diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 13f00fb..cd4eb79 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -23,6 +23,7 @@ jobs:
         php-version:
           - "7.4"
           - "8.0"
+          - "8.1"
         operating-system:
           - "ubuntu-latest"
 
diff --git a/composer.json b/composer.json
index f2aeb0d..3de7a35 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
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-        "php": ">=7.4.2",
+        "php": "^7.4.2 || ^8.0 || ^8.1",
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     },
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diff --git a/composer.lock b/composer.lock
index b2ef853..65b2228 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,24 +4,24 @@
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+    "content-hash": "eb3ac22156a60241b90984ab55a4ada8",
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             "name": "aeon-php/calendar",
-            "version": "1.0.1",
+            "version": "1.0.2",
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                 "url": "https://github.com/aeon-php/calendar.git",
-                "reference": "5899c465ac30e8bf9d7dd324d1d711bccef694f1"
+                "reference": "9cc9b7b007e1703ab532ec204f864a6e8ce0147d"
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-                "reference": "5899c465ac30e8bf9d7dd324d1d711bccef694f1",
+                "url": "https://api.github.com/repos/aeon-php/calendar/zipball/9cc9b7b007e1703ab532ec204f864a6e8ce0147d",
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-                "php": "^7.4.2 || ^8.0"
+                "php": "^7.4.2 || ^8.0 || ^8.1"
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@@ -51,37 +51,31 @@
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-                "source": "https://github.com/aeon-php/calendar/tree/1.0.1"
+                "source": "https://github.com/aeon-php/calendar/tree/1.0.2"
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-            "funding": [
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-                    "url": "https://github.com/norberttech",
-                    "type": "github"
-                }
-            ],
-            "time": "2021-06-25T17:04:43+00:00"
+            "time": "2021-12-05T20:54:21+00:00"
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             "name": "aeon-php/calendar-holidays",
-            "version": "0.8.0",
+            "version": "0.9.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/aeon-php/calendar-holidays.git",
-                "reference": "7fa1472b0fbd5851e7f38e00e49aaba8c293e917"
+                "reference": "212f78c2f55d87d277e472603a71bf2125f128a2"
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-                "reference": "7fa1472b0fbd5851e7f38e00e49aaba8c293e917",
+                "url": "https://api.github.com/repos/aeon-php/calendar-holidays/zipball/212f78c2f55d87d277e472603a71bf2125f128a2",
+                "reference": "212f78c2f55d87d277e472603a71bf2125f128a2",
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             "require": {
                 "aeon-php/calendar": ">=0.14.0",
                 "ext-json": "*",
                 "ext-mbstring": "*",
-                "php": "^7.4.2 | ^8.0"
+                "php": "^7.4.2 || ^8.0 || ^8.1"
             },
             "require-dev": {
                 "flow-php/etl": "1.x@dev",
@@ -111,9 +105,9 @@
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                 "issues": "https://github.com/aeon-php/calendar-holidays/issues",
-                "source": "https://github.com/aeon-php/calendar-holidays/tree/0.8.0"
+                "source": "https://github.com/aeon-php/calendar-holidays/tree/0.9.0"
             },
-            "time": "2021-09-11T16:06:46+00:00"
+            "time": "2021-12-06T10:38:07+00:00"
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     ],
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@@ -122,7 +116,7 @@
     "prefer-stable": true,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=7.4.2"
+        "php": "^7.4.2 || ^8.0 || ^8.1"
     },
     "platform-dev": [],
     "plugin-api-version": "2.1.0"
diff --git a/tools/composer.json b/tools/composer.json
index 52c8431..4d0fd71 100644
--- a/tools/composer.json
+++ b/tools/composer.json
@@ -4,8 +4,8 @@
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         "vimeo/psalm": "^4.6",
-        "phpstan/phpstan": "^1.0.0",
-        "infection/infection": "^0.25.0",
+        "phpstan/phpstan": "^1.1.2",
+        "infection/infection": "^0.25.3",
         "friendsofphp/php-cs-fixer": "^3.1"
     }
 }
diff --git a/tools/composer.lock b/tools/composer.lock
index ae04094..66dca86 100644
--- a/tools/composer.lock
+++ b/tools/composer.lock
@@ -4,7 +4,7 @@
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-    "content-hash": "ab9bd2851ada2df6d2e8288cec78fcf8",
+    "content-hash": "83aed76cff2fb4530f061cd7bb75dd87",
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@@ -1949,23 +1949,23 @@
         },
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             "name": "phpunit/php-code-coverage",
-            "version": "9.2.7",
+            "version": "9.2.10",
