diff --git a/requirements.txt b/requirements.txt
index c120a8f..7f4f51f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ Babel==2.5.1
 certifi==2017.11.5
 chardet==3.0.4
 docutils==0.14
-idna==2.6
+idna==3.7
 imagesize==0.7.1
 Jinja2==3.1.3
 MarkupSafe==1.0