diff --git a/composer.json b/composer.json
index 0d77822..35cc4e2 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
     "require": {
         "php": "^8.0",
         "guzzlehttp/guzzle": "^7.0",
-        "emartech/escher": "^3.0"
+        "emartech/escher": "^4.0"
     },
     "require-dev": {
         "phpunit/phpunit": "9.*",
diff --git a/composer.lock b/composer.lock
index 384076c..e268309 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,32 +4,33 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "f43680ea5d645d8dcc982a40b9ce515a",
+    "content-hash": "e19908645646a6ef2417afcecff9d510",
     "packages": [
         {
             "name": "emartech/escher",
-            "version": "3.0.0",
+            "version": "4.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/emartech/escher-php.git",
-                "reference": "e4d4bd2e3e1098a551112752c92cc597244c6a11"
+                "reference": "6bd3e07838ffb12ae8ee04cf29458a6a5e26a89e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/emartech/escher-php/zipball/e4d4bd2e3e1098a551112752c92cc597244c6a11",
-                "reference": "e4d4bd2e3e1098a551112752c92cc597244c6a11",
+                "url": "https://api.github.com/repos/emartech/escher-php/zipball/6bd3e07838ffb12ae8ee04cf29458a6a5e26a89e",
+                "reference": "6bd3e07838ffb12ae8ee04cf29458a6a5e26a89e",
                 "shasum": ""
             },
             "require": {
+                "ext-json": "*",
                 "php": ">=7.3"
             },
             "require-dev": {
-                "phpunit/phpunit": "9.5.3"
+                "phpunit/phpunit": "9.6.19"
             },
             "type": "library",
             "autoload": {
                 "psr-4": {
-                    "": "src/"
+                    "Escher\\": "src/Escher"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -71,9 +72,9 @@
             ],
             "support": {
                 "issues": "https://github.com/emartech/escher-php/issues",
-                "source": "https://github.com/emartech/escher-php/tree/3.0.0"
+                "source": "https://github.com/emartech/escher-php/tree/4.0.0"
             },
-            "time": "2021-11-18T12:24:57+00:00"
+            "time": "2024-06-14T13:50:20+00:00"
         },
         {
             "name": "guzzlehttp/guzzle",