diff --git a/composer.json b/composer.json
index 4a26ba956..ee7327432 100644
--- a/composer.json
+++ b/composer.json
@@ -43,7 +43,7 @@
     "require": {
         "php": "^8.0|^7.3",
         "ext-json": "*",
-        "justinrainbow/json-schema": "^5.2",
+        "justinrainbow/json-schema": "6.0.0-beta",
         "psr/http-message": "^1",
         "react/http": "^1.5",
         "symfony/console": "^5.4.9",
diff --git a/composer.lock b/composer.lock
index 3042e95e4..f5e7a3a5a 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "2e4a876ba583ea7b5ddf4bebd46c0262",
+    "content-hash": "a0a520c642607e90de15df4ee12cccbe",
     "packages": [
         {
             "name": "evenement/evenement",
@@ -109,25 +109,142 @@
             },
             "time": "2020-11-24T22:02:12+00:00"
         },
+        {
+            "name": "icecave/parity",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/icecave/parity.git",
+                "reference": "0109fef58b3230d23b20b2ac52ecdf477218d300"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/icecave/parity/zipball/0109fef58b3230d23b20b2ac52ecdf477218d300",
+                "reference": "0109fef58b3230d23b20b2ac52ecdf477218d300",
+                "shasum": ""
+            },
+            "require": {
+                "icecave/repr": "~1",
+                "php": ">=5.3"
+            },
+            "require-dev": {
+                "eloquent/liberator": "~1",
+                "icecave/archer": "~1"
+            },
+            "suggest": {
+                "eloquent/asplode": "Drop-in exception-based error handling."
+            },
+            "type": "library",
+            "autoload": {
+                "psr-0": {
+                    "Icecave\\Parity": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "James Harris",
+                    "email": "james.harris@icecave.com.au",
+                    "homepage": "https://github.com/jmalloc"
+                }
+            ],
+            "description": "A customizable deep comparison library.",
+            "homepage": "https://github.com/IcecaveStudios/parity",
+            "keywords": [
+                "compare",
+                "comparison",
+                "equal",
+                "equality",
+                "greater",
+                "less",
+                "sort",
+                "sorting"
+            ],
+            "support": {
+                "issues": "https://github.com/icecave/parity/issues",
+                "source": "https://github.com/icecave/parity/tree/1.0.0"
+            },
+            "time": "2014-01-17T05:56:27+00:00"
+        },
+        {
+            "name": "icecave/repr",
+            "version": "1.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/icecave/repr.git",
+                "reference": "8a3d2953adf5f464a06e3e2587aeacc97e2bed07"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/icecave/repr/zipball/8a3d2953adf5f464a06e3e2587aeacc97e2bed07",
+                "reference": "8a3d2953adf5f464a06e3e2587aeacc97e2bed07",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3"
+            },
+            "require-dev": {
+                "icecave/archer": "~1"
+            },
+            "suggest": {
+                "eloquent/asplode": "Drop-in exception-based error handling."
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Icecave\\Repr\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "James Harris",
+                    "email": "james.harris@icecave.com.au",
+                    "homepage": "https://github.com/jmalloc"
+                }
+            ],
+            "description": "A library for generating string representations of any value, inspired by Python's reprlib library.",
+            "homepage": "https://github.com/IcecaveStudios/repr",
+            "keywords": [
+                "human",
+                "readable",
+                "repr",
+                "representation",
+                "string"
+            ],
+            "support": {
+                "issues": "https://github.com/icecave/repr/issues",
+                "source": "https://github.com/icecave/repr/tree/1.0.1"
+            },
+            "time": "2014-07-25T05:44:41+00:00"
+        },
         {
             "name": "justinrainbow/json-schema",
-            "version": "5.2.11",
+            "version": "6.0.0-beta",
             "source": {
                 "type": "git",
-                "url": "https://github.com/justinrainbow/json-schema.git",
-                "reference": "2ab6744b7296ded80f8cc4f9509abbff393399aa"
+                "url": "https://github.com/jsonrainbow/json-schema.git",
+                "reference": "957ac43c49c92604221bafb8da48229edebe9380"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/justinrainbow/json-schema/zipball/2ab6744b7296ded80f8cc4f9509abbff393399aa",
-                "reference": "2ab6744b7296ded80f8cc4f9509abbff393399aa",
+                "url": "https://api.github.com/repos/jsonrainbow/json-schema/zipball/957ac43c49c92604221bafb8da48229edebe9380",
+                "reference": "957ac43c49c92604221bafb8da48229edebe9380",
                 "shasum": ""
             },
             "require": {
+                "icecave/parity": "1.0.0",
+                "marc-mabe/php-enum": "^2.0 || ^3.0 || ^4.0",
                 "php": ">=5.3.3"
             },
             "require-dev": {
-                "friendsofphp/php-cs-fixer": "~2.2.20||~2.15.1",
+                "friendsofphp/php-cs-fixer": "~2.2.20 || ~2.19.0",
                 "json-schema/json-schema-test-suite": "1.2.0",
                 "phpunit/phpunit": "^4.8.35"
             },
@@ -137,7 +254,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "5.0.x-dev"
+                    "dev-master": "6.x-dev"
                 }
             },
             "autoload": {
@@ -168,16 +285,89 @@
                 }
             ],
             "description": "A library to validate a json schema.",
-            "homepage": "https://github.com/justinrainbow/json-schema",
+            "homepage": "https://github.com/jsonrainbow/json-schema",
             "keywords": [
                 "json",
                 "schema"
             ],
             "support": {
-                "issues": "https://github.com/justinrainbow/json-schema/issues",
-                "source": "https://github.com/justinrainbow/json-schema/tree/5.2.11"
+                "issues": "https://github.com/jsonrainbow/json-schema/issues",
+                "source": "https://github.com/jsonrainbow/json-schema/tree/6.0.0-beta"
+            },
+            "time": "2024-07-09T07:19:24+00:00"
+        },
+        {
+            "name": "marc-mabe/php-enum",
+            "version": "v4.7.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/marc-mabe/php-enum.git",
+                "reference": "3da42cc1daceaf98c858e56f59d1ccd52b011fdc"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/marc-mabe/php-enum/zipball/3da42cc1daceaf98c858e56f59d1ccd52b011fdc",
+                "reference": "3da42cc1daceaf98c858e56f59d1ccd52b011fdc",
+                "shasum": ""
+            },
+            "require": {
+                "ext-reflection": "*",
+                "php": "^7.1 | ^8.0"
+            },
+            "require-dev": {
+                "phpbench/phpbench": "^0.16.10 || ^1.0.4",
+                "phpstan/phpstan": "^1.3.1",
+                "phpunit/phpunit": "^7.5.20 | ^8.5.22 | ^9.5.11",
+                "vimeo/psalm": "^4.17.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.6-dev",
+                    "dev-3.x": "3.2-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "MabeEnum\\": "src/"
+                },
+                "classmap": [
+                    "stubs/Stringable.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Marc Bennewitz",
+                    "email": "dev@mabe.berlin",
+                    "homepage": "https://mabe.berlin/",
+                    "role": "Lead"
+                }
+            ],
+            "description": "Simple and fast implementation of enumerations with native PHP",
+            "homepage": "https://github.com/marc-mabe/php-enum",
+            "keywords": [
+                "enum",
+                "enum-map",
+                "enum-set",
+                "enumeration",
+                "enumerator",
+                "enummap",
+                "enumset",
+                "map",
+                "set",
+                "type",
+                "type-hint",
+                "typehint"
+            ],
+            "support": {
+                "issues": "https://github.com/marc-mabe/php-enum/issues",
+                "source": "https://github.com/marc-mabe/php-enum/tree/v4.7.0"
             },
-            "time": "2021-07-22T09:24:00+00:00"
+            "time": "2022-04-19T02:21:46+00:00"
         },
         {
             "name": "psr/container",
@@ -4886,7 +5076,9 @@
     ],
     "aliases": [],
     "minimum-stability": "stable",
-    "stability-flags": [],
+    "stability-flags": {
+        "justinrainbow/json-schema": 10
+    },
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
@@ -4894,5 +5086,5 @@
         "ext-json": "*"
     },
     "platform-dev": [],
-    "plugin-api-version": "2.3.0"
+    "plugin-api-version": "2.6.0"
 }
diff --git a/tests/src/Importer/ImporterTest.php b/tests/src/Importer/ImporterTest.php
index 1f03602db..5f18749d2 100644
--- a/tests/src/Importer/ImporterTest.php
+++ b/tests/src/Importer/ImporterTest.php
@@ -4,24 +4,23 @@
 namespace Deployer\Importer;
 
