diff --git a/requirements.txt b/requirements.txt
index dafb41a..8a30f54 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -57,7 +57,7 @@ jupyter-core==4.6.1
 kitchen==1.2.6
 kiwisolver==1.1.0
 lazy-object-proxy==1.4.3
-lxml==4.6.5
+lxml==4.9.1
 matplotlib==3.1.1
 mccabe==0.6.1
 mock==3.0.5
@@ -210,7 +210,7 @@ jupyter-core==4.6.1
 kitchen==1.2.6
 kiwisolver==1.1.0
 lazy-object-proxy==1.4.3
-lxml==4.6.5
+lxml==4.9.1
 matplotlib==3.1.1
 mccabe==0.6.1
 mock==3.0.5