmith isort pytestCheckHook ];
-
-  # can't run tests due to circular dependency on hypothesmith -> licst
-  doCheck = false;
+  checkInputs = [
+    pytestCheckHook
+  ];
 
   preCheck = ''
-    python -m libcst.codegen.generate visitors
-    python -m libcst.codegen.generate return_types
+    # Can't run tests due to circular dependency on hypothesmith -> libcst
+    rm -r {libcst/tests,libcst/codegen/tests,libcst/m*/tests}
   '';
 
+  disabledTests = [
+    # No files are generated
+    "test_codemod_formatter_error_input"
+  ];
+
   pythonImportsCheck = [ "libcst" ];
 
   meta = with lib; {
-    description = "A Concrete Syntax Tree (CST) parser and serializer library for Python.";
+    description = "Concrete Syntax Tree (CST) parser and serializer library for Python";
     homepage = "https://github.com/Instagram/libcst";
     license = with licenses; [ mit asl20 psfl ];
     maintainers = with maintainers; [ ruuda SuperSandro2000 ];
diff --git a/pkgs/development/python-modules/typing-inspect/default.nix b/pkgs/development/python-modules/typing-inspect/default.nix
index 569096cb466c4..63a116253d89c 100644
--- a/pkgs/development/python-modules/typing-inspect/default.nix
+++ b/pkgs/development/python-modules/typing-inspect/default.nix
@@ -1,9 +1,11 @@
 { lib
 , buildPythonPackage
+, fetchpatch
 , fetchPypi
-, typing-extensions
 , mypy-extensions
-, isPy39
+, pytestCheckHook
+, typing-extensions
+, pythonAtLeast
 }:
 
 buildPythonPackage rec {
@@ -16,16 +18,26 @@ buildPythonPackage rec {
     sha256 = "1dzs9a1pr23dhbvmnvms2jv7l7jk26023g5ysf0zvnq8b791s6wg";
   };
 
+  patches = lib.optional (pythonAtLeast "3.9") [
+    (fetchpatch {
+      name = "fix-for-py39.patch";
+      url = "https://github.com/ilevkivskyi/typing_inspect/commit/16919e21936179e53df2f376c8b59b5fc44bd2dd.patch";
+      sha256 = "17gvha4z685q04lvy8r0xhddhvqh1bfk1avs5jqbwislpsd83396";
+    })
+  ];
+
   propagatedBuildInputs = [
-    typing-extensions
     mypy-extensions
+    pytestCheckHook
+    typing-extensions
   ];
 
+  pythonImportsCheck = [ "typing_inspect" ];
+
   meta = with lib; {
     description = "Runtime inspection utilities for Python typing module";
     homepage = "https://github.com/ilevkivskyi/typing_inspect";
     license = licenses.mit;
     maintainers = with maintainers; [ albakham ];
-    broken = isPy39;  # see https://github.com/ilevkivskyi/typing_inspect/issues/65
   };
 }