diff --git a/setup.py b/setup.py
index cd785cc..9a2263e 100644
--- a/setup.py
+++ b/setup.py
@@ -12,6 +12,7 @@
         "requests>=2.22,<3",
         "requests_cache>=1.1",
         "ruamel.yaml<=0.17.21",
+        "ruamel.yaml.clib<=0.2.7",
         "pyparsing<3.2",
         "progress_bar",
         "openpyxl",