diff --git a/requirements.txt b/requirements.txt
index 13a1165..0fecc26 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ cffi==1.15.0
 chardet==4.0.0
 click==8.0.3
 coverage==6.2
-dnspython==2.2.0
+dnspython==2.6.0rc1
 email-validator==1.1.3
 flake8==3.8.4
 Flask==1.1.2