diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..44cf796
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,93 @@
+name: CI [Backend]
+
+on: push
+
+jobs:
+    check-codestyle:
+        name: Check codestyle
+        runs-on: ubuntu-latest
+        steps:
+            -   name: Checkout
+                uses: actions/checkout@v3
+
+            -   name: Setup PHP
+                uses: shivammathur/setup-php@v2
+                with:
+                    php-version: 8.2
+                    extensions: bcmath, dom, fileinfo, filter, gd, hash, intl, libxml, json, mbstring, mysqli, pcre, pdo_mysql, zip, zlib
+                    coverage: none
+
+                env:
+                    COMPOSER_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+            -   name: Install PHP dependencies
+                run: composer install --no-interaction --no-progress
+
+            -   name: Check PHP codestyle
+                run: tools/php-cs-fixer/vendor/bin/php-cs-fixer fix --dry-run -vvv --ansi
+
+            -   name: Run static analysis
+                run: tools/phpstan/vendor/bin/phpstan analyze src/ --level max --memory-limit=-1 --ansi
+
+    unit-tests:
+        name: Unit tests
+        runs-on: ubuntu-latest
+        steps:
+            -   name: Checkout
+                uses: actions/checkout@v3
+
+            -   name: Setup PHP
+                uses: shivammathur/setup-php@v2
+                with:
+                    php-version: 8.2
+                    extensions: bcmath, dom, fileinfo, filter, gd, hash, intl, libxml, json, mbstring, mysqli, pcre, pdo_mysql, zip, zlib
+                    coverage: none
+
+                env:
+                    COMPOSER_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+            -   name: Install the dependencies
+                run: composer install --no-interaction --no-progress
+
+            -   name: Run unit tests
+                run: tools/phpunit/vendor/bin/phpunit --colors=always
+
+    check-composer-requirements:
+        name: Check Composer requirements
+        runs-on: ubuntu-latest
+        steps:
+            -   name: Checkout
+                uses: actions/checkout@v3
+
+            -   name: Setup PHP
+                uses: shivammathur/setup-php@v2
+                with:
+                    php-version: 8.2
+                    extensions: bcmath, dom, fileinfo, filter, gd, hash, intl, json, mbstring, mysqli, pcre, pdo_mysql, zip, zlib
+                    coverage: none
+
+                env:
+                    COMPOSER_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+            -   name: Install the dependencies
+                run: composer install --no-interaction --no-progress
+
+            -   name: Check the dependencies
+                run: tools/require-checker/vendor/bin/composer-require-checker check --config-file=tools/require-checker/config.json composer.json --ansi
+
+    security-check:
+        name: PHP Security Check
+        runs-on: ubuntu-latest
+        steps:
+            -   name: Checkout
+                uses: actions/checkout@v3
+
+            -   name: Setup cache
+                uses: actions/cache@v2
+                id: cache-db
+                with:
+                    path: ~/.symfony/cache
+                    key: db
+
+            -   name: Run security check
+                uses: symfonycorp/security-checker-action@v3
diff --git a/composer.json b/composer.json
index 627ddfe..50ec191 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
         "ext-dom": "*",
         "ext-libxml": "*",
         "spatie/url": "^2.3",
-        "symfony/http-client": "^5.0|^6.0|^7.0"
+        "symfony/http-client-contracts": "^3.4"
     },
     "require-dev": {
         "bamarni/composer-bin-plugin": "^1.8"
@@ -45,16 +45,15 @@
         "post-update-cmd": [
             "@composer bin all update --ansi"
         ],
-        "fix": [
-            "@php tools/php-cs-fixer/vendor/bin/php-cs-fixer fix -vvv --ansi"
-        ],
-        "php-cs-fixer": [
-            "@php tools/php-cs-fixer/vendor/bin/php-cs-fixer fix --dry-run -vvv --ansi"
-        ],
+        "fix": "@php tools/php-cs-fixer/vendor/bin/php-cs-fixer fix -vvv --ansi",
+        "php-cs-fixer": "@php tools/php-cs-fixer/vendor/bin/php-cs-fixer fix --dry-run -vvv --ansi",
         "phpunit": "@php tools/phpunit/vendor/bin/phpunit",
+        "phpstan": "@php tools/phpstan/vendor/bin/phpstan analyze src/ --level max --memory-limit=-1 --ansi",
         "pipeline": [
             "@php-cs-fixer",
+            "@phpstan",
             "@phpunit"
-        ]
+        ],
+        "require-checker": "@php tools/require-checker/vendor/bin/composer-require-checker check --config-file=tools/require-checker/config.json composer.json --ansi"
     }
 }
diff --git a/composer.lock b/composer.lock
index 7886e81..7cafbfc 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,61 +4,8 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "11bf3e826c703dc2850b161ea875a6bf",
+    "content-hash": "e859cf614a2ca34f0f2b912d8efcd257",
     "packages": [
-        {
-            "name": "psr/container",
-            "version": "2.0.2",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/php-fig/container.git",
-                "reference": "c71ecc56dfe541dbd90c5360474fbc405f8d5963"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/container/zipball/c71ecc56dfe541dbd90c5360474fbc405f8d5963",
-                "reference": "c71ecc56dfe541dbd90c5360474fbc405f8d5963",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=7.4.0"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "2.0.x-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Psr\\Container\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "PHP-FIG",
-                    "homepage": "https://www.php-fig.org/"
-                }
-            ],
-            "description": "Common Container Interface (PHP FIG PSR-11)",
-            "homepage": "https://github.com/php-fig/container",
-            "keywords": [
-                "PSR-11",
-                "container",
-                "container-interface",
-                "container-interop",
-                "psr"
-            ],
-            "support": {
-                "issues": "https://github.com/php-fig/container/issues",
-                "source": "https://github.com/php-fig/container/tree/2.0.2"
-            },
-            "time": "2021-11-05T16:47:00+00:00"
-        },
         {
             "name": "psr/http-message",
             "version": "2.0",
