diff --git a/.github/workflows/cgl.yaml b/.github/workflows/cgl.yaml
index 0fa1068..176d3ed 100644
--- a/.github/workflows/cgl.yaml
+++ b/.github/workflows/cgl.yaml
@@ -46,6 +46,8 @@ jobs:
         run: composer lint:composer
       - name: Lint Editorconfig
         run: composer lint:editorconfig
+      - name: Lint JSON
+        run: composer lint:json
       - name: Lint PHP
         run: composer lint:php -- --format=checkstyle | cs2pr
 
@@ -56,3 +58,7 @@ jobs:
       # Migration
       - name: Rector migration
         run: composer migration:rector -- --dry-run
+
+      # Schema
+      - name: Validate configuration schema
+        run: composer validate-schema
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 259a2a4..ea9d5c0 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -29,6 +29,7 @@ composer lint
 # Specific linters
 composer lint:composer
 composer lint:editorconfig
+composer lint:json
 composer lint:php
 
 # Fix all CGL issues
@@ -37,6 +38,7 @@ composer fix
 # Fix specific CGL issues
 composer fix:composer
 composer fix:editorconfig
+composer fix:json
 composer fix:php
 ```
 
@@ -50,6 +52,14 @@ composer sca
 composer sca:php
 ```
 
+## Validate configuration schema
+
+```bash
+composer validate-schema
+```
+
+💡 You need a local Docker installation for this command.
+
 ## Run tests
 
 ```bash
diff --git a/composer.json b/composer.json
index d178a41..429d753 100644
--- a/composer.json
+++ b/composer.json
@@ -50,7 +50,8 @@
 		"phpstan/phpstan-symfony": "^1.1",
 		"phpstan/phpstan-webmozart-assert": "^1.2",
 		"phpunit/phpunit": "^10.1 || ^11.0",
-		"rector/rector": "^1.0.0"
+		"rector/rector": "^1.0.0",
+		"seld/jsonlint": "^1.10"
 	},
 	"suggest": {
 		"gmostafa/php-graphql-client": "Used to perform GraphQL requests within GithubVcsProvider (^1.13)"
@@ -79,18 +80,22 @@
 		"fix": [
 			"@fix:composer",
 			"@fix:editorconfig",
+			"@fix:json",
 			"@fix:php"
 		],
 		"fix:composer": "@composer normalize",
 		"fix:editorconfig": "@lint:editorconfig --fix",
+		"fix:json": "@lint:json",
 		"fix:php": "php-cs-fixer fix",
 		"lint": [
 			"@lint:composer",
 			"@lint:editorconfig",
+			"@lint:json",
 			"@lint:php"
 		],
 		"lint:composer": "@fix:composer --dry-run",
 		"lint:editorconfig": "ec",
+		"lint:json": "jsonlint resources/configuration.schema.json",
 		"lint:php": "@fix:php --dry-run",
 		"migration": [
 			"@migration:rector"
@@ -104,6 +109,7 @@
 			"phpstan analyse -c phpstan.neon"
 		],
 		"test": "@test:coverage --no-coverage",
-		"test:coverage": "phpunit -c phpunit.xml"
+		"test:coverage": "phpunit -c phpunit.xml",
+		"validate-schema": "docker run --rm -v \"$(pwd)\":/code swaggest/json-cli json-cli validate-schema resources/configuration.schema.json"
 	}
 }
diff --git a/composer.lock b/composer.lock
index 4c278c8..5e397ef 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": "621ae78d5928fde03c79cc1a7905d085",
+    "content-hash": "d2465dee0563f645975da7345a95467b",
     "packages": [
         {
             "name": "ergebnis/json",
@@ -5038,6 +5038,70 @@
             ],
             "time": "2023-02-07T11:34:05+00:00"
         },
+        {
+            "name": "seld/jsonlint",
+            "version": "1.10.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/Seldaek/jsonlint.git",
+                "reference": "9bb7db07b5d66d90f6ebf542f09fc67d800e5259"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/Seldaek/jsonlint/zipball/9bb7db07b5d66d90f6ebf542f09fc67d800e5259",
+                "reference": "9bb7db07b5d66d90f6ebf542f09fc67d800e5259",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3 || ^7.0 || ^8.0"
+            },
+            "require-dev": {
+                "phpstan/phpstan": "^1.5",
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.0 || ^8.5.13"
+            },
+            "bin": [
+                "bin/jsonlint"
+            ],
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Seld\\JsonLint\\": "src/Seld/JsonLint/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Jordi Boggiano",
+                    "email": "j.boggiano@seld.be",
+                    "homepage": "https://seld.be"
+                }
+            ],
+            "description": "JSON Linter",
+            "keywords": [
+                "json",
+                "linter",
+                "parser",
+                "validator"
+            ],
+            "support": {
+                "issues": "https://github.com/Seldaek/jsonlint/issues",
+                "source": "https://github.com/Seldaek/jsonlint/tree/1.10.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/Seldaek",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/seld/jsonlint",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2024-02-07T12:57:50+00:00"
+        },
         {
             "name": "symfony/event-dispatcher",
             "version": "v6.4.3",