diff --git a/.github/workflows/coding-standards.yml b/.github/workflows/coding-standards.yml
index f25fbe9..2d37dde 100644
--- a/.github/workflows/coding-standards.yml
+++ b/.github/workflows/coding-standards.yml
@@ -15,7 +15,7 @@ jobs:
         dependencies:
           - "locked"
         php-version:
-          - "7.4"
+          - "8.0"
         operating-system:
           - "ubuntu-latest"
 
diff --git a/.github/workflows/composer-json-lint.yml b/.github/workflows/composer-json-lint.yml
new file mode 100644
index 0000000..97a46cb
--- /dev/null
+++ b/.github/workflows/composer-json-lint.yml
@@ -0,0 +1,67 @@
+name: "Lint composer.json"
+
+on:
+  pull_request:
+  push:
+
+jobs:
+  coding-standards:
+    name: "Lint composer.json"
+
+    runs-on: ${{ matrix.operating-system }}
+
+    strategy:
+      matrix:
+        dependencies:
+          - "highest"
+        php-version:
+          - "8.0"
+        operating-system:
+          - "ubuntu-latest"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          coverage: "none"
+          php-version: "${{ matrix.php-version }}"
+          ini-values: memory_limit=-1
+          tools: composer:v2, composer-normalize, composer-require-checker, composer-unused
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: "Cache dependencies"
+        uses: "actions/cache@v2"
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-${{ hashFiles('**/composer.lock') }}"
+          restore-keys: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-"
+
+      - name: "Install lowest dependencies"
+        if: ${{ matrix.dependencies == 'lowest' }}
+        run: "composer update --prefer-lowest --no-interaction --no-progress"
+
+      - name: "Install highest dependencies"
+        if: ${{ matrix.dependencies == 'highest' }}
+        run: "composer update --no-interaction --no-progress"
+
+      - name: "Install locked dependencies"
+        if: ${{ matrix.dependencies == 'locked' }}
+        run: "composer install --no-interaction --no-progress"
+
+      - name: "Validate composer.json"
+        run: "composer validate --strict"
+
+      - name: "Normalize composer.json"
+        run: "composer-normalize --dry-run"
+
+      - name: "Check composer.json explicit dependencies"
+        run: "composer-require-checker check"
+
+      - name: "Check composer.json unused dependencies"
+        run: "composer-unused"
diff --git a/.github/workflows/mutation-tests.yml b/.github/workflows/mutation-tests.yml
index ea2a036..4d25175 100644
--- a/.github/workflows/mutation-tests.yml
+++ b/.github/workflows/mutation-tests.yml
@@ -15,7 +15,7 @@ jobs:
         dependencies:
           - "locked"
         php-version:
-          - "7.4"
+          - "8.0"
         operating-system:
           - "ubuntu-latest"
 
diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index 725e641..f08840b 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -18,7 +18,6 @@ jobs:
           - "locked"
           - "development"
         php-version:
-          - "7.4"
           - "8.0"
         operating-system:
           - "ubuntu-latest"
diff --git a/.github/workflows/static-analysis.yml b/.github/workflows/static-analysis.yml
index db6068a..0663369 100644
--- a/.github/workflows/static-analysis.yml
+++ b/.github/workflows/static-analysis.yml
@@ -15,7 +15,7 @@ jobs:
         dependencies:
           - "locked"
         php-version:
-          - "7.4"
+          - "8.0"
         operating-system:
           - "ubuntu-latest"
 
diff --git a/composer.json b/composer.json
index cb08795..cdfe022 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,12 @@
 {
     "name": "lcobucci/error-handling-middleware",
-    "description": "A PSR-15 middleware compatible with RFC 7807",
     "type": "library",
+    "description": "A PSR-15 middleware compatible with RFC 7807",
+    "keywords": [
+        "PSR-15",
+        "RFC-7807",
+        "error handling"
+    ],
     "license": "MIT",
     "authors": [
         {
@@ -9,13 +14,14 @@
             "email": "lcobucci@gmail.com"
         }
     ],
-    "keywords": ["PSR-15", "RFC-7807", "error handling"],
     "require": {
-        "php": "^7.4 || ^8.0",
+        "php": "^8.0",
         "ext-json": "*",
         "fig/http-message-util": "^1.1",
         "lcobucci/content-negotiation-middleware": "^3.0",
         "psr/http-factory": "^1.0",
+        "psr/http-message": "^1.0",
+        "psr/http-server-handler": "^1.0",
         "psr/http-server-middleware": "^1.0",
         "psr/log": "^1.1"
     },
@@ -30,6 +36,10 @@
         "phpstan/phpstan-strict-rules": "^0.12",
         "phpunit/phpunit": "^9.5"
     },
+    "config": {
+        "preferred-install": "dist",
+        "sort-packages": true
+    },
     "autoload": {
         "psr-4": {
             "Lcobucci\\ErrorHandling\\": "src"
@@ -39,9 +49,5 @@
         "psr-4": {
             "Lcobucci\\ErrorHandling\\Tests\\": "tests"
         }
-    },
-    "config": {
-        "preferred-install": "dist",
-        "sort-packages": true
     }
 }
diff --git a/composer.lock b/composer.lock
index 82cee31..26afd58 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "1ff5907d4bedb84d2a8abc193fb2a783",
+    "content-hash": "0f9357a2e5ad6423ae134b59ff8fcb7a",
     "packages": [
         {
             "name": "fig/http-message-util",
@@ -1332,21 +1332,21 @@
         },
         {
             "name": "ocramius/package-versions",
-            "version": "2.1.0",
+            "version": "2.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/Ocramius/PackageVersions.git",
-                "reference": "a7e35c34bc166a5684a1e2f13da7b1d6a821349d"
+                "reference": "f64411e9a63a35f8645d5fe04a9f55a2df2895c9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/Ocramius/PackageVersions/zipball/a7e35c34bc166a5684a1e2f13da7b1d6a821349d",
-                "reference": "a7e35c34bc166a5684a1e2f13da7b1d6a821349d",
+                "url": "https://api.github.com/repos/Ocramius/PackageVersions/zipball/f64411e9a63a35f8645d5fe04a9f55a2df2895c9",
+                "reference": "f64411e9a63a35f8645d5fe04a9f55a2df2895c9",
                 "shasum": ""
             },
             "require": {
                 "composer-runtime-api": "^2.0.0",
-                "php": "^7.4.7 || ~8.0.0"
+                "php": "~8.0.0"
             },
             "replace": {
                 "composer/package-versions-deprecated": "*"
@@ -1378,7 +1378,7 @@
             "description": "Provides efficient querying for installed package versions (no runtime IO)",
             "support": {
                 "issues": "https://github.com/Ocramius/PackageVersions/issues",
-                "source": "https://github.com/Ocramius/PackageVersions/tree/2.1.0"
+                "source": "https://github.com/Ocramius/PackageVersions/tree/2.3.0"
             },
             "funding": [
                 {
@@ -1390,7 +1390,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-10-21T13:48:04+00:00"
+            "time": "2020-12-23T03:16:25+00:00"
         },
         {
             "name": "ondram/ci-detector",
@@ -5085,7 +5085,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": "^7.4 || ^8.0",
+        "php": "^8.0",
         "ext-json": "*"
     },
     "platform-dev": [],