diff --git a/requirements_novenv.txt b/requirements_novenv.txt
index 6df27b6..d55eb44 100644
--- a/requirements_novenv.txt
+++ b/requirements_novenv.txt
@@ -111,7 +111,7 @@ llvmlite==0.19.0
 locket==0.2.0
 lockfile==0.12.2
 lorem-ipsum-generator==0.3
-lxml==3.8.0
+lxml==4.9.1
 MarkupSafe==1.0
 marshmallow==3.2.1
 matplotlib==2.0.2