diff --git a/docs-requirements.txt b/docs-requirements.txt
index 2f41d56..ed45691 100644
--- a/docs-requirements.txt
+++ b/docs-requirements.txt
@@ -18,7 +18,7 @@ cryptography==2.9.2
     # via -r docs-requirements.in
 docutils==0.17.1
     # via sphinx
-idna==2.10
+idna==3.2
     # via
     #   -r docs-requirements.in
     #   requests