diff --git a/authn-service/requirements.txt b/authn-service/requirements.txt
index 96f4ca2..dafa833 100644
--- a/authn-service/requirements.txt
+++ b/authn-service/requirements.txt
@@ -6,7 +6,7 @@ cryptography==2.6.1
 entrypoints==0.3
 Flask==1.1.2
 Flask-Cors==3.0.8
-idna==2.10
+idna==3.6
 django-two-factor-auth==1.12
 itsdangerous==1.1.0
 Jinja2==2.11.2