diff --git a/requirements-dev.txt b/requirements-dev.txt
index 51423d9..a730d1b 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -3,7 +3,7 @@ chardet==3.0.4
 coverage==4.5.4
 coveralls==1.10.0
 docopt==0.6.2
-idna==2.8
+idna==3.6
 nose==1.3.7
 urllib3==1.25.7
 requests==2.23.0