diff --git a/requirements.txt b/requirements.txt
index e3a7330..8494ac9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ Flask-Login==0.3.2
 Flask-Micropub==0.2.6
 Flask-SQLAlchemy==2.1
 html5lib==0.9999999
-idna==2.0
+idna==2.1
 itsdangerous==0.24
 Jinja2==2.8
 MarkupSafe==0.23