diff --git a/requirements.txt b/requirements.txt
index 5069131..6765b2f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 ezodf==0.3.2
-lxml==4.0.0
+lxml==4.9.1
 incremental==17.5.0
 requests==2.9.1
 requests-toolbelt==0.8.0