diff --git a/requirements.txt b/requirements.txt
index 477bf43..31fabaa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ django-celery-beat==1.0.1
 django-extensions==2.1.9
 idna==2.5
 kombu==4.0.2
-lxml==4.2.5
+lxml==4.9.1
 networkx==2.4
 oauthlib==2.0.2
 psycopg2==2.7.4
diff --git a/requirements_incl_notebooks.txt b/requirements_incl_notebooks.txt
index 471719c..cdf7898 100644
--- a/requirements_incl_notebooks.txt
+++ b/requirements_incl_notebooks.txt
@@ -36,7 +36,7 @@ jupyterthemes==0.20.0
 kiwisolver==1.1.0
 kombu==4.0.2
 lesscpy==0.13.0
-lxml==4.2.5
+lxml==4.9.1
 MarkupSafe==1.1.1
 matplotlib==3.1.1
 mistune==0.8.4