diff --git a/.github/workflows/ci-black-formatting.yaml b/.github/workflows/ci-black-formatting.yaml
index 283acd56bc..90a0b95431 100644
--- a/.github/workflows/ci-black-formatting.yaml
+++ b/.github/workflows/ci-black-formatting.yaml
@@ -14,7 +14,7 @@ jobs:
       - name: Action - install python
         uses: actions/setup-python@v6
         with:
-          python-version: "3.9"
+          python-version: "3.10"
 
       - name: Action - install python
         uses: actions/setup-python@v6
@@ -33,7 +33,7 @@ jobs:
         id: syntax-errors
         run: |
           ERROR=0
-          python3.9 -W error -m compileall -q src/ifcopenshell-python || ERROR=1
+          python3.10 -W error -m compileall -q src/ifcopenshell-python || ERROR=1
           python3.11 -W error -m compileall -q src/bonsai || ERROR=1
           exit $ERROR
         continue-on-error: true
diff --git a/nix/build-all.py b/nix/build-all.py
index 3bd12885c3..0b159d1e9f 100644
--- a/nix/build-all.py
+++ b/nix/build-all.py
@@ -139,7 +139,7 @@ PROJECT_NAME = "IfcOpenShell"
 USE_CURRENT_PYTHON_VERSION = os.getenv("USE_CURRENT_PYTHON_VERSION")
 ADD_COMMIT_SHA = os.getenv("ADD_COMMIT_SHA")
 
-PYTHON_VERSIONS = ["3.9.11", "3.10.3", "3.11.8", "3.12.1", "3.13.6", "3.14.0"]
+PYTHON_VERSIONS = ["3.10.3", "3.11.8", "3.12.1", "3.13.6", "3.14.0"]
 JSON_VERSION = "3.11.3"
 OCE_VERSION = "0.18.3"
 OCCT_VERSION = "7.8.1"
diff --git a/src/bsdd/pyproject.toml b/src/bsdd/pyproject.toml
index 76e0e5353a..d64d667a20 100644
--- a/src/bsdd/pyproject.toml
+++ b/src/bsdd/pyproject.toml
@@ -10,15 +10,16 @@ authors = [
 ]
 description = "Library to interact with the buildingSMART Data Dictionary"
 readme = "README.md"
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 keywords = ["IFC", "bSDD", "BIM"]
 classifiers = [
     "Development Status :: 4 - Beta",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Programming Language :: Python :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: PyPy",
     "License :: OSI Approved :: GNU Lesser General Public License v3 or later (LGPLv3+)",
diff --git a/src/ifcopenshell-python/docs/ifcopenshell-python/installation.rst b/src/ifcopenshell-python/docs/ifcopenshell-python/installation.rst
index 9ff9b917e2..8d75712f71 100644
--- a/src/ifcopenshell-python/docs/ifcopenshell-python/installation.rst
+++ b/src/ifcopenshell-python/docs/ifcopenshell-python/installation.rst
@@ -34,8 +34,6 @@ ZIP packages
    +-------------+---------------------------------+-------------------------------+---------------------------------+-----------------------------------+
    |             | Linux 64bit                     | Windows 64bit                 | MacOS Intel 64bit               | MacOS Silicon 64bit               |
    +=============+=================================+===============================+=================================+===================================+
-   | Python 3.9  | :ios_python_url:`py39-linux64`  | :ios_python_url:`py39-win64`  | :ios_python_url:`py39-macos64`  | :ios_python_url:`py39-macosm164`  |
-   +-------------+---------------------------------+-------------------------------+---------------------------------+-----------------------------------+
    | Python 3.10 | :ios_python_url:`py310-linux64` | :ios_python_url:`py310-win64` | :ios_python_url:`py310-macos64` | :ios_python_url:`py310-macosm164` |
    +-------------+---------------------------------+-------------------------------+---------------------------------+-----------------------------------+
    | Python 3.11 | :ios_python_url:`py311-linux64` | :ios_python_url:`py311-win64` | :ios_python_url:`py311-macos64` | :ios_python_url:`py311-macosm164` |
diff --git a/src/ifcopenshell-python/ifcopenshell/api/__init__.py b/src/ifcopenshell-python/ifcopenshell/api/__init__.py
index 0eb95b2c65..85e60be9c2 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/__init__.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/__init__.py
@@ -43,7 +43,8 @@ import numpy
 import inspect
 import importlib
 import ifcopenshell
-from typing import Callable, Any, Optional, TYPE_CHECKING
+from collections.abc import Callable
+from typing import Any, Optional, TYPE_CHECKING
 from functools import partial
 
 if TYPE_CHECKING:
diff --git a/src/ifcopenshell-python/ifcopenshell/api/attribute/edit_attributes.py b/src/ifcopenshell-python/ifcopenshell/api/attribute/edit_attributes.py
index 6199ddf3b7..85cd3aa646 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/attribute/edit_attributes.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/attribute/edit_attributes.py
@@ -20,11 +20,7 @@ import sys
 import ifcopenshell.api.owner
 import ifcopenshell.util.element
 from typing import Any, Union
-
-if sys.version_info >= (3, 10):
-    from types import EllipsisType
-else:
-    EllipsisType = type(...)
+from types import EllipsisType
 
