diff --git a/.github/workflows/coding-standards.yml b/.github/workflows/coding-standards.yml
index 17b8f496..8069708e 100644
--- a/.github/workflows/coding-standards.yml
+++ b/.github/workflows/coding-standards.yml
@@ -15,7 +15,7 @@ jobs:
         dependencies:
           - "locked"
         php-version:
-          - "8.0"
+          - "8.1"
         operating-system:
           - "ubuntu-latest"
 
diff --git a/.github/workflows/mutation-tests.yml b/.github/workflows/mutation-tests.yml
index 154d5251..153e51cf 100644
--- a/.github/workflows/mutation-tests.yml
+++ b/.github/workflows/mutation-tests.yml
@@ -15,7 +15,7 @@ jobs:
         dependencies:
           - "locked"
         php-version:
-          - "8.0"
+          - "8.1"
         operating-system:
           - "ubuntu-latest"
 
diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index 3b3cc6b7..b87fb6b4 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -18,7 +18,6 @@ jobs:
           - "locked"
           - "development"
         php-version:
-          - "8.0"
           - "8.1"
         operating-system:
           - "ubuntu-latest"
diff --git a/.github/workflows/static-analysis.yml b/.github/workflows/static-analysis.yml
index 9528d8ee..504c079f 100644
--- a/.github/workflows/static-analysis.yml
+++ b/.github/workflows/static-analysis.yml
@@ -15,7 +15,7 @@ jobs:
         dependencies:
           - "locked"
         php-version:
-          - "8.0"
+          - "8.1"
         operating-system:
           - "ubuntu-latest"
 
diff --git a/composer.json b/composer.json
index f34dbfd6..6db5354f 100644
--- a/composer.json
+++ b/composer.json
@@ -10,17 +10,17 @@
         }
     ],
     "require": {
-        "php": "^8.0",
+        "php": "^8.1",
         "stella-maris/clock": "^0.1.4"
     },
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         "infection/infection": "^0.26",
         "lcobucci/coding-standard": "^8.0",
         "phpstan/extension-installer": "^1.1",
-        "phpstan/phpstan": "^0.12",
-        "phpstan/phpstan-deprecation-rules": "^0.12",
-        "phpstan/phpstan-phpunit": "^0.12",
-        "phpstan/phpstan-strict-rules": "^0.12",
+        "phpstan/phpstan": "^1.8",
+        "phpstan/phpstan-deprecation-rules": "^1.0",
+        "phpstan/phpstan-phpunit": "^1.1",
+        "phpstan/phpstan-strict-rules": "^1.3",
         "phpunit/phpunit": "^9.5"
     },
     "autoload": {
@@ -35,6 +35,11 @@
     },
     "config": {
         "preferred-install": "dist",
-        "sort-packages": true
+        "sort-packages": true,
+        "allow-plugins": {
+            "dealerdirect/phpcodesniffer-composer-installer": true,
+            "infection/extension-installer": true,
+            "phpstan/extension-installer": true
+        }
     }
 }
diff --git a/composer.lock b/composer.lock
index b368b057..b3713ec6 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
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     ],
-    "content-hash": "af17ecc7a44ca3cbe4c0e08e7842b997",
+    "content-hash": "bc54d206e56cbdeea420fa5d429a8252",
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@@ -1391,16 +1391,16 @@
         },
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-            "version": "1.6.3",
+            "version": "1.6.4",
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                 "url": "https://github.com/phpstan/phpdoc-parser.git",
-                "reference": "4a07085f74cb1f3fc7103efa537d9f00ebb74ec7"
+                "reference": "135607f9ccc297d6923d49c2bcf309f509413215"
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-                "reference": "4a07085f74cb1f3fc7103efa537d9f00ebb74ec7",
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@@ -1430,26 +1430,26 @@
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-                "source": "https://github.com/phpstan/phpdoc-parser/tree/1.6.3"
+                "source": "https://github.com/phpstan/phpdoc-parser/tree/1.6.4"
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-            "time": "2022-06-14T11:40:08+00:00"
+            "time": "2022-06-26T13:09:08+00:00"
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-            "version": "0.12.99",
+            "version": "1.8.2",
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-                "reference": "b4d40f1d759942f523be267a1bab6884f46ca3f7"
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-                "reference": "b4d40f1d759942f523be267a1bab6884f46ca3f7",
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+                "reference": "c53312ecc575caf07b0e90dee43883fdf90ca67c",
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-                "php": "^7.1|^8.0"
+                "php": "^7.2|^8.0"
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@@ -1459,11 +1459,6 @@
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@@ -1476,7 +1471,7 @@
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-                "source": "https://github.com/phpstan/phpstan/tree/0.12.99"
+                "source": "https://github.com/phpstan/phpstan/tree/1.8.2"
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@@ -1496,36 +1491,35 @@
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-            "time": "2021-09-12T20:09:55+00:00"
+            "time": "2022-07-20T09:57:31+00:00"
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-            "version": "0.12.6",
+            "version": "1.0.0",
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                 "url": "https://github.com/phpstan/phpstan-deprecation-rules.git",
