diff --git a/tox.ini b/tox.ini
index a578d0fa90..57b5aacfa8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -151,6 +151,6 @@ commands =
 allowlist_externals =
   {toxinidir}/tools/normalize_projects_yaml.py
 deps =
-  ruamel.yaml
+  ruamel.yaml!=0.18.13,!=0.18.14
 commands =
   {toxinidir}/tools/normalize_projects_yaml.py