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                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "d4c798ed8d51506800b441f7a13ecb0f76f12218"
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-                "reference": "d4c798ed8d51506800b441f7a13ecb0f76f12218",
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                 "ext-dom": "*",
                 "ext-libxml": "*",
                 "ext-xmlwriter": "*",
-                "nikic/php-parser": "^4.12.0",
+                "nikic/php-parser": "^4.13.0",
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@@ -2014,7 +2014,7 @@
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-                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/9.2.7"
+                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/9.2.10"
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@@ -2022,20 +2022,20 @@
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-            "time": "2021-09-17T05:39:03+00:00"
+            "time": "2021-12-05T09:12:13+00:00"
         },
         {
             "name": "phpunit/php-file-iterator",
-            "version": "3.0.5",
+            "version": "3.0.6",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-file-iterator.git",
-                "reference": "aa4be8575f26070b100fccb67faabb28f21f66f8"
+                "reference": "cf1c2e7c203ac650e352f4cc675a7021e7d1b3cf"
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-                "reference": "aa4be8575f26070b100fccb67faabb28f21f66f8",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-file-iterator/zipball/cf1c2e7c203ac650e352f4cc675a7021e7d1b3cf",
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@@ -2074,7 +2074,7 @@
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                 "issues": "https://github.com/sebastianbergmann/php-file-iterator/issues",
-                "source": "https://github.com/sebastianbergmann/php-file-iterator/tree/3.0.5"
+                "source": "https://github.com/sebastianbergmann/php-file-iterator/tree/3.0.6"
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@@ -2082,7 +2082,7 @@
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-            "time": "2020-09-28T05:57:25+00:00"
+            "time": "2021-12-02T12:48:52+00:00"
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@@ -2625,16 +2625,16 @@
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             "name": "sanmai/pipeline",
-            "version": "v5.1.0",
+            "version": "v5.2.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sanmai/pipeline.git",
-                "reference": "f935e10ddcb758c89829e7b69cfb1dc2b2638518"
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+                "reference": "2b5509a7635143165041109eb1c393c8515724f1",
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@@ -2642,14 +2642,14 @@
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-                "friendsofphp/php-cs-fixer": "^2.16",
+                "friendsofphp/php-cs-fixer": "^3",
                 "infection/infection": ">=0.10.5",
                 "league/pipeline": "^1.0 || ^0.3",
-                "phan/phan": "^1.1 || ^2.0 || ^3.0",
+                "phan/phan": ">=1.1",
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                 "phpstan/phpstan": ">=0.10",
                 "phpunit/phpunit": "^7.4 || ^8.1 || ^9.4",
-                "vimeo/psalm": "^2.0 || ^3.0 || ^4.0"
+                "vimeo/psalm": ">=2"
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             "extra": {
@@ -2678,7 +2678,7 @@
             "description": "General-purpose collections pipeline",
             "support": {
                 "issues": "https://github.com/sanmai/pipeline/issues",
-                "source": "https://github.com/sanmai/pipeline/tree/v5.1.0"
+                "source": "https://github.com/sanmai/pipeline/tree/v5.2.1"
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@@ -2686,7 +2686,7 @@
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-            "time": "2020-10-25T15:20:56+00:00"
+            "time": "2021-11-01T10:09:55+00:00"
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@@ -3117,16 +3117,16 @@
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-            "version": "4.0.3",
+            "version": "4.0.4",
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@@ -3175,14 +3175,14 @@
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-            "homepage": "http://www.github.com/sebastianbergmann/exporter",
+            "homepage": "https://www.github.com/sebastianbergmann/exporter",
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                 "exporter"
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             "support": {
                 "issues": "https://github.com/sebastianbergmann/exporter/issues",
-                "source": "https://github.com/sebastianbergmann/exporter/tree/4.0.3"
+                "source": "https://github.com/sebastianbergmann/exporter/tree/4.0.4"
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@@ -3190,7 +3190,7 @@
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-            "time": "2020-09-28T05:24:23+00:00"
+            "time": "2021-11-11T14:18:36+00:00"
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@@ -3883,22 +3883,22 @@
