diff --git a/pyproject.toml b/pyproject.toml
index a37f9d8..82dec88 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ python = "^3.6"
 requests = "^2.0.0"
 six = "^1.0.0"
 python-dateutil = "^2.0.0"
-lxml = "^4.0.0"
+lxml = ">4.0.0"
 ifaddr = "^0.1.7"
 
 [tool.poetry.dev-dependencies]