diff --git a/un_collections/requirements.txt b/un_collections/requirements.txt
index 69e19b6..fee9fe3 100644
--- a/un_collections/requirements.txt
+++ b/un_collections/requirements.txt
@@ -28,7 +28,7 @@ jupyter==1.0.0
 jupyter-client==5.1.0
 jupyter-console==5.2.0
 jupyter-core==4.3.0
-lxml==4.1.0
+lxml==4.9.1
 MarkupSafe==1.0
 mistune==0.8
 nbconvert==5.3.1
diff --git a/un_collections/unido/requirements.txt b/un_collections/unido/requirements.txt
index d494a55..46be2fd 100644
--- a/un_collections/unido/requirements.txt
+++ b/un_collections/unido/requirements.txt
@@ -124,7 +124,7 @@ lazy-object-proxy==1.2.2
 llvmlite==0.18.0
 locket==0.2.0
 locustio==0.8.1
-lxml==3.7.3
+lxml==4.9.1
 MarkupSafe==0.23
 matplotlib==2.0.2
 mccabe==0.6.1