diff --git a/.travis.yml b/.travis.yml
index 1c5e371..3f1d11c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,13 +1,12 @@
 language: php
 
 php:
-  - 7.1
-  - 7.2
   - 7.3
+  - 7.4
 
 sudo: false
 
-dist: trusty
+dist: bionic
 
 before_script:
   - composer self-update
diff --git a/README.md b/README.md
index f29a549..81238df 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,7 @@
 
 This is a HTTP/HTTPS proxy script that forwards requests to a different server and returns the response. The Proxy class uses PSR7 request/response objects as input/output, and uses Guzzle to do the actual HTTP request.
 
+
 ## Installation
 
 Install using composer:
@@ -34,11 +35,16 @@ $proxy = new Proxy(new GuzzleAdapter($guzzle));
 // Add a response filter that removes the encoding headers.
 $proxy->filter(new RemoveEncodingFilter());
 
-// Forward the request and get the response.
-$response = $proxy->forward($request)->to('http://example.com');
+try {
+    // Forward the request and get the response.
+    $response = $proxy->forward($request)->to('http://example.com');
 
-// Output response to the browser.
-(new Laminas\HttpHandlerRunner\Emitter\SapiEmitter)->emit($response);
+    // Output response to the browser.
+    (new Laminas\HttpHandlerRunner\Emitter\SapiEmitter)->emit($response);
+} catch(\GuzzleHttp\Exception\BadResponseException $e) {
+    // Correct way to handle bad responses
+    (new Laminas\HttpHandlerRunner\Emitter\SapiEmitter)->emit($e->getResponse());
+}
 ```
 
 ## Filters
diff --git a/composer.json b/composer.json
index d1c56b9..39e983a 100644
--- a/composer.json
+++ b/composer.json
@@ -16,17 +16,18 @@
         }
     ],
     "require": {
-        "php": "^5.6 || ^7.0",
+        "php": "^7.3 || ^8.0",
         "psr/http-message": "^1.0",
-        "guzzlehttp/guzzle": "^6.0",
-        "laminas/laminas-diactoros": "^2.0",
+        "guzzlehttp/guzzle": "^7.1",
+        "laminas/laminas-diactoros": "^2.5",
         "relay/relay": "^1.0",
-        "laminas/laminas-httphandlerrunner": "^1.1"
+        "laminas/laminas-httphandlerrunner": "^1.2"
     },
     "require-dev": {
-        "phpunit/phpunit": "^5.0|^6.0|^7.0",
-        "php-coveralls/php-coveralls": "^2.0",
-        "mockery/mockery": "^1.1"
+        "roave/security-advisories": "dev-latest",
+        "phpunit/phpunit": "^9.5",
+        "php-coveralls/php-coveralls": "^2.4",
+        "mockery/mockery": "^1.4"
     },
     "autoload": {
         "psr-4": {
diff --git a/phpunit.xml b/phpunit.xml
index 8034fdf..eb45487 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,22 +1,23 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit backupGlobals="false"
-         backupStaticAttributes="false"
-         bootstrap="vendor/autoload.php"
-         colors="true"
-         convertErrorsToExceptions="true"
-         convertNoticesToExceptions="true"
-         convertWarningsToExceptions="true"
-         processIsolation="false"
-         stopOnFailure="true"
->
-    <testsuites>
-        <testsuite name="PHPProxy Test Suite">
-            <directory>tests/Proxy/</directory>
-        </testsuite>
-    </testsuites>
-    <filter>
-        <whitelist>
-            <directory suffix=".php">./src</directory>
-        </whitelist>
-    </filter>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  backupGlobals="false"
+  backupStaticAttributes="false"
+  bootstrap="vendor/autoload.php"
+  colors="true"
+  convertErrorsToExceptions="true"
+  convertNoticesToExceptions="true"
+  convertWarningsToExceptions="true"
+  processIsolation="false"
+  stopOnFailure="true"
+  xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.5/phpunit.xsd">
+  <coverage>
+    <include>
+      <directory suffix=".php">./src</directory>
+    </include>
+  </coverage>
+  <testsuites>
+    <testsuite name="PHPProxy Test Suite">
