diff --git a/.github/workflows/smoke.yml b/.github/workflows/smoke.yml
index da2c4dee0..fe5b82687 100644
--- a/.github/workflows/smoke.yml
+++ b/.github/workflows/smoke.yml
@@ -37,7 +37,7 @@ jobs:
           - {os: ubuntu-24.04, python: "3.14t", ffmpeg: "8.0", extras: true}
           - {os: ubuntu-24.04, python: "3.12", ffmpeg: "8.0", extras: true}
           - {os: ubuntu-24.04, python: "pypy3.10", ffmpeg: "8.0"}
-          - {os: macos-14, python: "3.9", ffmpeg: "8.0"}
+          - {os: macos-14, python: "3.10", ffmpeg: "8.0"}
 
     env:
       PYAV_PYTHON: python${{ matrix.config.python }}
@@ -111,7 +111,7 @@ jobs:
       fail-fast: false
       matrix:
         config:
-          - {os: windows-latest, python: "3.9", ffmpeg: "latest"}
+          - {os: windows-latest, python: "3.10", ffmpeg: "latest"}
 
     steps:
     - name: Checkout
diff --git a/pyproject.toml b/pyproject.toml
index 9710de837..33cde6b2c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools>=77.0", "cython>=3.1.0a1,<4"]
+requires = ["setuptools>=77.0", "cython>=3.1.0,<4"]
 
 [project]
 name = "av"
@@ -10,7 +10,7 @@ authors = [
     {name = "WyattBlue", email = "wyattblue@auto-editor.com"},
     {name = "Jeremy Lainé", email = "jeremy.laine@m4x.org"},
 ]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Intended Audience :: Developers",
@@ -20,11 +20,11 @@ classifiers = [
     "Operating System :: Unix",
     "Operating System :: Microsoft :: Windows",
     "Programming Language :: Cython",
-    "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",
     "Topic :: Software Development :: Libraries :: Python Modules",
     "Topic :: Multimedia :: Sound/Audio",
     "Topic :: Multimedia :: Sound/Audio :: Conversion",