diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index f6b2f1f..0000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,48 +0,0 @@
-version: 2.1
-
-workflows:
-  test:
-    jobs:
-      - test_3-7
-      - test_3-8
-      - test_3-9
-      - test_3-10
-      - test_3-11
-
-template: &template
-  working_directory: ~/repo
-  steps:
-    - checkout
-    - run:
-        name: install dependencies
-        command: |
-          pip install -r base_requirements.txt
-          pip install -r dev_requirements.txt
-          pip install -e .
-    - run:
-        name: run static analysis
-        command: |
-          flake8
-          isort -c .
-
-jobs:
-  test_3-7:
-    docker:
-      - image: cimg/python:3.7
-    <<: *template
-  test_3-8:
-    docker:
-      - image: cimg/python:3.8
-    <<: *template
-  test_3-9:
-    docker:
-      - image: cimg/python:3.9
-    <<: *template
-  test_3-10:
-    docker:
-      - image: cimg/python:3.10
-    <<: *template
-  test_3-11:
-    docker:
-      - image: cimg/python:3.11
-    <<: *template
diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
new file mode 100644
index 0000000..2d4ebfb
--- /dev/null
+++ b/.github/workflows/python.yml
@@ -0,0 +1,23 @@
+name: CI
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+jobs:
+  test:
+    name: Run tests
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python: ["3.9", "3.10", "3.11", "3.12"]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python }}
+      - name: Install tox and any other packages
+        run: pip install tox
+      - name: Run tox
+        run: tox run -e py
diff --git a/MANIFEST.in b/MANIFEST.in
index d2ab066..9814b23 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -5,4 +5,4 @@ include dev_requirements.txt
 include CHANGELOG.md
 include LICENSE
 include README.md
-prune .circleci
+exclude tox.ini
diff --git a/setup.cfg b/setup.cfg
index 8714433..61dd3e2 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,13 +1,11 @@
 [flake8]
 max-line-length = 120
-max-complexity = 10
 
 [isort]
 force_single_line = true
 line_length = 120
 lines_between_types = 1
 skip_glob = *.template
-known_third_party = yaml
 
 [zest.releaser]
 create-wheel = yes
diff --git a/setup.py b/setup.py
index 3143d69..fb93acf 100644
--- a/setup.py
+++ b/setup.py
@@ -49,10 +49,9 @@ def get_long_description():
         'License :: OSI Approved :: BSD License',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.7',
-        'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
+        'Programming Language :: Python :: 3.12',
     ],
 )
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..17032ea
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,15 @@
+[tox]
+requires =
+    tox>=4
+env_list = py{39,310,311,312}
+
+[testenv]
+description = run linters
+skip_install = true
+deps =
+    flake8
+    flake8-commas
+    isort
+commands =
+    flake8
+    isort --check --diff .