diff --git a/tcp_tests/requirements.txt b/tcp_tests/requirements.txt
index 43c9f0c..6686d70 100644
--- a/tcp_tests/requirements.txt
+++ b/tcp_tests/requirements.txt
@@ -23,6 +23,7 @@
 cmd2<0.9
 PyYAML!=5.1
 polling==0.3.2
+retrying
 
 
 # For Queens: https://github.com/openstack/requirements/blob/stable/queens/global-requirements.txt