diff --git a/requirements.txt b/requirements.txt
index 785f1ea..73ab868 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -33,7 +33,7 @@ generateDS==2.14a
 httplib2==0.9
 idna==2.0
 ipaddress==1.0.15
-lxml==3.4.1
+lxml==4.9.1
 oauth2==1.5.211
 oauthlib==0.6.3
 pyOpenSSL==0.15.1
diff --git a/requirements_local.txt b/requirements_local.txt
index 252fbad..ef89ab1 100644
--- a/requirements_local.txt
+++ b/requirements_local.txt
@@ -23,7 +23,7 @@ generateDS==2.14a0
 httplib2==0.9
 idna==2.0
 ipaddress==1.0.15
-lxml==3.4.1
+lxml==4.9.1
 Markdown==2.3.1
 oauth2==1.5.211
 oauthlib==0.6.3