diff --git a/requirements.txt b/requirements.txt
index 4f22293..70e1cbf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ whitenoise==3.2
 dj-database-url==0.4.0
 asgi_redis==1.0.0
 asgiref==0.13
-Twisted==15.5.0
+Twisted==21.2.0
 txaio==2.6.0
 zope.interface==4.1.3
 haikunator==1.0.1