diff --git a/doc/requirements.txt b/doc/requirements.txt
index 1b18005..9e09303 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -2,7 +2,7 @@ sphinx
 sphinx_rtd_theme
 pbr==2.0.0
 oslo.config==2.1.0
-Twisted==16.0.0
+Twisted==19.2.1
 Flask==1.0
 Flask-HTTPAuth==2.5.0
 netaddr>=0.7.12