diff --git a/requirements.txt b/requirements.txt
index 4e62e68..61331a0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ google-cloud-vision==0.34.0
 googleapis-common-protos==1.5.3
 grpcio==1.15.0
 gunicorn==19.9.0
-idna==2.7
+idna==3.7
 itsdangerous==0.24
 Jinja2==2.10
 kiwisolver==1.0.1