chore: drop Python 3.9 support, bump pytest to >=9.0.3

Python 3.9 reached EOL in October 2025. Bumping the minimum to 3.10
allows updating pytest past 8.x, which resolves the Dependabot alert
for the pytest tmpdir vulnerability (fixed in 9.0.3).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: slhck

.github/workflows/python-package.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.14"]
+        python-version: ["3.10", "3.14"]
 
     steps:
     - uses: actions/checkout@v4

CLAUDE.md

@@ -118,6 +118,6 @@ Tests use pytest and include actual media files in the `tests/` directory. The t
 
 ### Requirements
 
-- Python 3.9+
+- Python 3.10+
 - FFmpeg binary must be available in PATH
 - The tool checks for FFmpeg loudnorm filter availability at runtime

README.md

@@ -26,7 +26,7 @@ This program normalizes media files to a certain loudness level using the EBU R1
 
 ## 🚀 Quick Start
 
-1. Install a recent version of [ffmpeg](https://ffmpeg.org/download.html)
+1. Install a recent version of [ffmpeg](https://ffmpeg.org/download.html) and Python 3.10 or higher
 2. Run `pip3 install ffmpeg-normalize` and `ffmpeg-normalize /path/to/your/file.mp4`, alternatively install [`uv`](https://docs.astral.sh/uv/getting-started/installation/) and run `uvx ffmpeg-normalize /path/to/your/file.mp4`
 3. Done! 🎧 (the normalized file will be called `normalized/file.mkv`)
 

docs/about/contributing.md

@@ -6,7 +6,7 @@ Thank you for your interest in contributing to ffmpeg-normalize! This guide will
 
 ### Prerequisites
 
-- Python 3.9 or higher
+- Python 3.10 or higher
 - FFmpeg installed and available in PATH
 - [uv](https://docs.astral.sh/uv/getting-started/installation/) (recommended) or pip
 

docs/getting-started/requirements.md

@@ -1,6 +1,6 @@
 # Requirements
 
-You need Python 3.9 or higher, and ffmpeg.
+You need Python 3.10 or higher, and ffmpeg.
 
 ## ffmpeg
 

docs/index.md

@@ -13,7 +13,7 @@ Batch processing of several input files is possible, including video files.
 ## Quick Start
 
 
-1. Install a recent version of [ffmpeg](https://ffmpeg.org/download.html)
+1. Install a recent version of [ffmpeg](https://ffmpeg.org/download.html) and Python 3.10 or higher
 2. Run `pip3 install ffmpeg-normalize` and `ffmpeg-normalize /path/to/your/file.mp4`, alternatively install [`uv`](https://docs.astral.sh/uv/getting-started/installation/) and run `uvx ffmpeg-normalize /path/to/your/file.mp4`
 3. Done! 🎧 (the normalized file will be called `normalized/file.mkv`)
 

pyproject.toml

@@ -21,14 +21,13 @@ classifiers = [
     "Topic :: Multimedia :: Sound/Audio :: Conversion",
     "Natural Language :: English",
     "Programming Language :: Python :: 3",
-    "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",
 ]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 dependencies = [
     "tqdm>=4.64.1",
     "colorama>=0.4.6; platform_system=='Windows'",
@@ -50,7 +49,7 @@ package-data = {"ffmpeg_normalize" = ["data/**/*.json"]}
 
 [dependency-groups]
 dev = [
-    "pytest>=8.1.1,<9",
+    "pytest>=9.0.3",
     "ruff>=0.12.11",
     "types-tqdm",
     "shtab>=1.7.0",