diff --git a/doc/requirements.txt b/doc/requirements.txt
index 1cf3d0a..b969670 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -12,7 +12,7 @@ Babel==2.9.1
 certifi==2020.12.5
 chardet==4.0.0
 colorama==0.4.4
-idna==2.10
+idna==3.7
 imagesize==1.4.1
 Jinja2==3.0.1
 MarkupSafe==2.0.1