From a582d26dc0df169e6bb5a39187bc0a11e2cbd3ac Mon Sep 17 00:00:00 2001
From: Aaron Zielstorff <aaron.zielstorff@iese.fraunhofer.de>
Date: Sun, 8 Nov 2026 12:55:59 +0100
Subject: [PATCH 1/2] Pin CI runner for Python 3.9

---
 .github/workflows/ci.yml              | 9 ++++++---
 .github/workflows/publish-to-pypi.yml | 2 +-
 dev/pyproject.toml                    | 9 ++++++---
 3 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 815dd76..0cee564 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,7 +9,10 @@ on:
 
 jobs:
   Only-test:
-    runs-on: ubuntu-latest
+    # NOTE (aaronzi, 2026-11-05):
+    # ubuntu-latest (26.04) does not provide Python 3.9 anymore, so we pin
+    # the runner to keep testing all the Python versions we support.
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
         python-version: ['3.9', '3.10', '3.11', '3.12']
@@ -18,7 +21,7 @@ jobs:
       - uses: actions/checkout@master
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
 
@@ -54,7 +57,7 @@ jobs:
       - uses: actions/checkout@master
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
 
diff --git a/.github/workflows/publish-to-pypi.yml b/.github/workflows/publish-to-pypi.yml
index b2dbbb7..55f89cf 100644
--- a/.github/workflows/publish-to-pypi.yml
+++ b/.github/workflows/publish-to-pypi.yml
@@ -18,7 +18,7 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Set up Python
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v6
       with:
         python-version: '3.x'
 
diff --git a/dev/pyproject.toml b/dev/pyproject.toml
index a6f0bfc..185f0fe 100644
--- a/dev/pyproject.toml
+++ b/dev/pyproject.toml
@@ -9,16 +9,19 @@ description = "Develop aas-core3.2-python."
 requires-python = ">=3.8"
 
 dependencies = [
-    "black==26.10.1",
+    # NOTE (aaronzi, 2026-11-05):
+    # black, mypy and aas-core-codegen require Python 3.10 or newer, so we skip
+    # them on 3.9, where we only run the tests.
+    "black==26.10.1; python_version>='3.10'",
     "coverage>=6.5.0,<7",
-    "mypy==2.4.0",
+    "mypy==2.4.0; python_version>='3.10'",
     "pyinstaller>=5,<6",
     "ruff==0.17.2",
     "tomli; python_version<'3.11'",
     "twine",
     "requests==2.32.4",
     "types-requests==2.32.4.20250913",
-    "aas-core-codegen==0.0.27rc5"
+    "aas-core-codegen==0.0.27rc5; python_version>='3.10'"
 ]
 
 [tool.setuptools]

From 9aba29d8de679c0552e20bad9147ce0b85974096 Mon Sep 17 00:00:00 2001
From: Aaron Zielstorff <aaron.zielstorff@iese.fraunhofer.de>
Date: Sun, 8 Nov 2026 12:59:44 +0100
Subject: [PATCH 2/2] Install icontract explicitly for the dev scripts

---
 dev/pyproject.toml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/dev/pyproject.toml b/dev/pyproject.toml
index 185f0fe..94e5840 100644
--- a/dev/pyproject.toml
+++ b/dev/pyproject.toml
@@ -14,6 +14,10 @@ dependencies = [
     # them on 3.9, where we only run the tests.
     "black==26.10.1; python_version>='3.10'",
     "coverage>=6.5.0,<7",
+    # NOTE (aaronzi, 2026-11-05):
+    # The dev scripts import icontract directly. It used to come in through
+    # aas-core-codegen, which we skip on Python 3.9.
+    "icontract",
     "mypy==2.4.0; python_version>='3.10'",
     "pyinstaller>=5,<6",
     "ruff==0.17.2",