diff --git a/composer.json b/composer.json
index 69c7bf2..1579358 100644
--- a/composer.json
+++ b/composer.json
@@ -30,8 +30,6 @@
     "ext-sockets": "*"
   },
   "require-dev": {
-    "phpunit/phpunit": "^6.0",
-    "graze/telnet-client": "^2.1",
-    "miyahan/telnet": "^1.1"
+    "phpunit/phpunit": "^6.0"
   }
 }