diff --git a/requirements/processing.txt b/requirements/processing.txt
index 94625d4..9171ed3 100644
--- a/requirements/processing.txt
+++ b/requirements/processing.txt
@@ -5,4 +5,4 @@ pypandoc==1.4
 # Processing
 # -------------------------
 cssselect==1.0.3
-lxml==4.6.2
+lxml==4.9.1
diff --git a/requirements/prod.txt b/requirements/prod.txt
index 80464d4..6bb16d7 100644
--- a/requirements/prod.txt
+++ b/requirements/prod.txt
@@ -7,4 +7,4 @@ gunicorn==19.9.0
 
 # Processing (only for heroku tests)
 cssselect==1.0.3
-lxml==4.6.2
+lxml==4.9.1
diff --git a/setup.py b/setup.py
index 71b884e..e64860e 100644
--- a/setup.py
+++ b/setup.py
@@ -91,7 +91,7 @@ def find_version(*file_paths):
 
         # Processing
         'cssselect==1.0.0',
-        'lxml==4.6.2',
+        'lxml==4.9.1',
 
         # Production
         'gunicorn==19.9.0',