@@ -112,56 +59,6 @@
             },
             "time": "2023-04-04T09:54:51+00:00"
         },
-        {
-            "name": "psr/log",
-            "version": "3.0.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/php-fig/log.git",
-                "reference": "fe5ea303b0887d5caefd3d431c3e61ad47037001"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/log/zipball/fe5ea303b0887d5caefd3d431c3e61ad47037001",
-                "reference": "fe5ea303b0887d5caefd3d431c3e61ad47037001",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=8.0.0"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "3.x-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Psr\\Log\\": "src"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "PHP-FIG",
-                    "homepage": "https://www.php-fig.org/"
-                }
-            ],
-            "description": "Common interface for logging libraries",
-            "homepage": "https://github.com/php-fig/log",
-            "keywords": [
-                "log",
-                "psr",
-                "psr-3"
-            ],
-            "support": {
-                "source": "https://github.com/php-fig/log/tree/3.0.0"
-            },
-            "time": "2021-07-14T16:46:02+00:00"
-        },
         {
             "name": "spatie/macroable",
             "version": "2.0.0",
@@ -274,98 +171,6 @@
             ],
             "time": "2024-01-05T10:09:13+00:00"
         },
-        {
-            "name": "symfony/http-client",
-            "version": "v7.0.3",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/http-client.git",
-                "reference": "3d2605c07cd14aec294f72f5bf8147702f7a5ada"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/symfony/http-client/zipball/3d2605c07cd14aec294f72f5bf8147702f7a5ada",
-                "reference": "3d2605c07cd14aec294f72f5bf8147702f7a5ada",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=8.2",
-                "psr/log": "^1|^2|^3",
-                "symfony/http-client-contracts": "^3",
-                "symfony/service-contracts": "^2.5|^3"
-            },
-            "conflict": {
-                "php-http/discovery": "<1.15",
-                "symfony/http-foundation": "<6.4"
-            },
-            "provide": {
-                "php-http/async-client-implementation": "*",
-                "php-http/client-implementation": "*",
-                "psr/http-client-implementation": "1.0",
-                "symfony/http-client-implementation": "3.0"
-            },
-            "require-dev": {
-                "amphp/amp": "^2.5",
-                "amphp/http-client": "^4.2.1",
-                "amphp/http-tunnel": "^1.0",
-                "amphp/socket": "^1.1",
-                "guzzlehttp/promises": "^1.4",
-                "nyholm/psr7": "^1.0",
-                "php-http/httplug": "^1.0|^2.0",
-                "psr/http-client": "^1.0",
-                "symfony/dependency-injection": "^6.4|^7.0",
-                "symfony/http-kernel": "^6.4|^7.0",
-                "symfony/messenger": "^6.4|^7.0",
-                "symfony/process": "^6.4|^7.0",
-                "symfony/stopwatch": "^6.4|^7.0"
-            },
-            "type": "library",
-            "autoload": {
-                "psr-4": {
-                    "Symfony\\Component\\HttpClient\\": ""
-                },
-                "exclude-from-classmap": [
-                    "/Tests/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Nicolas Grekas",
-                    "email": "p@tchwork.com"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Provides powerful methods to fetch HTTP resources synchronously or asynchronously",
-            "homepage": "https://symfony.com",
-            "keywords": [
-                "http"
-            ],
-            "support": {
-                "source": "https://github.com/symfony/http-client/tree/v7.0.3"
-            },
-            "funding": [
-                {
-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
-                }
-            ],
-            "time": "2024-01-29T15:41:16+00:00"
-        },
         {
             "name": "symfony/http-client-contracts",
             "version": "v3.4.0",
@@ -443,88 +248,6 @@
                 }
             ],
             "time": "2023-07-30T20:28:31+00:00"
-        },
-        {
-            "name": "symfony/service-contracts",
-            "version": "v3.4.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/service-contracts.git",
-                "reference": "fe07cbc8d837f60caf7018068e350cc5163681a0"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/symfony/service-contracts/zipball/fe07cbc8d837f60caf7018068e350cc5163681a0",
-                "reference": "fe07cbc8d837f60caf7018068e350cc5163681a0",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=8.1",
-                "psr/container": "^1.1|^2.0"
-            },
-            "conflict": {
-                "ext-psr": "<1.1|>=2"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-main": "3.4-dev"
-                },
-                "thanks": {
-                    "name": "symfony/contracts",
-                    "url": "https://github.com/symfony/contracts"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Symfony\\Contracts\\Service\\": ""
-                },
-                "exclude-from-classmap": [
-                    "/Test/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Nicolas Grekas",
-                    "email": "p@tchwork.com"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Generic abstractions related to writing services",
-            "homepage": "https://symfony.com",
-            "keywords": [
-                "abstractions",
-                "contracts",
-                "decoupling",
-                "interfaces",
-                "interoperability",
-                "standards"
-            ],
-            "support": {
-                "source": "https://github.com/symfony/service-contracts/tree/v3.4.1"
-            },
-            "funding": [
-                {
-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
-                }
-            ],
-            "time": "2023-12-26T14:02:43+00:00"
         }
     ],
     "packages-dev": [
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..7a7137f
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,2 @@
+includes:
+parameters:
diff --git a/src/FaviconFetcher.php b/src/FaviconFetcher.php
index 95d3822..aa8f923 100644
--- a/src/FaviconFetcher.php
+++ b/src/FaviconFetcher.php
@@ -11,6 +11,9 @@
 
