diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 00000000..7a62ba31
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,16 @@
+.git/
+.github/
+validation/
+vendor/
+docs/
+tools/
+**/.DS_Store
+**/.idea
+**/composer.lock
+tests/output
+.phpunit.result.cache
+**/*.ast
+**/.*.swp
+**/.*.swo
+**/Dockerfile
+.dockerignore
diff --git a/.gitattributes b/.gitattributes
index b9ab85aa..b3326bf5 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -3,6 +3,7 @@
 /tests/cases/**/*.php text eol=lf
 
 /.vscode export-ignore
+/ci export-ignore
 /docs export-ignore
 /experiments export-ignore
 /php-langspec export-ignore
@@ -17,3 +18,4 @@
 /Contributing.md export-ignore
 /README.md export-ignore
 /phpunit.xml export-ignore
+/.dockerignore export-ignore
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 00000000..edc2dd59
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,43 @@
+# Runs tolerant-php-parser's tests
+name: CI
+
+# Controls when the action will run.
+on:
+  # Triggers the workflow on push or pull request events but only for the main branch
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # See https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#using-environment-variables-in-a-matrix
+    strategy:
+      fail-fast: false
+      matrix:
+       include:
+         # NOTE: If this is not quoted, the yaml parser will convert numbers such as 8.0 to the number 8,
+         # and the docker image `php:8` is the latest minor version of php 8.x (8.1).
+         - PHP_VERSION: '7.2'
+         - PHP_VERSION: '7.3'
+         - PHP_VERSION: '7.4'
+         - PHP_VERSION: '8.0'
+         - PHP_VERSION: '8.1'
+         - PHP_VERSION: '8.2.0beta2'
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v2
+
+      # Runs a single command using the runners shell
+      - name: Build and test in docker
+        run: bash ci/run_tests_dockerized.sh ${{ matrix.PHP_VERSION }}
diff --git a/.gitignore b/.gitignore
index b38b0286..f40bc934 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@ tests/output
 *.ast
 .*.swp
 .*.swo
+.phpunit.result.cache
diff --git a/ci/Dockerfile b/ci/Dockerfile
new file mode 100644
index 00000000..2949d56e
--- /dev/null
+++ b/ci/Dockerfile
@@ -0,0 +1,12 @@
+ARG PHP_VERSION
+FROM php:$PHP_VERSION
+RUN curl https://getcomposer.org/download/latest-2.x/composer.phar -o /usr/bin/composer.phar && chmod a+x /usr/bin/composer.phar
+WORKDIR /tolerant-php-parser
+RUN apt-get update && apt-get install -y unzip && apt-get clean
+ARG COMPOSER_OPTIONS
+ENV COMPOSER_OPTIONS=$COMPOSER_OPTIONS
+
+ADD composer.json ./
+RUN composer.phar install $COMPOSER_OPTIONS && composer.phar clear-cache
+
+ADD . .
diff --git a/ci/run_tests.sh b/ci/run_tests.sh
new file mode 100755
index 00000000..fdda534c
--- /dev/null
+++ b/ci/run_tests.sh
@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+# This runs the tests that have been set up in GitHub Workflows so far
+
+# -x Exit immediately if any command fails
+# -e Echo all commands being executed.
+set -xe
+php -d short_open_tag=0 ./vendor/bin/phpunit --testsuite invariants
+php -d short_open_tag=0 ./vendor/bin/phpunit --testsuite grammar
+php -d short_open_tag=0 ./vendor/bin/phpunit --testsuite api
diff --git a/ci/run_tests_dockerized.sh b/ci/run_tests_dockerized.sh
new file mode 100755
index 00000000..e1ceee0f
--- /dev/null
+++ b/ci/run_tests_dockerized.sh
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+if [ $# != 1 ]; then
+    echo "Usage: $0 PHP_VERSION" 1>&2
+    echo "e.g. $0 8.0" 1>&2
+    echo "The PHP_VERSION is the version of the php docker image to use" 1>&2
+    echo "This runs the tests that have been set up in GitHub Workflows so far" 1>&2
+    exit 1
+fi
+# -x Exit immediately if any command fails
+# -e Echo all commands being executed.
+# -u fail for undefined variables
+set -xeu
+PHP_VERSION=$1
+COMPOSER_OPTIONS=""
+# lexicographic comparison
+if [ "$PHP_VERSION" > "8.1" ]; then
+	COMPOSER_OPTIONS="--ignore-platform-reqs"
+fi
+
+DOCKER_IMAGE="tolerant-php-parser-test-runner:$PHP_VERSION"
+docker build --build-arg="PHP_VERSION=$PHP_VERSION" --build-arg="COMPOSER_OPTIONS=$COMPOSER_OPTIONS" --tag="$DOCKER_IMAGE" -f ci/Dockerfile .
+docker run --rm $DOCKER_IMAGE ci/run_tests.sh