diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5b72cf4..36dde00 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,7 +22,7 @@ jobs:
       fail-fast: false
       max-parallel: 5
       matrix:
-        python-version: [3.9, '3.10', '3.11', '3.12', '3.13', '3.14']
+        python-version: ['3.10', '3.11', '3.12', '3.13', '3.14', '3.15']
 
     steps:
       - name: Print github context
diff --git a/pyproject.toml b/pyproject.toml
index e86e3da..c24ca88 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ authors = [
 ]
 description = "Sphinx utility that make it easy to translate and to apply translation."
 readme = "README.rst"
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 license = "BSD-2-Clause"
 license-files = ["LICENSE"]
 dependencies = [
@@ -25,12 +25,12 @@ classifiers = [
     "Topic :: Text Processing :: General",
     "Topic :: Utilities",
     "Operating System :: OS Independent",
-    "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 :: 3.15",
     "Framework :: Sphinx",
 ]
 
@@ -70,5 +70,8 @@ local_scheme = "no-local-version"
 ignore_missing_imports = true
 strict_optional = false
 
+[tool.ruff]
+target-version = "py310"
+
 [tool.uv.sources]
 sphinx-intl = { workspace = true }
diff --git a/sphinx_intl/pycompat.py b/sphinx_intl/pycompat.py
index 23e9b1d..a205620 100644
--- a/sphinx_intl/pycompat.py
+++ b/sphinx_intl/pycompat.py
@@ -5,7 +5,8 @@
 import os
 import sys
 import warnings
-from typing import Any, Callable
+from collections.abc import Callable
+from typing import Any
 
 # ------------------------------------------------------------------------------
 # Python 2/3 compatibility
diff --git a/tests/path.py b/tests/path.py
index ca78554..21ad702 100755
--- a/tests/path.py
+++ b/tests/path.py
@@ -182,4 +182,4 @@ def joinpath(self, *args):
     __div__ = __truediv__ = joinpath
 
     def __repr__(self):
-        return '{}({})'.format(self.__class__.__name__, str.__repr__(self))
+        return f'{self.__class__.__name__}({str.__repr__(self)})'
diff --git a/tox.ini b/tox.ini
index abebb07..484754b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,17 +1,17 @@
 [tox]
 envlist =
-    py{39,310,311,312,313,314},
+    py{310,311,312,313,314,315},
     lint,
     mypy
 
 [gh-actions]
 python =
-    3.9: py39
     3.10: py310
     3.11: py311, lint, check
     3.12: py312
     3.13: py313
     3.14: py314
+    3.15: py315
 
 [testenv]
 deps=-e.[test]