 class FaviconFetcher
 {
+    /**
+     * @param iterable<int, StrategyInterface> $strategies
+     */
     public function __construct(
         private readonly HttpClientInterface $client,
         private readonly iterable $strategies,
diff --git a/src/Result/FaviconCollection.php b/src/Result/FaviconCollection.php
index feb40e4..da45780 100644
--- a/src/Result/FaviconCollection.php
+++ b/src/Result/FaviconCollection.php
@@ -7,7 +7,7 @@
 class FaviconCollection
 {
     /**
-     * @var array<Favicon>
+     * @var array<int, Favicon>
      */
     private array $items = [];
 
@@ -18,6 +18,9 @@ public function add(Favicon $favicon): self
         return $this;
     }
 
+    /**
+     * @return array<int, Favicon>
+     */
     public function getAll(): array
     {
         return $this->items;
diff --git a/src/Strategy/AppleTouchIconStrategy.php b/src/Strategy/AppleTouchIconStrategy.php
index 42b34a6..5c032da 100644
--- a/src/Strategy/AppleTouchIconStrategy.php
+++ b/src/Strategy/AppleTouchIconStrategy.php
@@ -17,20 +17,19 @@ public function __construct(
     ) {
     }
 
-    public function find(string $url, \DOMXPath $xpath): ?FaviconCollection
+    public function find(string $url, \DOMXPath $xpath): FaviconCollection
     {
+        $collection = new FaviconCollection();
         $elements = $xpath->query('/html/head/link[starts-with(@rel, "apple-touch-icon")]');
 
         if (false === $elements) {
-            return null;
+            return $collection;
         }
 
-        $collection = new FaviconCollection();
-
         /** @var \DOMElement $element */
         foreach ($elements as $element) {
-            $href = $element->attributes->getNamedItem('href')?->textContent;
-            $size = $element->attributes->getNamedItem('sizes')?->textContent;
+            $href = (string) $element->attributes->getNamedItem('href')?->textContent;
+            $size = (string) $element->attributes->getNamedItem('sizes')?->textContent;
 
             try {
                 [$width, $height] = $this->sizeParser->parse($size);
diff --git a/src/Strategy/RelIconStrategy.php b/src/Strategy/RelIconStrategy.php
index ec8a2c2..adcd4d8 100644
--- a/src/Strategy/RelIconStrategy.php
+++ b/src/Strategy/RelIconStrategy.php
@@ -17,20 +17,19 @@ public function __construct(
     ) {
     }
 
