diff --git a/requirements.txt b/requirements.txt
index 122d52d..111a3cf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ com==1.0.0
 protobuf==3.4.0
 ipaddr==2.2.0
 java==0.0.1
-lxml==4.6.3
+lxml==4.9.1
 ndg_httpsclient==0.4.3
 netCDF4==1.3.0
 org==1.0.0