diff --git a/.github/workflows/coding-standards.yml b/.github/workflows/coding-standards.yml
index 88ae260..48e6e8c 100644
--- a/.github/workflows/coding-standards.yml
+++ b/.github/workflows/coding-standards.yml
@@ -20,6 +20,7 @@ jobs:
           - "locked"
         php-version:
           - "7.4"
+          - "8.0"
         operating-system:
           - "ubuntu-latest"
 
diff --git a/.github/workflows/mutation-tests.yml b/.github/workflows/mutation-tests.yml
index 13d3319..6dd4c41 100644
--- a/.github/workflows/mutation-tests.yml
+++ b/.github/workflows/mutation-tests.yml
@@ -20,6 +20,7 @@ jobs:
           - "locked"
         php-version:
           - "7.4"
+          - "8.0"
         operating-system:
           - "ubuntu-latest"
 
@@ -60,4 +61,4 @@ jobs:
         env:
           INFECTION_BADGE_API_KEY: ${{ secrets.INFECTION_BADGE_API_KEY }}
           STRYKER_DASHBOARD_API_KEY: ${{ secrets.STRYKER_DASHBOARD_API_KEY }}
-  
+
diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index c915b02..3955178 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -20,6 +20,7 @@ jobs:
           - "locked"
         php-version:
           - "7.4"
+          - "8.0"
         operating-system:
           - "ubuntu-latest"
 
diff --git a/.github/workflows/psalm.yml b/.github/workflows/psalm.yml
index 332b2dd..be3c708 100644
--- a/.github/workflows/psalm.yml
+++ b/.github/workflows/psalm.yml
@@ -20,6 +20,7 @@ jobs:
           - "locked"
         php-version:
           - "7.4"
+          - "8.0"
         operating-system:
           - "ubuntu-latest"
 
diff --git a/composer.json b/composer.json
index 914b37a..e5f58b2 100644
--- a/composer.json
+++ b/composer.json
@@ -14,15 +14,15 @@
         }
     ],
     "require": {
-        "php": "^7.4.0",
+        "php": "^7.4.0|^8.0",
         "ext-json": "*",
         "composer-plugin-api": "^2.1"
     },
     "require-dev": {
-        "composer/composer": "1.10.10",
+        "composer/composer": "^2.1",
         "infection/infection": "^0.21.5",
         "mikey179/vfsstream": "^1.6",
-        "phpro/grumphp": "^0.17.1 || ^0.19.0 || ^0.20.0",
+        "phpro/grumphp": "^1.0",
         "phpstan/phpstan": "^1.2.0",
         "phpunit/phpunit": "^9.2",
         "squizlabs/php_codesniffer": "^3.4",