diff --git a/requirements.txt b/requirements.txt
index cca04e7..8d84527 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ cffi==1.13.2
 chardet==3.0.4
 cryptography==3.3.2
 docutils==0.16
-idna==2.9
+idna==3.7
 imagesize==1.2.0
 Jinja2==2.11.3
 MarkupSafe==1.1.1