diff --git a/pyproject.toml b/pyproject.toml
index 8c684a7f..0e0014b8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,6 +23,7 @@ returns = "^0.26.0"
 eth-typing = "<5"
 py-vollib = "^1.0.1"
 msgspec = "^0.19.0"
+pyyaml = ">=6.0.1"
 
 
 [tool.poetry.scripts]