diff --git a/dev-requirements.txt b/dev-requirements.txt
index 75e2c7d..47892d7 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -6,7 +6,7 @@ Sphinx==1.8.1
 pook==0.2.5
 PyJWT==1.6.4
 cryptography==2.3.1
-lxml==4.2.5
+lxml==4.9.1
 xmlsec==1.3.3
 python3-saml==1.4.1
 
diff --git a/requirements.txt b/requirements.txt
index 9309cd7..0fcd036 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ idna==2.5
 requests==2.21.0
 PyJWT==1.6.4
 cryptography==2.3.1
-lxml==4.2.5
+lxml==4.9.1
 xmlsec==1.3.3
 python3-saml==1.4.1
 miracle-acl==0.0.4-1