diff --git a/pkgs/development/python-modules/gdsfactory/default.nix b/pkgs/development/python-modules/gdsfactory/default.nix
index b2282a04a1c0..0499fd810b80 100644
--- a/pkgs/development/python-modules/gdsfactory/default.nix
+++ b/pkgs/development/python-modules/gdsfactory/default.nix
@@ -2,8 +2,11 @@
   lib,
   buildPythonPackage,
   fetchFromGitHub,
-  pytestCheckHook,
+
+  # build-system
   flit-core,
+
+  # dependencies
   jinja2,
   loguru,
   matplotlib,
@@ -32,21 +35,25 @@
   ipykernel,
   attrs,
   graphviz,
+  pyglet,
+  typing-extensions,
+
   # tests
   jsondiff,
   jsonschema,
   pytest-regressions,
+  pytestCheckHook,
 }:
 buildPythonPackage rec {
   pname = "gdsfactory";
-  version = "8.18.1";
+  version = "9.5.1";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "gdsfactory";
     repo = "gdsfactory";
-    rev = "v${version}";
-    hash = "sha256-wDz8QpRgu40FB8+otnGsHVn2e6/SWXIZgA1aeMqMhPQ=";
+    tag = "v${version}";
+    hash = "sha256-z8zKPbWLl554MZq6/Iy3ecvwWiRpy57VYji8xHR+JBo=";
   };
 
   build-system = [ flit-core ];
@@ -80,13 +87,15 @@ buildPythonPackage rec {
     ipykernel
     attrs
     graphviz
+    pyglet
+    typing-extensions
   ];
 
   nativeCheckInputs = [
     jsondiff
     jsonschema
-    pytestCheckHook
     pytest-regressions
+    pytestCheckHook
   ];
 
   pythonRelaxDeps = [
@@ -99,10 +108,11 @@ buildPythonPackage rec {
 
   pythonImportsCheck = [ "gdsfactory" ];
 
-  meta = with lib; {
+  meta = {
     description = "Python library to generate GDS layouts";
     homepage = "https://github.com/gdsfactory/gdsfactory";
-    license = licenses.mit;
-    maintainers = with maintainers; [ fbeffa ];
+    changelog = "https://github.com/gdsfactory/gdsfactory/blob/v${version}/CHANGELOG.md";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ fbeffa ];
   };
 }
diff --git a/pkgs/development/python-modules/kfactory/default.nix b/pkgs/development/python-modules/kfactory/default.nix
index 3652d517d048..2f661515e329 100644
--- a/pkgs/development/python-modules/kfactory/default.nix
+++ b/pkgs/development/python-modules/kfactory/default.nix
@@ -2,37 +2,43 @@
   lib,
   buildPythonPackage,
   fetchFromGitHub,
-  pytestCheckHook,
+
+  # build-system
   setuptools,
   setuptools-scm,
-  klayout,
+
+  # dependencies
   aenum,
   cachetools,
   gitpython,
+  klayout,
   loguru,
+  numpy,
   pydantic,
   pydantic-settings,
   rectangle-packer,
   requests,
+  ruamel-yaml,
   ruamel-yaml-string,
   scipy,
   tomli,
   toolz,
   typer,
-  numpy,
-  ruamel-yaml,
+
+  # tests
+  pytestCheckHook,
 }:
 
 buildPythonPackage rec {
   pname = "kfactory";
-  version = "0.21.7";
+  version = "1.4.4";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "gdsfactory";
     repo = "kfactory";
-    rev = "v${version}";
-    sha256 = "sha256-VLhAJ5rOBKEO1FDCnlaseA+SmrMSoyS+BaEzjdHm59Y=";
+    tag = "v${version}";
+    hash = "sha256-/dhlAcrqQP/YeKGhnBAVMEy80X3yShn65ywoZMRU/ZM=";
   };
 
   build-system = [
@@ -63,15 +69,16 @@ buildPythonPackage rec {
 
   nativeCheckInputs = [ pytestCheckHook ];
 
-  # https://github.com/gdsfactory/kfactory/issues/511
   disabledTestPaths = [
+    # https://github.com/gdsfactory/kfactory/issues/511
     "tests/test_pdk.py"
   ];
 
-  meta = with lib; {
+  meta = {
     description = "KLayout API implementation of gdsfactory";
     homepage = "https://github.com/gdsfactory/kfactory";
-    license = licenses.mit;
-    maintainers = with maintainers; [ fbeffa ];
+    changelog = "https://github.com/gdsfactory/kfactory/blob/v${version}/CHANGELOG.md";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ fbeffa ];
   };
 }