diff --git a/requirements.txt b/requirements.txt
index c01ade299..5729afcea 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1 @@
-# Nothing
+ruamel.yaml<0.18.0
diff --git a/tox.ini b/tox.ini
index afe35bdd9..37539c1d7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -148,7 +148,6 @@ basepython = python3
 sitepackages = False
 
 deps = {[testenv]deps}
-       ruamel.yaml
        requests
        pylint<2.5.0
 commands =