-                "reference": "46dbd43c2db973d2876d6653e53f5c2cc3a01fbb"
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-                "reference": "46dbd43c2db973d2876d6653e53f5c2cc3a01fbb",
+                "url": "https://api.github.com/repos/phpstan/phpstan-deprecation-rules/zipball/e5ccafb0dd8d835dd65d8d7a1a0d2b1b75414682",
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                 "php": "^7.1 || ^8.0",
-                "phpstan/phpstan": "^0.12.60"
+                "phpstan/phpstan": "^1.0"
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                 "php-parallel-lint/php-parallel-lint": "^1.2",
-                "phpstan/phpstan-phpunit": "^0.12",
-                "phpunit/phpunit": "^7.5.20"
+                "phpstan/phpstan-phpunit": "^1.0",
+                "phpunit/phpunit": "^9.5"
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-                    "dev-master": "0.12-dev"
+                    "dev-master": "1.0-dev"
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@@ -1545,41 +1539,39 @@
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-                "source": "https://github.com/phpstan/phpstan-deprecation-rules/tree/0.12.6"
+                "source": "https://github.com/phpstan/phpstan-deprecation-rules/tree/1.0.0"
             },
-            "time": "2020-12-13T10:20:54+00:00"
+            "time": "2021-09-23T11:02:21+00:00"
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             "name": "phpstan/phpstan-phpunit",
-            "version": "0.12.22",
+            "version": "1.1.1",
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-                "reference": "7c01ef93bf128b4ac8bdad38c54b2a4fd6b0b3cc"
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-                "reference": "7c01ef93bf128b4ac8bdad38c54b2a4fd6b0b3cc",
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-                "php": "^7.1 || ^8.0",
-                "phpstan/phpstan": "^0.12.92"
+                "php": "^7.2 || ^8.0",
+                "phpstan/phpstan": "^1.5.0"
             },
             "conflict": {
                 "phpunit/phpunit": "<7.0"
             },
             "require-dev": {
+                "nikic/php-parser": "^4.13.0",
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-                "phpstan/phpstan-strict-rules": "^0.12.6",
+                "phpstan/phpstan-strict-rules": "^1.0",
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@@ -1599,38 +1591,36 @@
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                 "issues": "https://github.com/phpstan/phpstan-phpunit/issues",
-                "source": "https://github.com/phpstan/phpstan-phpunit/tree/0.12.22"
+                "source": "https://github.com/phpstan/phpstan-phpunit/tree/1.1.1"
             },
-            "time": "2021-08-12T10:53:43+00:00"
+            "time": "2022-04-20T15:24:25+00:00"
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-            "version": "0.12.11",
+            "version": "1.3.0",
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                 "url": "https://github.com/phpstan/phpstan-strict-rules.git",
-                "reference": "2b72e8e17d2034145f239126e876e5fb659675e2"
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-                "php": "^7.1 || ^8.0",
-                "phpstan/phpstan": "^0.12.96"
+                "php": "^7.2 || ^8.0",
+                "phpstan/phpstan": "^1.7.15"
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+                "nikic/php-parser": "^4.13.0",
                 "php-parallel-lint/php-parallel-lint": "^1.2",
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@@ -1649,9 +1639,9 @@
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                 "issues": "https://github.com/phpstan/phpstan-strict-rules/issues",
-                "source": "https://github.com/phpstan/phpstan-strict-rules/tree/0.12.11"
+                "source": "https://github.com/phpstan/phpstan-strict-rules/tree/1.3.0"
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-            "time": "2021-08-21T11:36:27+00:00"
+            "time": "2022-06-24T06:47:20+00:00"
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@@ -2075,22 +2065,27 @@
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+            "version": "2.0.2",
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                 "url": "https://github.com/php-fig/container.git",
-                "reference": "513e0666f7216c7459170d56df27dfcefe1689ea"
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+            "extra": {
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+            },
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@@ -2117,22 +2112,22 @@
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-                "source": "https://github.com/php-fig/container/tree/1.1.2"
+                "source": "https://github.com/php-fig/container/tree/2.0.2"
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-            "time": "2021-11-05T16:50:12+00:00"
+            "time": "2021-11-05T16:47:00+00:00"
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-            "version": "2.0.0",
+            "version": "3.0.0",
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@@ -2141,7 +2136,7 @@
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+                    "dev-master": "3.x-dev"
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@@ -2167,9 +2162,9 @@
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-                "source": "https://github.com/php-fig/log/tree/2.0.0"
