diff --git a/doc/requirements.txt b/doc/requirements.txt
index e47ad50..f3e0027 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -19,7 +19,7 @@ docutils==0.18.1
     #   breathe
     #   sphinx
     #   sphinx-rtd-theme
-idna==3.4
+idna==3.7
     # via requests
 imagesize==1.4.1
     # via sphinx