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+            "version": "v5.4.0",
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                 "url": "https://github.com/symfony/event-dispatcher.git",
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-                "symfony/event-dispatcher-contracts": "^2",
+                "symfony/deprecation-contracts": "^2.1|^3",
+                "symfony/event-dispatcher-contracts": "^2|^3",
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@@ -3910,13 +3910,13 @@
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-                "symfony/http-foundation": "^4.4|^5.0",
-                "symfony/service-contracts": "^1.1|^2",
-                "symfony/stopwatch": "^4.4|^5.0"
+                "symfony/config": "^4.4|^5.0|^6.0",
+                "symfony/dependency-injection": "^4.4|^5.0|^6.0",
+                "symfony/error-handler": "^4.4|^5.0|^6.0",
+                "symfony/expression-language": "^4.4|^5.0|^6.0",
+                "symfony/http-foundation": "^4.4|^5.0|^6.0",
+                "symfony/service-contracts": "^1.1|^2|^3",
+                "symfony/stopwatch": "^4.4|^5.0|^6.0"
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@@ -3948,7 +3948,7 @@
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             "homepage": "https://symfony.com",
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-                "source": "https://github.com/symfony/event-dispatcher/tree/v5.3.7"
+                "source": "https://github.com/symfony/event-dispatcher/tree/v5.4.0"
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@@ -3964,7 +3964,7 @@
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-            "time": "2021-08-04T21:20:46+00:00"
+            "time": "2021-11-23T10:19:22+00:00"
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@@ -4047,21 +4047,22 @@
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-            "version": "v5.3.4",
+            "version": "v5.4.0",
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                 "type": "git",
                 "url": "https://github.com/symfony/filesystem.git",
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+                "symfony/polyfill-mbstring": "~1.8",
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@@ -4090,7 +4091,7 @@
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-                "source": "https://github.com/symfony/filesystem/tree/v5.3.4"
+                "source": "https://github.com/symfony/filesystem/tree/v5.4.0"
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@@ -4106,24 +4107,25 @@
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-            "time": "2021-07-21T12:40:44+00:00"
+            "time": "2021-10-28T13:39:27+00:00"
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@@ -4152,7 +4154,7 @@
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-                "source": "https://github.com/symfony/finder/tree/v5.3.7"
+                "source": "https://github.com/symfony/finder/tree/v5.4.0"
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@@ -4168,25 +4170,25 @@
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+            "time": "2021-11-28T15:25:38+00:00"
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@@ -4221,7 +4223,7 @@
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@@ -4237,7 +4239,7 @@
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@@ -4882,16 +4884,16 @@
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-                "reference": "38f26c7d6ed535217ea393e05634cb0b244a1967",
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@@ -4924,7 +4926,7 @@
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-                "source": "https://github.com/symfony/process/tree/v5.3.7"
+                "source": "https://github.com/symfony/process/tree/v5.4.0"
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@@ -4940,7 +4942,7 @@
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-            "time": "2021-08-04T21:20:46+00:00"
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@@ -5027,21 +5029,21 @@
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-            "version": "v5.3.4",
+            "version": "v5.4.0",
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-                "reference": "b24c6a92c6db316fee69e38c80591e080e41536c"
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-                "reference": "b24c6a92c6db316fee69e38c80591e080e41536c",
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                 "php": ">=7.2.5",
-                "symfony/service-contracts": "^1.0|^2"
+                "symfony/service-contracts": "^1|^2|^3"
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@@ -5069,7 +5071,7 @@
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             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/stopwatch/tree/v5.3.4"
+                "source": "https://github.com/symfony/stopwatch/tree/v5.4.0"
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@@ -5085,7 +5087,7 @@
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-            "time": "2021-07-10T08:58:57+00:00"
+            "time": "2021-11-23T10:19:22+00:00"
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