diff --git a/CPU_Mac_Requirements.txt b/CPU_Mac_Requirements.txt
index 2b3f3d1..faf6217 100644
--- a/CPU_Mac_Requirements.txt
+++ b/CPU_Mac_Requirements.txt
@@ -47,7 +47,7 @@ liblapack==3.8.0
 libpng==1.6.37
 libsodium==1.0.16
 llvm-openmp==8.0.0
-lxml==4.6.5
+lxml==4.9.1
 markdown==3.1.1
 markupsafe==1.1.1
 matplotlib==3.1.0