diff --git a/requirements-dev.txt b/requirements-dev.txt
index 96e9f93..778d54e 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -7,7 +7,7 @@ pydocstyle==5.0.2
 virtualenv==16.7.9
 coverage==5.0.3
 sphinx==2.3.1
-lxml==4.5.0
+lxml==4.9.1
 sh==1.12.14
 gitchangelog==3.0.4
 bumpversion==0.5.3
diff --git a/requirements.txt b/requirements.txt
index f2bc1ad..959f017 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
 sh==1.12.14
-lxml==4.5.0
\ No newline at end of file
+lxml==4.9.1
\ No newline at end of file