diff --git a/backend-project/requirements/development.txt b/backend-project/requirements/development.txt
index d368d52e2..ee90057e8 100644
--- a/backend-project/requirements/development.txt
+++ b/backend-project/requirements/development.txt
@@ -2,7 +2,7 @@
 coveralls==2.1.2
 django-debug-toolbar==3.2.1
 factory-boy==3.1.0
-lxml==4.6.3
+lxml==4.9.1
 parameterized==0.7.4
 django-test-plus==1.4.0
 tblib==1.6.0 # support stack trace in parallel test