diff --git a/pkgs/applications/graphics/hydrus/default.nix b/pkgs/applications/graphics/hydrus/default.nix
index f4740c7d9d23..3e05dd0c025e 100644
--- a/pkgs/applications/graphics/hydrus/default.nix
+++ b/pkgs/applications/graphics/hydrus/default.nix
@@ -15,14 +15,14 @@
 
 python3Packages.buildPythonPackage rec {
   pname = "hydrus";
-  version = "591";
+  version = "595";
   format = "other";
 
   src = fetchFromGitHub {
     owner = "hydrusnetwork";
     repo = "hydrus";
     rev = "refs/tags/v${version}";
-    hash = "sha256-JhCnSNmCOEJdM5aEPpYWLpKy/EQ9BoN1A/aUAaILWtQ=";
+    hash = "sha256-bIUtFpAMCIeLAyGXi4Rgn8FmijN5NwbkC31JoVyjNdg=";
   };
 
   nativeBuildInputs = [
diff --git a/pkgs/development/python-modules/numcodecs/default.nix b/pkgs/development/python-modules/numcodecs/default.nix
index b789d8dabeeb..403d5ea16051 100644
--- a/pkgs/development/python-modules/numcodecs/default.nix
+++ b/pkgs/development/python-modules/numcodecs/default.nix
@@ -2,29 +2,35 @@
   lib,
   stdenv,
   buildPythonPackage,
-  fetchpatch,
   fetchPypi,
+  python,
+  pythonOlder,
+
+  # build-system
   setuptools,
   setuptools-scm,
   cython,
-  numpy,
-  msgpack,
   py-cpuinfo,
+
+  # dependencies
+  numpy,
+
+  # tests
+  msgpack,
   pytestCheckHook,
-  python,
-  pythonOlder,
+  importlib-metadata,
 }:
 
 buildPythonPackage rec {
   pname = "numcodecs";
-  version = "0.13.0";
+  version = "0.13.1";
   pyproject = true;
 
   disabled = pythonOlder "3.8";
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-uk+scDbqWgeMev4dTf/rloUIDULxnJwWsS2thmcDqi4=";
+    hash = "sha256-o883iB3wiY86nA1Ed9+IEz/oUYW//le6MbzC+iB3Cbw=";
   };
 
   build-system = [
@@ -41,37 +47,23 @@ buildPythonPackage rec {
     # zfpy = [ zfpy ];
   };
 
-  preBuild =
-    if (stdenv.hostPlatform.isx86 && !stdenv.hostPlatform.avx2Support) then
-      ''
-        export DISABLE_NUMCODECS_AVX2=
-      ''
-    else
-      null;
+  preBuild = lib.optionalString (stdenv.hostPlatform.isx86 && !stdenv.hostPlatform.avx2Support) ''
+    export DISABLE_NUMCODECS_AVX2=1
+  '';
 
   nativeCheckInputs = [
     pytestCheckHook
     msgpack
+    importlib-metadata
   ];
 
+  # https://github.com/NixOS/nixpkgs/issues/255262
   pytestFlagsArray = [ "$out/${python.sitePackages}/numcodecs" ];
 
-  disabledTests = [
-    "test_backwards_compatibility"
-
-    "test_encode_decode"
-    "test_legacy_codec_broken"
-    "test_bytes"
-
-    # ValueError: setting an array element with a sequence. The requested array has an inhomogeneous shape after 1 dimensions. The detected shape was (3,) + inhomogeneous part.
-    # with numpy 1.24
-    "test_non_numpy_inputs"
-  ];
-
-  meta = with lib; {
+  meta = {
     homepage = "https://github.com/zarr-developers/numcodecs";
-    license = licenses.mit;
+    license = lib.licenses.mit;
     description = "Buffer compression and transformation codecs for use in data storage and communication applications";
-    maintainers = [ ];
+    maintainers = with lib.maintainers; [ doronbehar ];
   };
 }
diff --git a/pkgs/development/python-modules/zarr/default.nix b/pkgs/development/python-modules/zarr/default.nix
index 00a1a5699495..cc38c78b3c48 100644
--- a/pkgs/development/python-modules/zarr/default.nix
+++ b/pkgs/development/python-modules/zarr/default.nix
@@ -1,15 +1,20 @@
 {
   lib,
-  asciitree,
   buildPythonPackage,
-  fasteners,
   fetchPypi,
-  numcodecs,
-  msgpack,
-  numpy,
-  pytestCheckHook,
   pythonOlder,
+
+  # build-system
   setuptools-scm,
+
+  # dependencies
+  asciitree,
+  numpy,
+  fasteners,
+  numcodecs,
+
+  # tests
+  pytestCheckHook,
 }:
 
 buildPythonPackage rec {
@@ -24,24 +29,28 @@ buildPythonPackage rec {
     hash = "sha256-JYDYy23YRiF3GhDTHE13fcqKJ3BqGomyn0LS034t9c4=";
   };
 
-  nativeBuildInputs = [ setuptools-scm ];
+  build-system = [
+    setuptools-scm
+  ];
 
-  propagatedBuildInputs = [
+  dependencies = [
     asciitree
     numpy
     fasteners
     numcodecs
   ] ++ numcodecs.optional-dependencies.msgpack;
 
-  nativeCheckInputs = [ pytestCheckHook ];
+  nativeCheckInputs = [
+    pytestCheckHook
+  ];
 
   pythonImportsCheck = [ "zarr" ];
 
-  meta = with lib; {
+  meta = {
     description = "Implementation of chunked, compressed, N-dimensional arrays for Python";
     homepage = "https://github.com/zarr-developers/zarr";
     changelog = "https://github.com/zarr-developers/zarr-python/releases/tag/v${version}";
-    license = licenses.mit;
-    maintainers = [ ];
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ doronbehar ];
   };
 }