 
 def edit_attributes(file: ifcopenshell.file, product: ifcopenshell.entity_instance, attributes: dict[str, Any]) -> None:
diff --git a/src/ifcopenshell-python/ifcopenshell/api/project/append_asset.py b/src/ifcopenshell-python/ifcopenshell/api/project/append_asset.py
index 22eb022e99..2de3352e79 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/project/append_asset.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/project/append_asset.py
@@ -27,7 +27,8 @@ import ifcopenshell.util.element
 import ifcopenshell.util.geolocation
 import ifcopenshell.util.placement
 import ifcopenshell.util.unit
-from typing import Optional, Any, Union, Literal, get_args, Callable
+from typing import Optional, Any, Union, Literal, get_args
+from collections.abc import Callable
 from functools import partial
 
 
diff --git a/src/ifcopenshell-python/ifcopenshell/util/element.py b/src/ifcopenshell-python/ifcopenshell/util/element.py
index 067febd115..9421bc9760 100644
--- a/src/ifcopenshell-python/ifcopenshell/util/element.py
+++ b/src/ifcopenshell-python/ifcopenshell/util/element.py
@@ -20,8 +20,8 @@ import ifcopenshell
 import ifcopenshell.guid
 import ifcopenshell.util.element
 import ifcopenshell.util.representation
-from typing import Any, Callable, Optional, Union, Literal, overload
-from collections.abc import Generator, Sequence
+from typing import Any, Optional, Union, Literal, overload
+from collections.abc import Callable, Generator, Sequence
 from collections import namedtuple
 
 
diff --git a/src/ifcopenshell-python/ifcopenshell/util/mvd_info.py b/src/ifcopenshell-python/ifcopenshell/util/mvd_info.py
index a4ca36039d..cae535698e 100644
--- a/src/ifcopenshell-python/ifcopenshell/util/mvd_info.py
+++ b/src/ifcopenshell-python/ifcopenshell/util/mvd_info.py
@@ -26,7 +26,7 @@ try:
 except ImportError:
     LARK_AVAILABLE = False
 
-from typing import Callable, Union
+from typing import Union
 import re
 
 if LARK_AVAILABLE:
@@ -51,9 +51,9 @@ if LARK_AVAILABLE:
 
         value: /[A-Za-z0-9 _\.-]+/
 
-        other_keyword: /[^\[\]]+/  
-        
-        dynamic_option_word: /[^\[\]]+/ 
+        other_keyword: /[^\[\]]+/
+
+        dynamic_option_word: /[^\[\]]+/
 
         %import common.WS
         %ignore WS
diff --git a/src/ifcopenshell-python/ifcopenshell/util/selector.py b/src/ifcopenshell-python/ifcopenshell/util/selector.py
index a2ce6fb467..7b0acfef7f 100644
--- a/src/ifcopenshell-python/ifcopenshell/util/selector.py
+++ b/src/ifcopenshell-python/ifcopenshell/util/selector.py
@@ -37,11 +37,7 @@ import ifcopenshell.util.unit
 from decimal import Decimal
 from typing import Optional, Any, Union
 from collections.abc import Iterable
-
-if sys.version_info >= (3, 10):
-    from types import EllipsisType
-else:
-    EllipsisType = type(...)
+from types import EllipsisType
 
 
 filter_elements_grammar = lark.Lark(
diff --git a/src/ifcopenshell-python/ifcopenshell/validate.py b/src/ifcopenshell-python/ifcopenshell/validate.py
index 25f9b3a685..526d1a1db7 100644
--- a/src/ifcopenshell-python/ifcopenshell/validate.py
+++ b/src/ifcopenshell-python/ifcopenshell/validate.py
@@ -55,11 +55,7 @@ from collections import namedtuple
 from typing import Union, Any, Optional, TYPE_CHECKING
 from collections.abc import Iterator
 from logging import Logger, Handler
-
-if sys.version_info >= (3, 10):
-    from types import EllipsisType
-else:
-    EllipsisType = type(...)
+from types import EllipsisType
 
 import ifcopenshell
 import ifcopenshell.ifcopenshell_wrapper
diff --git a/src/ifcopenshell-python/pyproject.toml b/src/ifcopenshell-python/pyproject.toml
index 08f8c433fc..790891e350 100644
--- a/src/ifcopenshell-python/pyproject.toml
+++ b/src/ifcopenshell-python/pyproject.toml
@@ -10,7 +10,7 @@ authors = [
 ]
 description = "Python bindings, utility functions, and high-level API for IfcOpenShell"
 readme = "README.md"
-requires-python = ">=3.9,<3.15"
+requires-python = ">=3.10,<3.15"
 classifiers = [
     "Programming Language :: Python :: 3",
     "License :: OSI Approved :: GNU Lesser General Public License v3 or later (LGPLv3+)",
diff --git a/win/build-all-win.py b/win/build-all-win.py
index 5c2c6ababa..087f869ac4 100644
--- a/win/build-all-win.py
+++ b/win/build-all-win.py
@@ -11,7 +11,7 @@ from zipfile import ZipFile
 
 assert Path.cwd() == Path(__file__).parent, "Run this script from the 'win' directory."
 
-PYTHON_VERSIONS = ["3.9.13", "3.10.3", "3.11.8", "3.12.1", "3.13.0", "3.14.0"]
+PYTHON_VERSIONS = ["3.10.3", "3.11.8", "3.12.1", "3.13.0", "3.14.0"]
 REPO_PATH = Path(__file__).parent.parent
 REPO_WIN = REPO_PATH / "win"
 VERSION = (REPO_PATH / "VERSION").read_text().strip()