BREAKING: Require Python 3.8 to run repo2docker

.github/workflows/release.yml

@@ -34,7 +34,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: "3.9"
+          python-version: "3.13"
 
       - name: install build requirements
         run: |

.github/workflows/test.yml

@@ -51,7 +51,7 @@ jobs:
       fail-fast: false
       matrix:
         ubuntu_version: ["24.04"]
-        python_version: ["3.9"]
+        python_version: ["3.13"]
         repo_type:
           - base
           - conda
@@ -64,17 +64,13 @@ jobs:
           - unit
           - venv
           - contentproviders
-        include:
-          # The actions/setup-python action with Python version 3.6 isn't
-          # possible to use with the ubuntu-22.04 runner, so we use ubuntu-20.04
-          # for this test where Python 3.6 remain available.
-          - ubuntu_version: "20.04"
-            python_version: "3.6"
-            repo_type: venv
           # Playwright test
-          - ubuntu_version: "24.04"
-            python_version: "3.13"
-            repo_type: ui
+          - ui
+        include:
+          # The earliest actions/setup-python versions depend on the runner.
+          - ubuntu_version: "22.04"
+            python_version: "3.8"
+            repo_type: venv
 
     steps:
       - uses: actions/checkout@v4

.pre-commit-config.yaml

@@ -15,10 +15,10 @@ repos:
     hooks:
       - id: pyupgrade
         args:
-          - --py36-plus
+          - --py38-plus
         # check-tmp is a Python based test script run in created environments
-        # that can be at least Python 3.5 even though we require Python 3.6 for
-        # repo2docker itself.
+        # that can be Python 3.5, older than the Python version required to run
+        # repo2docker.
         exclude: check-tmp
 
   # Autoformat: Python code
@@ -27,12 +27,12 @@ repos:
     hooks:
       - id: black
         args:
-          - --target-version=py36
-          - --target-version=py37
           - --target-version=py38
           - --target-version=py39
           - --target-version=py310
           - --target-version=py311
+          - --target-version=py312
+          - --target-version=py313
 
   # Autoformat: Python code
   - repo: https://github.com/pycqa/isort

README.md

@@ -36,7 +36,7 @@ For more information, please visit
 
 1. Docker to build & run the repositories. The [community edition](https://store.docker.com/search?type=edition&offering=community)
    is recommended.
-2. Python 3.6+.
+2. Python 3.8+.
 
 Supported on Linux and macOS. [See documentation note about Windows support.](http://repo2docker.readthedocs.io/en/latest/install.html#note-about-windows-support)
 

setup.py

@@ -62,7 +62,7 @@ setup(
         "toml",
         "traitlets",
     ],
-    python_requires=">=3.6",
+    python_requires=">=3.8",
     author="Project Jupyter Contributors",
     author_email="jupyter@googlegroups.com",
     url="https://repo2docker.readthedocs.io/en/latest/",