diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..674b070
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,45 @@
+name: test
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+
+jobs:
+  # Full test suite. asynctest does not work on Python 3.11+
+  # (asyncio.coroutine was removed), so tests run on 3.8-3.10 only.
+  test:
+    runs-on: ubuntu-24.04
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.8", "3.9", "3.10"]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install package and test dependencies
+        run: |
+          pip install .
+          pip install asynctest pytest pytest-mock pyyaml jsonschema
+      - name: Run tests
+        run: pytest -vv
+
+  # Import smoke test on newer Pythons where the test suite cannot run.
+  import-check:
+    runs-on: ubuntu-24.04
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.11", "3.12", "3.13"]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install package
+        run: pip install .
+      - name: Import check
+        working-directory: ${{ runner.temp }}
+        run: python -c "from obniz import Obniz; print('import OK')"
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index ef995f6..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,12 +0,0 @@
-dist: xenial
-language: python
-python:
-- "3.6"
-- "3.7"
-
-install:
-  - pip install pipenv
-  - pipenv install --deploy --dev
-
-script:
-  - pipenv run pytest
diff --git a/README-ja.md b/README-ja.md
index 934c4aa..d1b658b 100644
--- a/README-ja.md
+++ b/README-ja.md
@@ -5,7 +5,7 @@
 [obniz](https://obniz.io/)をpythonから操作するためのsdkです。
 [obnizBoard](https://obniz.io/ja/doc/obniz_board_hobby_90/hw_overview)と[obnizOS](https://obniz.io/ja/doc/obnizos/os_overview)に対応しています
 
-**Python 3.6以上**で動作します。
+**Python 3.8以上**で動作します。
 
 <img src="https://object-storage.tyo1.conoha.io/v1/nc_35a49f4e51c74e35ad3493c52d37f63e/images/obniz-python-readme.gif" width="100%" />
 
diff --git a/README.md b/README.md
index acb453a..496001c 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ Control obniz from python.
 
 This sdk works with [obniz api](https://obniz.io/doc/about_obniz_api).
 
-Compatible with **Python 3.6+**.
+Compatible with **Python 3.8+**.
 
 <img src="https://object-storage.tyo1.conoha.io/v1/nc_35a49f4e51c74e35ad3493c52d37f63e/images/obniz-python-readme.gif" width="100%" />
 
diff --git a/tox.ini b/tox.ini
index 5647803..9a890bb 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,8 +3,11 @@
 # test suite on all supported python versions. To use it, "pip install tox"
 # and then run "tox" from this directory.
 
+# Note: the test suite depends on asynctest, which does not work on
+# Python 3.11+ (asyncio.coroutine was removed). Runtime supports 3.8+,
+# but tests can only run on 3.8-3.10 until asynctest is replaced.
 [tox]
-envlist = py36, py37
+envlist = py38, py39, py310
 
 [testenv]
 deps =