diff --git a/pkgs/development/python-modules/pydantic/default.nix b/pkgs/development/python-modules/pydantic/default.nix
index 9bf4bede1faf..d3c6e37bbe4b 100644
--- a/pkgs/development/python-modules/pydantic/default.nix
+++ b/pkgs/development/python-modules/pydantic/default.nix
@@ -1,44 +1,45 @@
 { lib
 , buildPythonPackage
-, fetchFromGitHub
-, ujson
 , email_validator
-, typing-extensions
-, python
-, isPy3k
-, pytest
-, pytestcov
+, fetchFromGitHub
 , pytest-mock
+, pytestCheckHook
+, python-dotenv
+, pythonOlder
+, typing-extensions
+, ujson
 }:
 
 buildPythonPackage rec {
   pname = "pydantic";
-  version = "1.7.3";
-  disabled = !isPy3k;
+  version = "1.8";
+  disabled = pythonOlder "3.7";
 
   src = fetchFromGitHub {
     owner = "samuelcolvin";
     repo = pname;
     rev = "v${version}";
-    sha256 = "xihEDmly0vprmA+VdeCoGXg9PjWRPmBWAwk/9f2DLts=";
+    sha256 = "sha256-+HfnM/IrFlUyQJdiOYyaJUNenh8dLtd8CUJWSbn6hwQ=";
   };
 
   propagatedBuildInputs = [
-    ujson
     email_validator
+    python-dotenv
     typing-extensions
+    ujson
   ];
 
   checkInputs = [
-    pytest
-    pytestcov
     pytest-mock
+    pytestCheckHook
   ];
 
-  checkPhase = ''
-    pytest
+  preCheck = ''
+    export HOME=$(mktemp -d)
   '';
 
+  pythonImportsCheck = [ "pydantic" ];
+
   meta = with lib; {
     homepage = "https://github.com/samuelcolvin/pydantic";
     description = "Data validation and settings management using Python type hinting";
diff --git a/pkgs/development/python-modules/python-dotenv/default.nix b/pkgs/development/python-modules/python-dotenv/default.nix
index e654826e0bc2..1d8a9a85457b 100644
--- a/pkgs/development/python-modules/python-dotenv/default.nix
+++ b/pkgs/development/python-modules/python-dotenv/default.nix
@@ -1,29 +1,38 @@
-{ lib, buildPythonPackage, fetchPypi, isPy27
+{ lib
+, buildPythonPackage
 , click
+, fetchPypi
 , ipython
-, pytest
-, sh
-, typing
 , mock
+, pytestCheckHook
+, pythonOlder
+, sh
 }:
 
 buildPythonPackage rec {
   pname = "python-dotenv";
   version = "0.15.0";
+  disabled = pythonOlder "3.5";
 
   src = fetchPypi {
     inherit pname version;
     sha256 = "587825ed60b1711daea4832cf37524dfd404325b7db5e25ebe88c495c9f807a0";
   };
 
-  propagatedBuildInputs = [ click ] ++ lib.optionals isPy27 [ typing ];
+  propagatedBuildInputs = [ click ];
 
-  checkInputs = [ ipython mock pytest sh ];
+  checkInputs = [
+    ipython
+    mock
+    pytestCheckHook
+    sh
+  ];
 
-  # cli tests are impure
-  checkPhase = ''
-    pytest tests/ -k 'not cli'
-  '';
+  disabledTests = [
+    "cli"
+  ];
+
+  pythonImportsCheck = [ "dotenv" ];
 
   meta = with lib; {
     description = "Add .env support to your django/flask apps in development and deployments";