diff --git a/requirements.txt b/requirements.txt
index c2886a7fe..d40e955af 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ Babel==2.6.0
 certifi==2018.4.16
 chardet==3.0.4
 docutils==0.14
-idna==2.7
+idna==3.7
 imagesize==1.0.0
 Jinja2==2.10
 MarkupSafe==1.0