diff --git a/pyproject.toml b/pyproject.toml
index 5026ad2..1a35768 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,7 +9,7 @@ include = ["*/assets/*"]
 
 [tool.poetry.dependencies]
 python = "^3.8"
-lxml = "^5.3.0"
+lxml = ">=5.3.0,<7.0.0"
 
 [tool.poetry.extras]
 opencv-python = ["opencv-python-headless"]