diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..58bbeb8
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,33 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        php: [7.0, 7.1, 7.2, 7.3, 7.4, 8.0]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: none
+
+      - name: Validate composer.json and composer.lock
+        run: composer validate
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress --no-interaction --no-suggest
+
+      - name: Check code style
+        run: vendor/bin/phpcs
+
+      - name: Run test suite
+        run: vendor/bin/phpunit
\ No newline at end of file
diff --git a/composer.json b/composer.json
index c28d620..ab44577 100644
--- a/composer.json
+++ b/composer.json
@@ -16,8 +16,8 @@
     "psr/http-client": "^1.0"
   },
   "require-dev": {
-    "nyholm/psr7": "^1.3",
-    "phpunit/phpunit": "^6.5",
+    "guzzlehttp/psr7": "^1.7",
+    "phpunit/phpunit": ">=6.5",
     "squizlabs/php_codesniffer": "^3.5",
     "webclient/fake-http-client": "^1.0"
   },
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 66b98f0..6f90c5c 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit bootstrap="vendor/autoload.php" colors="true">
+<phpunit bootstrap="vendor/autoload.php" colors="true" cacheResult="false">
     <testsuites>
         <testsuite name="all">
             <directory>tests</directory>
diff --git a/stuff/Handler.php b/stuff/Handler.php
index 777a0af..3b91344 100644
--- a/stuff/Handler.php
+++ b/stuff/Handler.php
@@ -4,7 +4,7 @@
 
 namespace Stuff\Webclient\Extension\ProtocolVersion;
 
-use Nyholm\Psr7\Response;
+use GuzzleHttp\Psr7\Response;
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
 use Psr\Http\Server\RequestHandlerInterface;
diff --git a/tests/ClientTest.php b/tests/ClientTest.php
index f17503b..fd5054e 100644
--- a/tests/ClientTest.php
+++ b/tests/ClientTest.php
@@ -5,7 +5,7 @@
 namespace Tests\Webclient\Extension\ProtocolVersion;
 
 use Stuff\Webclient\Extension\ProtocolVersion\Handler;
-use Nyholm\Psr7\Request;
+use GuzzleHttp\Psr7\Request;
 use PHPUnit\Framework\TestCase;
 use Psr\Http\Client\ClientExceptionInterface;
 use Webclient\Extension\ProtocolVersion\Client;