diff --git a/ippisite/requirements-dev.txt b/ippisite/requirements-dev.txt
index c8aa1e20adb53df4bf0f96e67253ded5ce33ce92..97dd855af13d72b6515326e85d1810aa63fe3c4c 100644
--- a/ippisite/requirements-dev.txt
+++ b/ippisite/requirements-dev.txt
@@ -15,3 +15,4 @@ parameterized
 pygraphviz
 pydot
 pyparsing
+pyyaml>=5.1
\ No newline at end of file