diff --git a/.github/workflows/php-psr.yml b/.github/workflows/php-psr.yml
index 4e61ca9..a1a4a94 100644
--- a/.github/workflows/php-psr.yml
+++ b/.github/workflows/php-psr.yml
@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: [ '7.4' ]
+        php: [ '7.4' ,'8.0' ,'8.1' ]
     steps:
       - uses: actions/checkout@v2
         name: Checkout
@@ -18,7 +18,7 @@ jobs:
       - uses: shivammathur/setup-php@v2
         name: Setup PHP
         with:
-          php-version: 7.4
+          php-version: ${{ matrix.php }}
           extensions: curl, mbstring, mysql, soap, xml
           tools: composer
           ini-values: session.gc_probability=0, date.timezone="Europe/Prague", display_startup_errors = Off
diff --git a/composer.json b/composer.json
index 8ecffda..302b9ca 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
   "type": "library",
   "license": "GPL-3.0-or-later",
   "require": {
-    "php": ">= 7.4 <8.1",
+    "php": ">= 7.4",
     "ext-dom": "*",
     "ext-soap": "*"
   },
diff --git a/composer.lock b/composer.lock
index 9dce201..83cc9f6 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,24 +1,24 @@
 {
     "_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#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "91a94c30b0a6620952debb6d71f28c0a",
+    "content-hash": "b074362b32310c1261001900cd7dc81c",
     "packages": [],
     "packages-dev": [
         {
             "name": "squizlabs/php_codesniffer",
-            "version": "3.6.0",
+            "version": "3.6.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/squizlabs/PHP_CodeSniffer.git",
-                "reference": "ffced0d2c8fa8e6cdc4d695a743271fab6c38625"
+                "reference": "5e4e71592f69da17871dba6e80dd51bce74a351a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/squizlabs/PHP_CodeSniffer/zipball/ffced0d2c8fa8e6cdc4d695a743271fab6c38625",
-                "reference": "ffced0d2c8fa8e6cdc4d695a743271fab6c38625",
+                "url": "https://api.github.com/repos/squizlabs/PHP_CodeSniffer/zipball/5e4e71592f69da17871dba6e80dd51bce74a351a",
+                "reference": "5e4e71592f69da17871dba6e80dd51bce74a351a",
                 "shasum": ""
             },
             "require": {
@@ -56,7 +56,12 @@
                 "phpcs",
                 "standards"
             ],
-            "time": "2021-04-09T00:54:41+00:00"
+            "support": {
+                "issues": "https://github.com/squizlabs/PHP_CodeSniffer/issues",
+                "source": "https://github.com/squizlabs/PHP_CodeSniffer",
+                "wiki": "https://github.com/squizlabs/PHP_CodeSniffer/wiki"
+            },
+            "time": "2021-12-12T21:44:58+00:00"
         }
     ],
     "aliases": [],
@@ -65,9 +70,10 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">= 7.4 <8.1",
+        "php": ">= 7.4",
         "ext-dom": "*",
         "ext-soap": "*"
     },
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "2.1.0"
 }