diff --git a/python_modules/dagster/setup.py b/python_modules/dagster/setup.py
index 69b6caae77c0..f75d9c966c32 100644
--- a/python_modules/dagster/setup.py
+++ b/python_modules/dagster/setup.py
@@ -61,7 +61,7 @@ def get_version() -> str:
             "click>=5.0",
             "coloredlogs>=6.1, <=14.0",
             "Jinja2",
-            "PyYAML",
+            "PyYAML>=5.1",
             # core (not explicitly expressed atm)
             "alembic>=1.2.1",
             "croniter>=0.3.34",