diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 96c0358..6564773 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python: ['3.7', '3.8', '3.9', '3.10']
+        python: ['3.9', '3.10', '3.11', '3.12', '3.13']
     steps:
       - name: Checkout source code
         uses: actions/checkout@v3
@@ -37,7 +37,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.10'
+          python-version: '3.13'
       - name: Install dependencies
         run: python -m pip install build
       - name: Build a binary wheel and a source tarball
diff --git a/setup.py b/setup.py
index 0773ab3..22731ad 100644
--- a/setup.py
+++ b/setup.py
@@ -25,13 +25,14 @@ def read(fname):
             'click-man = click_man.__main__:cli',
         ]
     },
+    python_requires='>=3.9',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: MIT License',
         'Operating System :: OS Independent',
-        'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3 :: Only',
         'Topic :: Documentation',
     ],
 )
diff --git a/tox.ini b/tox.ini
index a125739..3cc7717 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,12 +4,10 @@
 # and then run "tox" from this directory.
 
 [tox]
-minversion = 3.1
-envlist = py37,py38,py39,py310
-ignore_basepython_conflict = true
+minversion = 4.4
+envlist = py39,py310,py311,py312,py313
 
 [testenv]
-basepython = python3
 deps =
   pytest
   pytest-cov