diff --git a/requirements/tox-tests.txt b/requirements/tox-tests.txt
index 7caa9333..06fb23aa 100644
--- a/requirements/tox-tests.txt
+++ b/requirements/tox-tests.txt
@@ -1,2 +1,2 @@
-idna==3.4
+idna==3.6
 treq==22.2.0