-    public function find(string $url, \DOMXPath $xpath): ?FaviconCollection
+    public function find(string $url, \DOMXPath $xpath): FaviconCollection
     {
+        $collection = new FaviconCollection();
         $elements = $xpath->query('/html/head/link[@rel="icon"]');
 
         if (false === $elements) {
-            return null;
+            return $collection;
         }
 
-        $collection = new FaviconCollection();
-
         /** @var \DOMElement $element */
         foreach ($elements as $element) {
-            $href = $element->attributes->getNamedItem('href')?->textContent;
-            $size = $element->attributes->getNamedItem('sizes')?->textContent;
+            $href = (string) $element->attributes->getNamedItem('href')?->textContent;
+            $size = (string) $element->attributes->getNamedItem('sizes')?->textContent;
 
             try {
                 [$width, $height] = $this->sizeParser->parse($size);
diff --git a/src/Strategy/StrategyInterface.php b/src/Strategy/StrategyInterface.php
index d0df873..c4c5d11 100644
--- a/src/Strategy/StrategyInterface.php
+++ b/src/Strategy/StrategyInterface.php
@@ -8,5 +8,5 @@
 
 interface StrategyInterface
 {
-    public function find(string $url, \DOMXPath $xpath): ?FaviconCollection;
+    public function find(string $url, \DOMXPath $xpath): FaviconCollection;
 }
diff --git a/tools/phpstan/composer.json b/tools/phpstan/composer.json
new file mode 100644
index 0000000..0cba013
--- /dev/null
+++ b/tools/phpstan/composer.json
@@ -0,0 +1,10 @@
+{
+    "license": "proprietary",
+    "type": "project",
+    "php": ">=8.1",
+    "require-dev": {
+        "phpstan/phpstan": "^1.0",
+        "phpstan/phpstan-doctrine": "^1.0",
+        "phpstan/phpstan-symfony": "^1.0"
+    }
+}
diff --git a/tools/phpstan/composer.lock b/tools/phpstan/composer.lock
new file mode 100644
index 0000000..fab16fd
--- /dev/null
+++ b/tools/phpstan/composer.lock
@@ -0,0 +1,225 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "5bcbf13b3786c7ead6476f8ea9076a30",
+    "packages": [],
+    "packages-dev": [
+        {
+            "name": "phpstan/phpstan",
+            "version": "1.10.59",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpstan/phpstan.git",
+                "reference": "e607609388d3a6d418a50a49f7940e8086798281"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/e607609388d3a6d418a50a49f7940e8086798281",
+                "reference": "e607609388d3a6d418a50a49f7940e8086798281",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2|^8.0"
+            },
+            "conflict": {
+                "phpstan/phpstan-shim": "*"
+            },
+            "bin": [
+                "phpstan",
+                "phpstan.phar"
+            ],
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "PHPStan - PHP Static Analysis Tool",
+            "keywords": [
+                "dev",
+                "static analysis"
+            ],
+            "support": {
+                "docs": "https://phpstan.org/user-guide/getting-started",
+                "forum": "https://github.com/phpstan/phpstan/discussions",
+                "issues": "https://github.com/phpstan/phpstan/issues",
+                "security": "https://github.com/phpstan/phpstan/security/policy",
+                "source": "https://github.com/phpstan/phpstan-src"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/ondrejmirtes",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/phpstan",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/phpstan/phpstan",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2024-02-20T13:59:13+00:00"
+        },
+        {
+            "name": "phpstan/phpstan-doctrine",
+            "version": "1.3.62",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpstan/phpstan-doctrine.git",
+                "reference": "f3abbd8e93e12fed8091be3aeec216b06bed0950"
+            },
+            "dist": {
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+                "i18n",
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+                }
+            ],
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+                "validate"
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+}
diff --git a/tools/require-checker/config.json b/tools/require-checker/config.json
new file mode 100644
index 0000000..9964bf1
--- /dev/null
+++ b/tools/require-checker/config.json
@@ -0,0 +1,21 @@
+{
+  "symbol-whitelist" : [
+    "null", "true", "false",
+    "static", "self", "parent",
+    "array", "string", "int", "float", "bool", "iterable", "callable", "void", "object", "mixed", "never",
+    "K_PATH_MAIN"
+  ],
+  "php-core-extensions" : [
+    "Core",
+    "date",
+    "pcre",
+    "Phar",
+    "Reflection",
+    "SPL",
+    "standard"
+  ],
+  "scan-files" : [
+    "bin/console",
+    "public/index.php"
+  ]
+}