diff --git a/.github/workflows/acceptance.yml b/.github/workflows/acceptance.yml
index 7bab97c..06c1766 100644
--- a/.github/workflows/acceptance.yml
+++ b/.github/workflows/acceptance.yml
@@ -63,6 +63,22 @@ jobs:
     - name: Test
       run: make test
 
+  test-8-1:
+    runs-on: ubuntu-latest
+    name: Test PHP 8.1
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Set up PHP 8.1
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: '8.1'
+    - name: Composer
+      run: make install
+    - name: Test
+      run: make test
+
+
   cs-check:
     runs-on: ubuntu-latest
     name: Code standard
diff --git a/tests/ClientTest.php b/tests/ClientTest.php
index c7bdc16..a5c8d84 100644
--- a/tests/ClientTest.php
+++ b/tests/ClientTest.php
@@ -13,7 +13,6 @@
 
 class ClientTest extends TestCase
 {
-
     public function setUp(): void
     {
         error_reporting(-1);
diff --git a/tests/ExceptionTest.php b/tests/ExceptionTest.php
index 84b939c..2083e70 100644
--- a/tests/ExceptionTest.php
+++ b/tests/ExceptionTest.php
@@ -13,7 +13,6 @@
 
 class ExceptionTest extends TestCase
 {
-
     public function setUp(): void
     {
         error_reporting(-1);
diff --git a/tests/MessageTest.php b/tests/MessageTest.php
index 2d06ab7..bade435 100644
--- a/tests/MessageTest.php
+++ b/tests/MessageTest.php
@@ -14,7 +14,6 @@
 
 class MessageTest extends TestCase
 {
-
     public function setUp(): void
     {
         error_reporting(-1);
diff --git a/tests/ServerTest.php b/tests/ServerTest.php
index 8294236..c2370f4 100644
--- a/tests/ServerTest.php
+++ b/tests/ServerTest.php
@@ -13,7 +13,6 @@
 
 class ServerTest extends TestCase
 {
-
     public function setUp(): void
     {
         error_reporting(-1);
diff --git a/tests/mock/MockSocket.php b/tests/mock/MockSocket.php
index e12d6ed..e51823d 100644
--- a/tests/mock/MockSocket.php
+++ b/tests/mock/MockSocket.php
@@ -8,7 +8,6 @@
 
 class MockSocket
 {
-
     private static $queue = [];
     private static $stored = [];
     private static $asserter;