diff --git a/composer.json b/composer.json
index 1fdac982..fb193d85 100644
--- a/composer.json
+++ b/composer.json
@@ -32,7 +32,6 @@
     "nikic/php-parser": "^v5.5.0",
     "ext-inotify": "*",
     "game-worker/kiri-pool": "~v1.0",
-    "monolog/monolog": "^3.9.0",
     "psr/container": "^2.0",
     "swiftmailer/swiftmailer": "^v6.3.0",
     "ext-mongodb": "*"