diff --git a/requirements-python37-rf31.txt b/requirements-python37-rf31.txt
index 308c3ed..3a1b92e 100644
--- a/requirements-python37-rf31.txt
+++ b/requirements-python37-rf31.txt
@@ -57,7 +57,7 @@ jupytext==1.4.2
 kitchen==1.2.6
 lazy-object-proxy==1.4.3
 lunr==0.5.8
-lxml==4.6.2
+lxml==4.9.1
 mccabe==0.6.1
 mistune==0.8.4
 more-itertools==8.2.0
diff --git a/requirements-python37-rf32.txt b/requirements-python37-rf32.txt
index a45b175..5b36a82 100644
--- a/requirements-python37-rf32.txt
+++ b/requirements-python37-rf32.txt
@@ -57,7 +57,7 @@ jupytext==1.4.2
 kitchen==1.2.6
 lazy-object-proxy==1.4.3
 lunr==0.5.8
-lxml==4.6.2
+lxml==4.9.1
 mccabe==0.6.1
 mistune==0.8.4
 more-itertools==8.2.0