diff --git a/requirements-dev.txt b/requirements-dev.txt
index 9ca81c6..edd4ad9 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -41,7 +41,7 @@ cryptography==3.4.8; python_version >= '3.6'
 defusedxml==0.7.1; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'
 dill==0.3.1.1; python_version >= '2.6' and python_version != '3.0'
 distlib==0.3.2
-dnspython==2.1.0; python_version >= '3.6'
+dnspython==2.6.1; python_version >= '3.6'
 docopt==0.6.2
 docutils==0.16; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'
 email-validator==1.1.3; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'