diff --git a/requirements.txt b/requirements.txt
index 0a919fa..cbcce1f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ requests==2.24.0
 python-ldap==3.3.1
 pyotp==2.4.0
 qrcode==6.1
-dnspython==2.0.0
+dnspython>=1.16.0
 gunicorn==20.0.4
 python3-saml
 pyOpenSSL==19.1.0