diff --git a/molecule-requirements.txt b/molecule-requirements.txt
index 3f3b2f524..5bfda0211 100644
--- a/molecule-requirements.txt
+++ b/molecule-requirements.txt
@@ -18,3 +18,5 @@ openstackdocstheme>=1.29.2 # Apache-2.0
 reno>=2.11.3 # Apache-2.0
 doc8>=0.8.0 # Apache-2.0
 bashate>=0.6.0 # Apache-2.0
+
+tenacity>=4.4.0 # Apache-2.0