diff --git a/contrib/requirements/requirements.txt b/contrib/requirements/requirements.txt
index b935a6844..8c308dfe2 100644
--- a/contrib/requirements/requirements.txt
+++ b/contrib/requirements/requirements.txt
@@ -10,4 +10,4 @@ attrs>=19.2.0
 
 # Note that we also need the dnspython[DNSSEC] extra which pulls in cryptography,
 # but as that is not pure-python it cannot be listed in this file!
-dnspython>=2.0
+dnspython>=2.0,<2.1