diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -130,7 +130,7 @@
         "Flask-WTF==0.12",
         "typing",
         "click==6.7",
-        "pyyaml==3.13",
+        "pyyaml==5.1.2",
         "requests",
         "future",
         "lit==0.11.1",