diff --git a/composer.json b/composer.json
index 95aa941..b93adb4 100644
--- a/composer.json
+++ b/composer.json
@@ -28,7 +28,7 @@
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         "php-di/php-di": "^6.0",
-        "slim/psr7": "^0.5",
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diff --git a/composer.lock b/composer.lock
index 9f8b953..cabf370 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,25 +4,27 @@
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@@ -42,7 +44,7 @@
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-                    "homepage": "http://www.php-fig.org/"
+                    "homepage": "https://www.php-fig.org/"
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@@ -54,7 +56,7 @@
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@@ -112,6 +114,7 @@
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@@ -372,12 +375,12 @@
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@@ -484,21 +487,21 @@
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@@ -518,7 +521,7 @@
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@@ -532,29 +535,29 @@
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@@ -582,7 +585,7 @@
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@@ -779,35 +782,39 @@
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                 "psr/http-message": "^1.0",
-                "ralouphie/getallheaders": "^3"
+                "ralouphie/getallheaders": "^3",
+                "symfony/polyfill-php80": "^1.22"
             },
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                 "psr/http-message-implementation": "1.0"
             },
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-                "phpstan/phpstan": "^0.10",
-                "phpunit/phpunit": "^6.0|^7.0",
-                "squizlabs/php_codesniffer": "^3.3"
+                "phpstan/phpstan": "^0.12",
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+                "squizlabs/php_codesniffer": "^3.6",
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@@ -848,7 +855,7 @@
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-            "time": "2019-08-18T16:50:29+00:00"
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@@ -1027,12 +1034,12 @@
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@@ -1085,12 +1092,12 @@
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@@ -1142,11 +1149,73 @@
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+                    "email": "p@tchwork.com"
+                },
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+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill backporting some PHP 5.6+ features to lower PHP versions",
+            "homepage": "https://symfony.com",
+            "keywords": [
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+                "polyfill",
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+            "time": "2019-11-27T13:56:44+00:00"
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+                "shasum": ""
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@@ -1154,6 +1223,10 @@
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+                },
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@@ -1163,7 +1236,7 @@
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                 }
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-            "description": "Symfony polyfill backporting some PHP 5.6+ features to lower PHP versions",
+            "description": "Symfony polyfill backporting some PHP 8.0+ features to lower PHP versions",
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@@ -1171,7 +1244,21 @@
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                 "shim"
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-            "time": "2019-11-27T13:56:44+00:00"
+            "funding": [
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+                    "type": "custom"
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+                {
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+                    "type": "github"
+                },
+                {
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+                    "type": "tidelift"
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+            "time": "2022-11-03T14:55:06+00:00"
         },
         {
             "name": "symfony/polyfill-util",
@@ -1343,6 +1430,20 @@
                 "constructor",
                 "instantiate"
             ],
+            "funding": [
+                {
+                    "url": "https://www.doctrine-project.org/sponsorship.html",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://www.patreon.com/phpdoctrine",
+                    "type": "patreon"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/doctrine%2Finstantiator",
+                    "type": "tidelift"
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@@ -1372,12 +1473,12 @@
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-                },
                 "files": [
                     "src/DeepCopy/deep_copy.php"
-                ]
+                ],
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+                }
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@@ -1959,6 +2060,7 @@
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@@ -2656,12 +2758,12 @@
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-                "url": "https://github.com/webmozart/assert.git",
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@@ -2711,5 +2813,6 @@
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