diff --git a/src/ifcopenshell-python/ifcopenshell/requirements.txt b/src/ifcopenshell-python/ifcopenshell/requirements.txt
index 232aae9415..5c5a6cb50e 100644
--- a/src/ifcopenshell-python/ifcopenshell/requirements.txt
+++ b/src/ifcopenshell-python/ifcopenshell/requirements.txt
@@ -1,4 +1,4 @@
-lxml==4.6.3
+lxml==4.6.5
 numpy==1.20.3
 regex==2021.4.4
 xmlschema==1.6.4
\ No newline at end of file