 use Deployer\Deployer;
+use Deployer\Exception\ConfigurationException;
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Console\Application;
+use Symfony\Component\Console\Input\Input;
+use Symfony\Component\Console\Output\Output;
 
 class ImporterTest extends TestCase
 {
-    private $previousInput;
-    private $previousOutput;
-
     public function setUp(): void
     {
-        $deployer = Deployer::get();
-        $this->previousInput = $deployer->input;
-        $this->previousOutput = $deployer->output;
-    }
+        $console = new Application();
+        $input = $this->createMock(Input::class);
+        $output = $this->createMock(Output::class);
 
-    public function tearDown(): void
-    {
-        Deployer::get()->input = $this->previousInput;
-        Deployer::get()->output = $this->previousOutput;
+        $deployer = new Deployer($console);
+        $deployer->input = $input;
+        $deployer->output = $output;
     }
 
     public function testCanOneOverrideStaticMethod(): void
@@ -79,4 +78,19 @@ public function testImporterIgnoresYamlHiddenKeys(): void
         self::assertEquals('foo', Deployer::get()->hosts->get('acceptance')->getRemoteUser());
         self::assertEquals('bar', Deployer::get()->hosts->get('production')->getRemoteUser());
     }
+
+    public function testThrowsForInvalidConfig(): void
+    {
+        $data = <<<EOL
+unknownProperty: some-string-value
+EOL;
+        $tmpFile = tempnam(sys_get_temp_dir(), 'deployer-') . '.yaml';
+        file_put_contents($tmpFile, $data);
+
+        $this->expectException(ConfigurationException::class);
+        $this->expectExceptionMessageMatches('/' . basename($tmpFile) . '/');
+        $this->expectExceptionMessageMatches('/The property unknownProperty is not defined and the definition does not allow additional properties/');
+
+        Importer::import($tmpFile);
+    }
 }