From 1d9a8f542b2b4fc588f0961c59ea674e4c6ca5ca Mon Sep 17 00:00:00 2001
From: Micah Gale <mgale@fastmail.com>
Date: Thu, 26 Feb 2026 18:18:04 -0600
Subject: [PATCH] Add Python 3.14 to testing matrix and drop Python 3.11
 (#3642)

Co-authored-by: GuySten <guyste@post.bgu.ac.il>
Co-authored-by: Paul Romano <paul.k.romano@gmail.com>
---
 .github/workflows/ci.yml | 19 +++++++++++--------
 pyproject.toml           |  4 ++--
 tools/ci/gha-install.sh  |  2 +-
 3 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d0382d8d6..3e232dce0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -43,7 +43,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        python-version: ["3.11"]
+        python-version: ["3.12"]
         mpi: [n, y]
         omp: [n, y]
         dagmc: [n]
@@ -51,26 +51,29 @@ jobs:
         event: [n]
 
         include:
-          - python-version: "3.12"
-            omp: n
-            mpi: n
           - python-version: "3.13"
             omp: n
             mpi: n
+          - python-version: "3.14"
+            omp: n
+            mpi: n
+          - python-version: "3.14t"
+            omp: n
+            mpi: n
           - dagmc: y
-            python-version: "3.11"
+            python-version: "3.12"
             mpi: y
             omp: y
           - libmesh: y
-            python-version: "3.11"
+            python-version: "3.12"
             mpi: y
             omp: y
           - libmesh: y
-            python-version: "3.11"
+            python-version: "3.12"
             mpi: n
             omp: y
           - event: y
-            python-version: "3.11"
+            python-version: "3.12"
             omp: y
             mpi: n
     name: "Python ${{ matrix.python-version }} (omp=${{ matrix.omp }},
diff --git a/pyproject.toml b/pyproject.toml
index 21342155a..b2b5ff5e4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,7 +9,7 @@ authors = [
 ]
 description = "OpenMC"
 dynamic = ["version"]
-requires-python = ">=3.11"
+requires-python = ">=3.12"
 license = {file = "LICENSE"}
 classifiers = [
     "Development Status :: 4 - Beta",
@@ -21,9 +21,9 @@ classifiers = [
     "Topic :: Scientific/Engineering",
     "Programming Language :: C++",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
 ]
 dependencies = [
     "numpy",
diff --git a/tools/ci/gha-install.sh b/tools/ci/gha-install.sh
index f405baedd..4cf62afbb 100755
--- a/tools/ci/gha-install.sh
+++ b/tools/ci/gha-install.sh
@@ -35,7 +35,7 @@ if [[ $MPI == 'y' ]]; then
     export HDF5_MPI=ON
     export HDF5_DIR=/usr/lib/x86_64-linux-gnu/hdf5/mpich
     # Install h5py without build isolation to pick up already installed mpi4py
-    pip install Cython pkgconfig
+    pip install setuptools Cython pkgconfig
     pip install --no-build-isolation --no-binary=h5py h5py
 fi