diff --git a/composer.json b/composer.json
index 4444bc2..fe0fd39 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,8 @@
     }
   },
   "require": {
-    "php": "^7.4 || ^8.0"
+    "php": "^7.4 || ^8.0",
+    "ext-json": "*"
   },
   "require-dev": {
     "phpunit/phpunit": "^9.5",
diff --git a/composer.lock b/composer.lock
index 1897277..c425829 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": "b332a82e682b8c31af8afc42b9353ea3",
+    "content-hash": "90eecf44ea84544e4c2a84f219bad999",
     "packages": [],
     "packages-dev": [
         {
@@ -1947,12 +1947,12 @@
             "version": "1.9.1",
             "source": {
                 "type": "git",
-                "url": "https://github.com/webmozart/assert.git",
+                "url": "https://github.com/webmozarts/assert.git",
                 "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/bafc69caeb4d49c39fd0779086c03a3738cbb389",
+                "url": "https://api.github.com/repos/webmozarts/assert/zipball/bafc69caeb4d49c39fd0779086c03a3738cbb389",
                 "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389",
                 "shasum": ""
             },
@@ -1998,7 +1998,8 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": "^7.4 || ^8.0"
+        "php": "^7.4 || ^8.0",
+        "ext-json": "*"
     },
     "platform-dev": []
 }