diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0e29b9a6bc..7b78f4dca2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,11 +17,13 @@ jobs:
     runs-on: ubuntu-latest
 
     strategy:
+      fail-fast: false
       matrix:
         php:
           - '7.3'
           - '7.4'
           - '8.0'
+          - '8.1'
         laravel:
           - 6.*
           - 7.*
@@ -32,15 +34,27 @@ jobs:
         include:
           - laravel: '6.*'
             testbench: '4.*'
+            phpunit: '^8.5.8|^9.3.3'
           - laravel: '7.*'
             testbench: '5.*'
+            phpunit: '^8.5.8|^9.3.3'
           - laravel: '8.*'
             testbench: '6.*'
+            phpunit: '^9.3.3'
         exclude:
           - php: '8.0'
             laravel: 6.*
+            prefer: 'prefer-lowest'
           - php: '8.0'
             laravel: 7.*
+            prefer: 'prefer-lowest'
+          - php: '8.1'
+            laravel: 6.*
+          - php: '8.1'
+            laravel: 7.*
+          - php: '8.1'
+            laravel: 8.*
+            prefer: 'prefer-lowest'
 
     name: PHP ${{ matrix.php }} - Laravel ${{ matrix.laravel }} --${{ matrix.prefer }}
 
@@ -67,7 +81,7 @@ jobs:
 
     - name: Install dependencies
       run: |
-        composer require "laravel/framework:${{ matrix.laravel }}" "orchestra/testbench-browser-kit:${{ matrix.testbench }}" "orchestra/database:${{ matrix.testbench }}" --no-interaction --no-update
+        composer require "laravel/framework:${{ matrix.laravel }}" "phpunit/phpunit:${{ matrix.phpunit }}" "orchestra/testbench-browser-kit:${{ matrix.testbench }}" "orchestra/database:${{ matrix.testbench }}" --no-interaction --no-update
         composer update --${{ matrix.prefer }} --prefer-dist --no-interaction --no-suggest
 
     - name: Run tests for Local
diff --git a/composer.json b/composer.json
index 1894b867d7..38322cc4ca 100644
--- a/composer.json
+++ b/composer.json
@@ -30,10 +30,10 @@
     ],
     "require": {
         "cboden/ratchet": "^0.4.1",
-        "clue/redis-react": "^2.3",
+        "clue/redis-react": "^2.5",
         "evenement/evenement": "^2.0|^3.0",
         "facade/ignition-contracts": "^1.0",
-        "guzzlehttp/psr7": "^1.5|^2.0",
+        "guzzlehttp/psr7": "^1.7|^2.0",
         "illuminate/broadcasting": "^6.3|^7.0|^8.0",
         "illuminate/console": "^6.3|^7.0|^8.0",
         "illuminate/http": "^6.3|^7.0|^8.0",
@@ -41,15 +41,15 @@
         "illuminate/routing": "^6.3|^7.0|^8.0",
         "illuminate/support": "^6.3|^7.0|^8.0",
         "pusher/pusher-php-server": "^3.0|^4.0|^5.0|^6.0|^7.0",
-        "react/promise": "^2.0",
-        "symfony/http-kernel": "^4.0|^5.0",
+        "react/promise": "^2.8",
+        "symfony/http-kernel": "^4.4|^5.4",
         "symfony/psr-http-message-bridge": "^1.1|^2.0"
     },
     "require-dev": {
         "clue/block-react": "^1.4",
         "laravel/legacy-factories": "^1.1",
         "orchestra/testbench-browser-kit": "^4.0|^5.0|^6.0",
-        "phpunit/phpunit": "^8.0|^9.0"
+        "phpunit/phpunit": "^8.5.8|^9.3.3"
     },
     "suggest": {
         "ext-pcntl": "Running the server needs pcntl to listen to command signals and soft-shutdown.",
diff --git a/src/API/Controller.php b/src/API/Controller.php
index 965b16d993..4647ad4534 100644
--- a/src/API/Controller.php
+++ b/src/API/Controller.php
@@ -6,6 +6,7 @@
 use BeyondCode\LaravelWebSockets\Contracts\ChannelManager;
 use BeyondCode\LaravelWebSockets\Server\QueryParameters;
 use Exception;
+use GuzzleHttp\Psr7\Message;
 use GuzzleHttp\Psr7\Response;
 use GuzzleHttp\Psr7\ServerRequest;
 use Illuminate\Http\JsonResponse;
@@ -139,7 +140,7 @@ public function onError(ConnectionInterface $connection, Exception $exception)
             'error' => $exception->getMessage(),
         ]));
 
-        tap($connection)->send(\GuzzleHttp\Psr7\str($response))->close();
+        tap($connection)->send(Message::toString($response))->close();
     }
 
     /**
diff --git a/src/Dashboard/Http/Controllers/SendMessage.php b/src/Dashboard/Http/Controllers/SendMessage.php
index 781cbaf01b..bad161d05c 100644
--- a/src/Dashboard/Http/Controllers/SendMessage.php
+++ b/src/Dashboard/Http/Controllers/SendMessage.php
@@ -4,8 +4,8 @@
 
 use BeyondCode\LaravelWebSockets\Concerns\PushesToPusher;
 use BeyondCode\LaravelWebSockets\Rules\AppId;
-use Exception;
 use Illuminate\Http\Request;
+use Throwable;
 
 class SendMessage
 {
@@ -42,7 +42,7 @@ public function __invoke(Request $request)
                 $request->event,
                 $decodedData ?: []
             );
-        } catch (Exception $e) {
+        } catch (Throwable $e) {
             return response()->json([
                 'ok' => false,
                 'exception' => $e->getMessage(),
diff --git a/src/Server/HealthHandler.php b/src/Server/HealthHandler.php
index 73186c4fd2..949cc337ea 100644
--- a/src/Server/HealthHandler.php
+++ b/src/Server/HealthHandler.php
@@ -3,6 +3,7 @@
 namespace BeyondCode\LaravelWebSockets\Server;
 
 use Exception;
+use GuzzleHttp\Psr7\Message;
 use GuzzleHttp\Psr7\Response;
 use Psr\Http\Message\RequestInterface;
 use Ratchet\ConnectionInterface;
@@ -25,7 +26,7 @@ public function onOpen(ConnectionInterface $connection, RequestInterface $reques
             json_encode(['ok' => true])
         );
 
-        tap($connection)->send(\GuzzleHttp\Psr7\str($response))->close();
+        tap($connection)->send(Message::toString($response))->close();
     }
 
     /**