diff --git a/pkgs/development/python-modules/fnllm/default.nix b/pkgs/development/python-modules/fnllm/default.nix
index df778008efef..94f182abc218 100644
--- a/pkgs/development/python-modules/fnllm/default.nix
+++ b/pkgs/development/python-modules/fnllm/default.nix
@@ -1,34 +1,42 @@
 {
   lib,
-  aiolimiter,
-  azure-identity,
-  azure-storage-blob,
   buildPythonPackage,
   fetchPypi,
+  pythonAtLeast,
+
+  # build-system
   hatchling,
+  uv-dynamic-versioning,
+
+  # dependencies
+  aiolimiter,
   httpx,
   json-repair,
-  openai,
-  polyfactory,
   pydantic,
+  tenacity,
+
+  # optional-dependencies
+  # azure
+  azure-identity,
+  azure-storage-blob,
+  # openai
+  openai,
+  tiktoken,
+
+  # tests
+  polyfactory,
   pytest-asyncio,
   pytest-cov-stub,
   pytestCheckHook,
-  pythonOlder,
-  tenacity,
-  tiktoken,
-  uv-dynamic-versioning,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "fnllm";
   version = "0.4.1";
   pyproject = true;
 
-  disabled = pythonOlder "3.11";
-
   src = fetchPypi {
-    inherit pname version;
+    inherit (finalAttrs) pname version;
     hash = "sha256-gKdFBpNpG/CDLhKi1wQgZHv+o1pDy5HEqcteLzkXK1A=";
   };
 
@@ -62,7 +70,7 @@ buildPythonPackage rec {
     pytest-cov-stub
     pytestCheckHook
   ]
-  ++ lib.concatAttrValues optional-dependencies;
+  ++ lib.concatAttrValues finalAttrs.passthru.optional-dependencies;
 
   pythonImportsCheck = [ "fnllm" ];
 
@@ -81,6 +89,10 @@ buildPythonPackage rec {
     "test_clear"
     "test_handles_common_errors"
     "test_children"
+  ]
+  ++ lib.optionals (pythonAtLeast "3.14") [
+    # RuntimeError: There is no current event loop in thread 'MainThread'
+    "test_call_batch_raises_if_response_length_mismatch"
   ];
 
   meta = {
@@ -89,4 +101,4 @@ buildPythonPackage rec {
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ fab ];
   };
-}
+})
diff --git a/pkgs/development/python-modules/litestar/default.nix b/pkgs/development/python-modules/litestar/default.nix
index 06bc2b7720ff..2b1da81ceb9a 100644
--- a/pkgs/development/python-modules/litestar/default.nix
+++ b/pkgs/development/python-modules/litestar/default.nix
@@ -2,6 +2,7 @@
   lib,
   buildPythonPackage,
   fetchFromGitHub,
+  pythonAtLeast,
 
   # build-system
   hatchling,
@@ -31,7 +32,6 @@
   prometheus-client,
   psutil,
   opentelemetry-instrumentation-asgi,
-  psycopg,
   pydantic-extra-types,
   pydantic,
   email-validator,
@@ -47,6 +47,7 @@
   # valkey,
 
   # tests
+  addBinToPathHook,
   httpx-sse,
   pytest-asyncio,
   pytest-lazy-fixtures,
@@ -59,7 +60,7 @@
   versionCheckHook,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "litestar";
   version = "2.18.0";
   pyproject = true;
@@ -67,7 +68,7 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "litestar-org";
     repo = "litestar";
-    tag = "v${version}";
+    tag = "v${finalAttrs.version}";
     hash = "sha256-bqj7tvCNeMEEJKDF3g2beKfd0urbNszrbLdF96JygYk=";
   };
 
@@ -127,6 +128,7 @@ buildPythonPackage rec {
   };
 
   nativeCheckInputs = [
+    addBinToPathHook
     httpx-sse
     pytest-asyncio
     pytest-lazy-fixtures
@@ -144,15 +146,16 @@ buildPythonPackage rec {
 
   __darwinAllowLocalNetworking = true;
 
-  preCheck = ''
-    export PATH=$out/bin:$PATH
-  '';
-
   enabledTestPaths = [
     # Follow GitHub CI
     "docs/examples/"
   ];
 
