diff --git a/pkgs/development/python-modules/pg8000/default.nix b/pkgs/development/python-modules/pg8000/default.nix
index b3ac256e0bb5..4ae1daa17951 100644
--- a/pkgs/development/python-modules/pg8000/default.nix
+++ b/pkgs/development/python-modules/pg8000/default.nix
@@ -1,6 +1,7 @@
 { lib
 , buildPythonPackage
 , fetchPypi
+, importlib-metadata
 , passlib
 , pythonOlder
 , scramp
@@ -8,21 +9,27 @@
 
 buildPythonPackage rec {
   pname = "pg8000";
-  version = "1.28.0";
-  format = "setuptools";
+  version = "1.29.1";
+  format = "pyproject";
 
-  disabled = pythonOlder "3.6";
+  disabled = pythonOlder "3.7";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "sha256-Q1E949TjeOc6xEKpOQa6qdNWJFqmeqf2FgXFbjmn9ZE=";
+    hash = "sha256-gLT03ksCVIMreUhRHg3UY0LRwERszU/diStj0C5PvHs=";
   };
 
   propagatedBuildInputs = [
     passlib
     scramp
+  ] ++ lib.optionals (pythonOlder "3.8") [
+    importlib-metadata
   ];
 
+  postPatch = ''
+    sed '/^\[metadata\]/a version = ${version}' setup.cfg
+  '';
+
   # Tests require a running PostgreSQL instance
   doCheck = false;
 
diff --git a/pkgs/development/python-modules/testing-postgresql/default.nix b/pkgs/development/python-modules/testing-postgresql/default.nix
index 7ebff6ccc365..fd88ea03bf72 100644
--- a/pkgs/development/python-modules/testing-postgresql/default.nix
+++ b/pkgs/development/python-modules/testing-postgresql/default.nix
@@ -1,32 +1,60 @@
-{ lib, buildPythonPackage, fetchFromGitHub, postgresql, testing-common-database
-, pg8000, pytestCheckHook, psycopg2, sqlalchemy }:
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, pg8000
+, postgresql
+, psycopg2
+, pytestCheckHook
+, pythonOlder
+, sqlalchemy
+, testing-common-database
+}:
 
 buildPythonPackage rec {
-  pname = "testing.postgresql";
+  pname = "testing-postgresql";
   # Version 1.3.0 isn't working so let's use the latest commit from GitHub
   version = "unstable-2017-10-31";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.7";
 
   src = fetchFromGitHub {
     owner = "tk0miya";
-    repo = pname;
+    repo = "testing.postgresql";
     rev = "c81ded434d00ec8424de0f9e1f4063c778c6aaa8";
-    sha256 = "1asqsi38di768i1sc1qm1k068dj0906ds6lnx7xcbxws0s25m2q3";
+    sha256 = "sha256-A4tahAaa98X66ZYa3QxIQDZkwAwVB6ZDRObEhkbUWKs=";
   };
 
+  propagatedBuildInputs = [
+    testing-common-database
+    pg8000
+  ];
+
+  checkInputs = [
+    pytestCheckHook
+    psycopg2
+    sqlalchemy
+  ];
+
   # Add PostgreSQL to search path
   prePatch = ''
     substituteInPlace src/testing/postgresql.py \
       --replace "/usr/local/pgsql" "${postgresql}"
   '';
 
-  propagatedBuildInputs = [ testing-common-database pg8000 ];
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace "pg8000 >= 1.10" "pg8000"
+  '';
+
+  pythonImportsCheck = [
+    "testing.postgresql"
+  ];
 
   # Fix tests for Darwin build. See:
   # https://github.com/NixOS/nixpkgs/pull/74716#issuecomment-598546916
   __darwinAllowLocalNetworking = true;
 
-  checkInputs = [ pytestCheckHook psycopg2 sqlalchemy ];
-
   meta = with lib; {
     description = "Use temporary postgresql instance in testing";
     homepage = "https://github.com/tk0miya/testing.postgresql";