diff --git a/requirements.txt b/requirements.txt
index 5afab7b2..fcd43083 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,4 +17,4 @@ pymysql
 # the vTPM tests require it
 barbican-tempest-plugin<=1.6.0;python_version<='3.6'
 barbican-tempest-plugin;python_version>'3.6'
-ddt>=1.7.2
+ddt>=1.6.0