diff --git a/src/ifcopenshell-python/ifcopenshell/requirements.txt b/src/ifcopenshell-python/ifcopenshell/requirements.txt
index 61483c9779..0c8137eb43 100644
--- a/src/ifcopenshell-python/ifcopenshell/requirements.txt
+++ b/src/ifcopenshell-python/ifcopenshell/requirements.txt
@@ -1,4 +1,4 @@
-lxml==4.9.1
+lxml==6.1.0
 numpy==1.22.0
 regex==2021.4.4
 xmlschema==1.6.4
\ No newline at end of file