diff --git a/docs/requirements.txt b/docs/requirements.txt
index ce65531..0ab706f 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -6,7 +6,7 @@ chardet==4.0.0
 commonmark==0.9.1
 docutils==0.17.1
 flask-sphinx-themes==1.0.2
-idna==2.10
+idna==3.7
 imagesize==1.2.0
 jinja2==3.1.3
 markupsafe==2.0.1