diff --git a/r.txt b/r.txt
index 679b685..e0661e0 100644
--- a/r.txt
+++ b/r.txt
@@ -45,7 +45,7 @@ isort==4.2.5
 itsdangerous==0.24
 Jinja2==2.7.1
 lazy-object-proxy==1.2.2
-lxml==4.2.5
+lxml==4.9.1
 Mako==0.8.1
 Markdown==2.5.2
 MarkupSafe==0.23
diff --git a/requirements.txt b/requirements.txt
index aa297a7..baf9c12 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -70,7 +70,7 @@ itsdangerous==0.24
 jdcal==1.4.1
 jmespath==0.9.3
 lml==0.0.9
-lxml==4.2.5
+lxml==4.9.1
 mem-top==0.1.7
 memory-profiler==0.43
 nose==1.3.0