+      <directory>tests/Proxy/</directory>
+    </testsuite>
+  </testsuites>
 </phpunit>
diff --git a/src/Proxy.php b/src/Proxy.php
index 630501f..42d4bfb 100644
--- a/src/Proxy.php
+++ b/src/Proxy.php
@@ -2,6 +2,7 @@
 
 namespace Proxy;
 
+use GuzzleHttp\Exception\ClientException;
 use Proxy\Adapter\AdapterInterface;
 use Proxy\Exception\UnexpectedValueException;
 use Psr\Http\Message\RequestInterface;
@@ -79,7 +80,11 @@ public function to($target)
         $stack = $this->filters;
 
         $stack[] = function (RequestInterface $request, ResponseInterface $response, callable $next) {
-            $response = $this->adapter->send($request);
+            try {
+                $response = $this->adapter->send($request);
+            } catch (ClientException $ex) {
+                $response = $ex->getResponse();
+            }
 
             return $next($request, $response);
         };
diff --git a/tests/Proxy/Adapter/Dummy/DummyAdapterTest.php b/tests/Proxy/Adapter/Dummy/DummyAdapterTest.php
index 62a869b..a4a52cc 100644
--- a/tests/Proxy/Adapter/Dummy/DummyAdapterTest.php
+++ b/tests/Proxy/Adapter/Dummy/DummyAdapterTest.php
@@ -13,7 +13,7 @@ class DummyAdapterTest extends TestCase
      */
     private $adapter;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->adapter = new DummyAdapter();
     }
diff --git a/tests/Proxy/Adapter/Guzzle/GuzzleAdapterTest.php b/tests/Proxy/Adapter/Guzzle/GuzzleAdapterTest.php
index 9f9940b..0bdc338 100644
--- a/tests/Proxy/Adapter/Guzzle/GuzzleAdapterTest.php
+++ b/tests/Proxy/Adapter/Guzzle/GuzzleAdapterTest.php
@@ -32,7 +32,7 @@ class GuzzleAdapterTest extends TestCase
      */
     private $body = 'Totally awesome response body';
 
-    public function setUp()
+    public function setUp(): void
     {
         $mock = new MockHandler([
             $this->createResponse(),
diff --git a/tests/Proxy/Filter/RemoveEncodingFilterTest.php b/tests/Proxy/Filter/RemoveEncodingFilterTest.php
index c407695..7a397ca 100644
--- a/tests/Proxy/Filter/RemoveEncodingFilterTest.php
+++ b/tests/Proxy/Filter/RemoveEncodingFilterTest.php
@@ -13,7 +13,7 @@ class RemoveEncodingFilterTest extends TestCase
      */
     private $filter;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->filter = new RemoveEncodingFilter();
     }
diff --git a/tests/Proxy/Filter/RemoveLocationFilterTest.php b/tests/Proxy/Filter/RemoveLocationFilterTest.php
index ea96bde..a9a4971 100644
--- a/tests/Proxy/Filter/RemoveLocationFilterTest.php
+++ b/tests/Proxy/Filter/RemoveLocationFilterTest.php
@@ -13,7 +13,7 @@ class RemoveLocationFilterTest extends TestCase
      */
     private $filter;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->filter = new RemoveLocationFilter();
     }
diff --git a/tests/Proxy/Filter/RewriteLocationFilterTest.php b/tests/Proxy/Filter/RewriteLocationFilterTest.php
index 3bcc5f4..c67b71e 100644
--- a/tests/Proxy/Filter/RewriteLocationFilterTest.php
+++ b/tests/Proxy/Filter/RewriteLocationFilterTest.php
@@ -11,7 +11,7 @@ class RewriteLocationFilterTest extends TestCase
      */
     private $filter;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->filter = new RewriteLocationFilter();
     }
diff --git a/tests/Proxy/ProxyTest.php b/tests/Proxy/ProxyTest.php
index b46017e..37f4359 100644
--- a/tests/Proxy/ProxyTest.php
+++ b/tests/Proxy/ProxyTest.php
@@ -17,17 +17,17 @@ class ProxyTest extends TestCase
      */
     private $proxy;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->proxy = new Proxy(new DummyAdapter());
     }
 
     /**
      * @test
-     * @expectedException UnexpectedValueException
      */
     public function to_throws_exception_if_no_request_is_given()
     {
+        $this->expectException('UnexpectedValueException');
         $this->proxy->to('http://www.example.com');
     }