diff --git a/pyproject.toml b/pyproject.toml
index 38539e8..fb1f78e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,7 @@ azure-mgmt-resource = "^24.0.0"
 azure-mgmt-resourcegraph = "^8.0.0"
 azure-core = "^1.31.0"
 tabulate = "^0.9.0"
+six = "^1.16.0"
 
 
 [build-system]