diff --git a/requirements.txt b/requirements.txt
index 2a94d742d..7d857a8c9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-Twisted>=13.1.0
+Twisted>=13.1.0,!=18.4.0
 lxml
 pyOpenSSL
 cssselect>=0.9