diff --git a/docs/requirements.txt b/docs/requirements.txt
index 4c31138..a26bc24 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -16,7 +16,7 @@ docutils==0.22.4
     # via
     #   sphinx
     #   sphinx-rtd-theme
-idna==3.13
+idna==3.15
     # via requests
 imagesize==2.0.0
     # via sphinx