diff --git a/molecule-requirements.txt b/molecule-requirements.txt
index 8c8d176c6..dfecfddb0 100644
--- a/molecule-requirements.txt
+++ b/molecule-requirements.txt
@@ -1,6 +1,8 @@
 # this is required for the molecule jobs
 ansi2html
 docker
+# https://github.com/sqlalchemy/dogpile.cache/issues/178 (openstacksdk)
+dogpile.cache>=0.6.5,<0.9.1  # MIT
 openstacksdk
 pytest
 pytest-cov