diff --git a/docs/requirements.txt b/docs/requirements.txt
index a392189..a82f9f1 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -10,7 +10,7 @@ babel==2.7.0              # via sphinx
 certifi==2019.6.16        # via requests
 chardet==3.0.4            # via requests
 docutils==0.15.2          # via sphinx
-idna==2.8                 # via requests
+idna==3.15                 # via requests
 imagesize==1.1.0          # via sphinx
 jinja2==2.10.1            # via sphinx
 markupsafe==1.1.1         # via jinja2