diff --git a/setup.py b/setup.py
index 0e69701bf..b6dfc61fd 100644
--- a/setup.py
+++ b/setup.py
@@ -57,7 +57,7 @@ install_requires = [
     "treelib>=1.5.5",
     "inflect>=2.1.0",
     "humanize>=0.5.1",
-    "ruamel.yaml>=0.15.91",
+    "ruamel.yaml>=0.15.91,<0.16",
     "funcy>=1.12",
     "pathspec>=0.5.9",
     "shortuuid>=0.5.0",