From b6af357be5e2c173b66c9a7a52754c62f7e27226 Mon Sep 17 00:00:00 2001
From: Morten Engen <morten.engen@multiconsult.no>
Date: Mon, 16 Mar 2026 09:25:53 +0100
Subject: [PATCH] Drop support for 3.9

---
 .github/workflows/build.yaml | 2 +-
 README.md                    | 1 +
 docs/installation/index.md   | 2 +-
 pyproject.toml               | 6 +++++-
 tox.ini                      | 2 +-
 5 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 482242ed..84141917 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python ${{ matrix.python-version }}
diff --git a/README.md b/README.md
index f71af51f..6590374c 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,7 @@
 *A Python library for structural engineering calculations.*
 
 [![PyPI version](https://badge.fury.io/py/structuralcodes.svg)](https://badge.fury.io/py/structuralcodes)
+[![PyPI - Python Version](https://img.shields.io/pypi/pyversions/structuralcodes)](https://pypi.org/project/structuralcodes/)
 [![Code style: Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/charliermarsh/ruff/main/assets/badge/format.json)](https://github.com/charliermarsh/ruff)
 [![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/charliermarsh/ruff/main/assets/badge/v2.json)](https://github.com/charliermarsh/ruff)
 [![Docs](https://img.shields.io/badge/%F0%9F%93%9A%20docs-fib--international.github.io%2Fstructuralcodes%2F-orange)](https://fib-international.github.io/structuralcodes/)
diff --git a/docs/installation/index.md b/docs/installation/index.md
index 59c07ab6..608c7a74 100644
--- a/docs/installation/index.md
+++ b/docs/installation/index.md
@@ -1,7 +1,7 @@
 (installation)=
 # Installation
 
-`structuralcodes` is compatible with Python 3.9, 3.10, 3.11, 3.12, and 3.13, and is installed by typing:
+`structuralcodes` is compatible with [![PyPI - Python Version](https://img.shields.io/pypi/pyversions/structuralcodes)](https://pypi.org/project/structuralcodes/) and is installed by typing:
 
 :::::{tab-set}
 ::::{tab-item} Python
diff --git a/pyproject.toml b/pyproject.toml
index 869abca2..8f307fe6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,9 +10,13 @@ authors = [
     {name = "fib - International Federation for Structural Concrete", email = "info@fib-international.org"}
 ]
 readme = "README.md"
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 classifiers = [
     "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Operating System :: OS Independent"
 ]
 dependencies = [
diff --git a/tox.ini b/tox.ini
index 3f2284ff..c34a117f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 isolated_build = True
-envlist = py{39, 310, 311, 312, 313}
+envlist = py{310, 311, 312, 313}
 
 [testenv]
 allowlist_externals = make