From 179efc1ac93789ecf47a1fb6dc8bfb6023981fee Mon Sep 17 00:00:00 2001
From: wpbonelli <wpbonelli@gmail.com>
Date: Tue, 8 Sep 2026 08:56:25 -0400
Subject: [PATCH] build: bump minimum Python to 3.12 per SPEC 0

SPEC 0 recommends dropping Python 3.11 as of 2025 Q4, leaving 3.12 as
the minimum supported version. Update requires-python, the version
classifiers, the CI test matrix, and the README.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015mPaiFFn5JMme3d9CmxE67
---
 .github/workflows/ci.yml | 6 +++---
 README.md                | 2 +-
 pyproject.toml           | 3 +--
 3 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d9f04dc..693fe6c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -81,7 +81,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ ubuntu-latest, macos-latest, windows-latest ]
-        python-version: [ "3.11", "3.12", "3.13", "3.14" ]
+        python-version: [ "3.12", "3.13", "3.14" ]
     defaults:
       run:
         shell: bash
@@ -134,7 +134,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ ubuntu-latest, windows-latest ]
-        python-version: [ "3.11", "3.12", "3.13", "3.14" ]
+        python-version: [ "3.12", "3.13", "3.14" ]
     defaults:
       run:
         shell: bash
@@ -189,7 +189,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ ubuntu-latest, macos-latest, windows-latest ]
-        python-version: [ "3.11", "3.12", "3.13", "3.14" ]
+        python-version: [ "3.12", "3.13", "3.14" ]
     defaults:
       run:
         shell: bash
diff --git a/README.md b/README.md
index 8e05d20..8d6ce26 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ and additional functionality specific to the MODFLOW API. Currently it is a join
 
 ## Installation
 
-`modflowapi` requires Python 3.11+, with:
+`modflowapi` requires Python 3.12+, with:
 
 ```shell
 numpy
diff --git a/pyproject.toml b/pyproject.toml
index 054124b..d9b2dfa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,13 +25,12 @@ classifiers = [
     "Intended Audience :: Science/Research",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: 3.14",
     "Topic :: Scientific/Engineering :: Hydrology",
 ]
-requires-python = ">=3.11"
+requires-python = ">=3.12"
 dependencies = [
     "numpy>=1.23",
     "pandas>=2.2.2",