diff --git a/requirements.txt b/requirements.txt
index 0e7c13ca2f..d061dc0397 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -38,7 +38,7 @@ jsonschema-to-openapi==0.2.1
 responses==0.13.3
 numba==0.53.1
 pyvo==1.1
-lxml==4.6.3
+lxml==4.9.2
 suds-py3==1.4.4.1
 vcrpy==4.1.1
 aiosmtpd==1.4.2