diff --git a/pkgs/development/python-modules/seedir/default.nix b/pkgs/development/python-modules/seedir/default.nix
new file mode 100644
index 000000000000..8aadab61cac8
--- /dev/null
+++ b/pkgs/development/python-modules/seedir/default.nix
@@ -0,0 +1,46 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, natsort
+, pytestCheckHook
+, pythonOlder
+}:
+
+buildPythonPackage rec {
+  pname = "seedir";
+  version = "0.4.2";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.8";
+
+  src = fetchFromGitHub {
+    owner = "earnestt1234";
+    repo = pname;
+    rev = "refs/tags/v${version}";
+    sha256 = "sha256-ioez5lBNyiBK3poL2Px3KtCQeM+Gh2d4iD3SoAIHFAk=";
+  };
+
+  propagatedBuildInputs = [
+    natsort
+  ];
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [
+    "seedir"
+  ];
+
+  pytestFlagsArray = [
+    "tests/tests.py"
+  ];
+
+  meta = with lib; {
+    description = "Module for for creating, editing, and reading folder tree diagrams";
+    homepage = "https://github.com/earnestt1234/seedir";
+    changelog = "https://github.com/earnestt1234/seedir/releases/tag/v${version}";
+    license = with licenses; [ mit ];
+    maintainers = with maintainers; [ fab ];
+  };
+}
diff --git a/pkgs/development/python-modules/sybil/default.nix b/pkgs/development/python-modules/sybil/default.nix
index 2667f0af5464..d1bb2994f779 100644
--- a/pkgs/development/python-modules/sybil/default.nix
+++ b/pkgs/development/python-modules/sybil/default.nix
@@ -1,31 +1,26 @@
 { lib
 , buildPythonPackage
-, fetchPypi
+, fetchFromGitHub
 , pytestCheckHook
 , pythonOlder
 }:
 
 buildPythonPackage rec {
   pname = "sybil";
-  version = "3.0.1";
+  version = "4.0.0";
   format = "setuptools";
 
   disabled = pythonOlder "3.6";
 
-  src = fetchPypi {
-    inherit pname version;
-    hash = "sha256-bwLcIgSvflohIDeSTZdPcngfbcGP08RMx85GOhIPUw0=";
+  src = fetchFromGitHub {
+    owner = "simplistix";
+    repo = pname;
+    rev = "refs/tags/${version}";
+    hash = "sha256-9fXvQfVS3IVdOV4hbA0bEYFJU7uK0WpqJKMNBltqFTI=";
   };
 
-  checkInputs = [
-    pytestCheckHook
-  ];
-
-  disabledTests = [
-    # Sensitive to output of other commands
-    "test_namespace"
-    "test_unittest"
-  ];
+  # Circular dependency with testfixtures
+  doCheck = false;
 
   pythonImportsCheck = [
     "sybil"
@@ -34,6 +29,7 @@ buildPythonPackage rec {
   meta = with lib; {
     description = "Automated testing for the examples in your documentation";
     homepage = "https://github.com/cjw296/sybil";
+    changelog = "https://github.com/simplistix/sybil/blob/${version}/CHANGELOG.rst";
     license = licenses.mit;
     maintainers = with maintainers; [ ];
   };
diff --git a/pkgs/development/python-modules/testfixtures/default.nix b/pkgs/development/python-modules/testfixtures/default.nix
index 9f0de060d7d4..19f9ef7eadcb 100644
--- a/pkgs/development/python-modules/testfixtures/default.nix
+++ b/pkgs/development/python-modules/testfixtures/default.nix
@@ -12,7 +12,7 @@
 
 buildPythonPackage rec {
   pname = "testfixtures";
-  version = "7.0.0";
+  version = "7.0.4";
   format = "setuptools";
   # DO NOT CONTACT upstream.
   # https://github.com/simplistix/ is only concerned with internal CI process.
@@ -25,7 +25,7 @@ buildPythonPackage rec {
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-jsrFowh5NFFkBZTZykLOibmHcR4eTJMShVMh7CH2zLQ=";
+    hash = "sha256-xSaqiXjBAC8FnxUsSt43WMShJBjfqyspdUrmIwyvPQQ=";
   };
 
   checkInputs = [
@@ -52,6 +52,7 @@ buildPythonPackage rec {
   meta = with lib; {
     description = "Collection of helpers and mock objects for unit tests and doc tests";
     homepage = "https://github.com/Simplistix/testfixtures";
+    changelog = "https://github.com/simplistix/testfixtures/blob/${version}/CHANGELOG.rst";
     license = licenses.mit;
     maintainers = with maintainers; [ siriobalmelli ];
   };
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 39a9447ef058..0753f6dd88e6 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -10185,6 +10185,8 @@ self: super: with self; {
 
   securetar = callPackage ../development/python-modules/securetar { };
 
+  seedir = callPackage ../development/python-modules/seedir { };
+
   seekpath = callPackage ../development/python-modules/seekpath { };
 
   segments = callPackage ../development/python-modules/segments { };