diff --git a/backend/cluster.py b/backend/cluster.py
index eceaea98fd7420db07d54e3c6f02daf5d3d05152..c3338eb24d43895d7c147a1ddd92d89c7e5f00d6 100644
--- a/backend/cluster.py
+++ b/backend/cluster.py
@@ -27,7 +27,7 @@ USERNAMES: list[str] = [
     'xilin',
     'lairale',
     'lvaquero',
-    'hxuan',
+    'visanche',
     'dmeng',
     'wguo',
     'xbie',
diff --git a/requirements.txt b/requirements.txt
index 033ebd0cf8f550a15684c6655b4e01cfe6f3c326..158b8205ec01e642b165808a1180e41712ded539 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,3 +2,4 @@ eventlet
 python-socketio
 termcolor
 numpy
+matplotlib