diff --git a/requirements_provisional.txt b/requirements_provisional.txt
index 38d32a0..1e7c80c 100644
--- a/requirements_provisional.txt
+++ b/requirements_provisional.txt
@@ -5,7 +5,7 @@ future==0.18.2
 kaldi-io==0.9.4
 kiwisolver==1.2.0
 llvmlite==0.33.0
-lxml==4.6.2
+lxml==4.9.1
 lmdb==0.99
 matplotlib==3.3.0
 numba==0.50.1