diff --git a/composer.json b/composer.json
index 12fdb56..f5a386d 100644
--- a/composer.json
+++ b/composer.json
@@ -11,24 +11,25 @@
             "email": "nahid.dns@gmail.com"
         }
     ],
-  "require": {
-    "php": ">=5.5.0"
-  },
-  "require-dev": {
+    "require": {
+        "php": ">=5.5.0",
+        "psy/psysh": "@stable"
+    },
+    "require-dev": {
         "phpunit/phpunit": "^4.8 || ^5.0",
         "symfony/var-dumper": "^3.4",
         "graham-campbell/testbench": "^3.1"
-  },
-  "autoload": {
-    "psr-4": {
-      "Nahid\\JsonQ\\": "src/"
-    }
-  },
-  "autoload-dev": {
-    "psr-4": {
-      "Nahid\\JsonQ\\Tests\\": "tests/"
-    }
-  },
-  "minimum-stability": "dev",
-  "prefer-stable": true
+    },
+    "autoload": {
+        "psr-4": {
+            "Nahid\\JsonQ\\": "src/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Nahid\\JsonQ\\Tests\\": "tests/"
+        }
+    },
+    "minimum-stability": "dev",
+    "prefer-stable": true
 }