diff --git a/mirror/dependencies/pnda_requirements_py2.txt b/mirror/dependencies/pnda_requirements_py2.txt
index 19c18c5c..b5c79d33 100644
--- a/mirror/dependencies/pnda_requirements_py2.txt
+++ b/mirror/dependencies/pnda_requirements_py2.txt
@@ -52,7 +52,7 @@ jsonschema==2.5.1
 kafka-python==1.3.5
 kazoo==2.2.1
 keystoneauth1==2.16.0
-lxml==3.6.4
+lxml==4.6.5
 mock==2.0.0
 monotonic==1.2
 msgpack-python==0.4.8
diff --git a/mirror/dependencies/pnda_requirements_py3.txt b/mirror/dependencies/pnda_requirements_py3.txt
index e41773f4..1a9281fd 100644
--- a/mirror/dependencies/pnda_requirements_py3.txt
+++ b/mirror/dependencies/pnda_requirements_py3.txt
@@ -21,7 +21,7 @@ jupyter-console==5.0.0
 jupyter-core==4.2.1
 jupyter==1.0.0
 jupyterhub==0.7.0
-lxml==3.6.4
+lxml==4.6.5
 Mako==1.0.6
 MarkupSafe==0.23
 mistune==0.7.3