+  pytestFlags = lib.optionals (pythonAtLeast "3.14") [
+    # UserWarning: Core Pydantic V1 functionality isn't compatible with Python 3.14 or greater.
+    "-Wignore::UserWarning"
+  ];
+
   disabledTests = [
     # StartupError
     "test_subprocess_async_client"
@@ -161,10 +164,10 @@ buildPythonPackage rec {
   meta = {
     description = "Production-ready, Light, Flexible and Extensible ASGI API framework";
     homepage = "https://litestar.dev/";
-    changelog = "https://github.com/litestar-org/litestar/releases/tag/${src.tag}";
+    changelog = "https://github.com/litestar-org/litestar/releases/tag/${finalAttrs.src.tag}";
     license = lib.licenses.mit;
     mainProgram = "litestar";
     maintainers = with lib.maintainers; [ bot-wxt1221 ];
     platforms = lib.platforms.unix;
   };
-}
+})
diff --git a/pkgs/development/python-modules/polyfactory/default.nix b/pkgs/development/python-modules/polyfactory/default.nix
index 91b6ba6eb535..3a1208d79cc8 100644
--- a/pkgs/development/python-modules/polyfactory/default.nix
+++ b/pkgs/development/python-modules/polyfactory/default.nix
@@ -1,22 +1,29 @@
 {
-  buildPythonPackage,
   lib,
+  buildPythonPackage,
   fetchFromGitHub,
+  pythonAtLeast,
+
+  # build-system
   hatchling,
-  hypothesis,
-  faker,
-  msgspec,
-  sqlalchemy,
+
+  # dependencies
   aiosqlite,
-  typing-extensions,
-  pymongo,
-  pytest-asyncio,
-  pydantic,
-  pytestCheckHook,
   email-validator,
+  faker,
+  hypothesis,
+  msgspec,
+  pydantic,
+  pymongo,
+  sqlalchemy,
+  typing-extensions,
+
+  # tests
+  pytest-asyncio,
+  pytestCheckHook,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "polyfactory";
   version = "3.2.0";
   pyproject = true;
@@ -24,22 +31,22 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "litestar-org";
     repo = "polyfactory";
-    tag = "v${version}";
+    tag = "v${finalAttrs.version}";
     hash = "sha256-J/CHf85jomybMp2U9l5kbD5q0MtYlY9hZkjxjS2jXvg=";
   };
 
   build-system = [ hatchling ];
 
   dependencies = [
-    faker
-    typing-extensions
-    hypothesis
-    pydantic
-    sqlalchemy
-    msgspec
-    pymongo
     aiosqlite
     email-validator
+    faker
+    hypothesis
+    msgspec
+    pydantic
+    pymongo
+    sqlalchemy
+    typing-extensions
   ];
 
   nativeCheckInputs = [
@@ -48,14 +55,35 @@ buildPythonPackage rec {
   ];
 
   disabledTestPaths = [
+    # Requires unpackaged 'beanie'
     "tests/test_beanie_factory.py"
   ];
 
+  enabledTestPaths = [
+    "tests/test_msgspec_factory.py"
+  ];
+
   disabledTests = [
     # Unsupported type: LiteralAlias
     "test_type_alias"
     # Unsupported type: 'JsonValue' on field '' from class RecursiveTypeModelFactory.
     "test_recursive_type_annotation"
+  ]
+  ++ lib.optionals (pythonAtLeast "3.14") [
+    # AttributeError: 'Foo' object has no attribute 'set_field'
+    "test_other_basic_types"
+
+    # KeyError: 'foo_field'
+    "test_with_nested_struct"
+
+    # AttributeError: 'Foo' object has no attribute 'unset'
+    "test_msgspec_types"
+
+    # Failed: DID NOT RAISE <class 'polyfactory.exceptions.ParameterException'>
+    "test_datetime_constraints"
+
+    # assert <msgspec._core.Field object at 0x7ffff34794c0> == 10
+    "test_use_default_with_callable_default"
   ];
 
   pythonImportsCheck = [ "polyfactory" ];
@@ -64,8 +92,8 @@ buildPythonPackage rec {
     homepage = "https://polyfactory.litestar.dev/";
     platforms = lib.platforms.unix;
     maintainers = with lib.maintainers; [ bot-wxt1221 ];
-    changelog = "https://github.com/litestar-org/polyfactory/releases/tag/${src.tag}";
+    changelog = "https://github.com/litestar-org/polyfactory/releases/tag/${finalAttrs.src.tag}";
     description = "Simple and powerful factories for mock data generation";
     license = lib.licenses.mit;
   };
-}
+})