diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index d08f3af..0000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,182 +0,0 @@
-# Python CircleCI 2.0 configuration file
-#
-# Check https://circleci.com/docs/2.0/language-python/ for more details
-#
-# TODO: port to github actions
-version: 2
-
-jobs:
-  "python-3.7":
-    docker:
-      - image: cimg/python:3.7
-
-    working_directory: ~/repo
-
-    steps:
-      - checkout
-      - restore_cache:
-          keys:
-            - v2-dependencies-py3.7-{{ checksum "test-requirements.txt" }}
-            - v2-dependencies-py3.7-
-      - run:
-          name: install dependencies
-          command: |
-            python3 -m venv venv
-            . venv/bin/activate
-            pip install -r test-requirements.txt
-      - save_cache:
-          paths:
-            - ./venv
-          key: v2-dependencies-py3.7-{{ checksum "test-requirements.txt" }}
-      - run:
-          name: run tests
-          command: |
-            . venv/bin/activate
-            make test
-      - run:
-          name: run lint
-          command: |
-            . venv/bin/activate
-            make lint
-
-  "python-3.7_trio-0.11":
-    docker:
-      - image: cimg/python:3.7
-
-    working_directory: ~/repo
-
-    steps:
-      - checkout
-      - restore_cache:
-          keys:
-            - v2-dependencies-py3.7-{{ checksum "test-requirements_trio-0.11.txt" }}
-            - v2-dependencies-py3.7-
-      - run:
-          name: install dependencies
-          command: |
-            python3 -m venv venv
-            . venv/bin/activate
-            pip install -r test-requirements.txt
-      - save_cache:
-          paths:
-            - ./venv
-          key: v2-dependencies-py3.7-{{ checksum "test-requirements_trio-0.11.txt" }}
-      - run:
-          name: run tests
-          command: |
-            . venv/bin/activate
-            make test
-      - run:
-          name: run lint
-          command: |
-            . venv/bin/activate
-            make lint
-
-  "python-3.8":
-    docker:
-      - image: cimg/python:3.8
-
-    working_directory: ~/repo
-
-    steps:
-      - checkout
-      - restore_cache:
-          keys:
-            - v2-dependencies-py3.8-{{ checksum "test-requirements.txt" }}
-            - v2-dependencies-py3.8-
-      - run:
-          name: install dependencies
-          command: |
-            python3 -m venv venv
-            . venv/bin/activate
-            pip install -r test-requirements.txt
-      - save_cache:
-          paths:
-            - ./venv
-          key: v2-dependencies-py3.8-{{ checksum "test-requirements.txt" }}
-      - run:
-          name: run tests
-          command: |
-            . venv/bin/activate
-            make test
-      - run:
-          name: run lint
-          command: |
-            . venv/bin/activate
-            make lint
-
-  "python-3.9":
-    docker:
-      - image: cimg/python:3.9
-
-    working_directory: ~/repo
-
-    steps:
-      - checkout
-      - restore_cache:
-          keys:
-            - v2-dependencies-py3.9-{{ checksum "test-requirements.txt" }}
-            - v2-dependencies-py3.9-
-      - run:
-          name: install dependencies
-          command: |
-            python3 -m venv venv
-            . venv/bin/activate
-            pip install -r test-requirements.txt
-      - save_cache:
-          paths:
-            - ./venv
-          key: v2-dependencies-py3.9-{{ checksum "test-requirements.txt" }}
-      - run:
-          name: run tests
-          command: |
-            . venv/bin/activate
-            make test
-      - run:
-          name: run lint
-          command: |
-            . venv/bin/activate
-            make lint
-
-  "python-3.10":
-    docker:
-      - image: cimg/python:3.10
-
-    working_directory: ~/repo
-
-    steps:
-      - checkout
-      - restore_cache:
-          keys:
-            - v2-dependencies-py3.10-{{ checksum "test-requirements.txt" }}
-            - v2-dependencies-py3.10-
-      - run:
-          name: install dependencies
-          command: |
-            python3 -m venv venv
-            . venv/bin/activate
-            pip install -r test-requirements.txt
-      - save_cache:
-          paths:
-            - ./venv
-          key: v2-dependencies-py3.10-{{ checksum "test-requirements.txt" }}
-      - run:
-          name: run tests
-          command: |
-            . venv/bin/activate
-            make test
-      - run:
-          name: run lint
-          command: |
-            . venv/bin/activate
-            make lint
-
-workflows:
-  version: 2
-  build:
-    jobs:
-      - "python-3.7"
-      - "python-3.7_trio-0.11"
-      - "python-3.8"
-      - "python-3.9"
-      - "python-3.10"
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..4feedc0
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,25 @@
+name: CI
+
+on: [push]
+
+jobs:
+  build_and_test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.7', '3.8', '3.9', '3.10']
+        requirements: [test-requirements.txt]
+        include:
+          - python-version: '3.7'
+            requirements: test-requirements_trio-0.11.txt
+    steps:
+      - uses: actions/checkout@v3
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: pip
+          cache-dependency-path: ${{ matrix.requirements }}
+      # TODO: unpinned "latest" build
+      - run: pip install . -r ${{ matrix.requirements }}
+      - run: make test lint
diff --git a/README.md b/README.md
index 93ba993..92310eb 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-[![Build status](https://img.shields.io/circleci/build/github/belm0/perf-timer)](https://circleci.com/gh/belm0/perf-timer)
+[![Build status](https://img.shields.io/github/workflow/status/belm0/perf-timer/CI)](https://github.com/belm0/perf-timer/actions/workflows/ci.yml)
 [![Package version](https://img.shields.io/pypi/v/perf-timer.svg)](https://pypi.org/project/perf-timer)
 [![Supported Python versions](https://img.shields.io/pypi/pyversions/perf-timer.svg)](https://pypi.org/project/perf-timer)