+                "source": "https://github.com/php-fig/log/tree/3.0.0"
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-            "time": "2021-07-14T16:41:46+00:00"
+            "time": "2021-07-14T16:46:02+00:00"
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@@ -3441,46 +3436,42 @@
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-            "version": "v5.4.9",
+            "version": "v6.0.10",
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                 "url": "https://github.com/symfony/console.git",
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-                "php": ">=7.2.5",
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+                "php": ">=8.0.2",
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-                "symfony/lock": "<4.4",
-                "symfony/process": "<4.4"
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+                "symfony/dotenv": "<5.4",
+                "symfony/event-dispatcher": "<5.4",
+                "symfony/lock": "<5.4",
+                "symfony/process": "<5.4"
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+                "psr/log": "^1|^2|^3",
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@@ -3520,74 +3511,7 @@
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@@ -3651,7 +3574,7 @@
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@@ -3714,7 +3635,7 @@
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+            "version": "v6.0.8",
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+                "php": ">=8.0.2"
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@@ -4268,7 +4026,7 @@
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-                "source": "https://github.com/symfony/process/tree/v5.4.8"
+                "source": "https://github.com/symfony/process/tree/v6.0.8"
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@@ -4284,26 +4042,25 @@
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+            "time": "2022-04-12T16:11:42+00:00"
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-            "version": "v2.5.1",
+            "version": "v3.0.2",
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+                "php": ">=8.0.2",
+                "psr/container": "^2.0"
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@@ -4314,7 +4071,7 @@
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+                    "dev-main": "3.0-dev"
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@@ -4351,7 +4108,7 @@
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+                "source": "https://github.com/symfony/service-contracts/tree/v3.0.2"
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@@ -4367,38 +4124,37 @@
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+            "time": "2022-05-30T19:17:58+00:00"
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-            "version": "v5.4.9",
+            "version": "v6.0.10",
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                 "url": "https://github.com/symfony/string.git",
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+                "php": ">=8.0.2",
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                 "symfony/polyfill-intl-normalizer": "~1.0",
-                "symfony/polyfill-mbstring": "~1.0",
-                "symfony/polyfill-php80": "~1.15"
+                "symfony/polyfill-mbstring": "~1.0"
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             "conflict": {
-                "symfony/translation-contracts": ">=3.0"
+                "symfony/translation-contracts": "<2.0"
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-                "symfony/translation-contracts": "^1.1|^2",
-                "symfony/var-exporter": "^4.4|^5.0|^6.0"
+                "symfony/error-handler": "^5.4|^6.0",
+                "symfony/http-client": "^5.4|^6.0",
+                "symfony/translation-contracts": "^2.0|^3.0",
+                "symfony/var-exporter": "^5.4|^6.0"
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@@ -4437,7 +4193,7 @@
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+                "source": "https://github.com/symfony/string/tree/v6.0.10"
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@@ -4453,20 +4209,20 @@
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+            "time": "2022-06-26T16:34:50+00:00"
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-            "version": "v2.2.1",
+            "version": "v2.2.2",
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                 "url": "https://github.com/thecodingmachine/safe.git",
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@@ -4589,9 +4345,9 @@
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-                "source": "https://github.com/thecodingmachine/safe/tree/v2.2.1"
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+            "time": "2022-07-20T17:46:34+00:00"
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@@ -4708,7 +4464,7 @@
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-        "php": "^8.0"
+        "php": "^8.1"
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diff --git a/src/SystemClock.php b/src/SystemClock.php
index 437c5f46..69de81f8 100644
--- a/src/SystemClock.php
+++ b/src/SystemClock.php
@@ -10,7 +10,7 @@
 
 final class SystemClock implements Clock
 {
-    public function __construct(private DateTimeZone $timezone)
+    public function __construct(private readonly DateTimeZone $timezone)
     {
     }