diff --git a/requirements-dev.txt b/requirements-dev.txt
index 86d5383..477820c 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -2,7 +2,7 @@ certifi==2019.3.9
 chardet==3.0.4
 entrypoints==0.3
 flake8==3.7.7
-idna==2.8
+idna==3.11
 mccabe==0.6.1
 pycodestyle==2.5.0
 pyflakes==2.1.1