diff --git a/requirements.txt b/requirements.txt
index 2d277ce..33e71d5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ flask-login==0.4.0
 flask-moment==0.5.2
 flask==0.12.2
 gunicorn==19.7.1
-idna==2.6                 # via requests
+idna==3.9                 # via requests
 itsdangerous==0.24        # via flask
 jinja2==2.9.6             # via flask
 listparser==0.18