diff --git a/pandas-ta-quant/dev-requirements.frozen.txt b/pandas-ta-quant/dev-requirements.frozen.txt
index 9b954964..a69717da 100644
--- a/pandas-ta-quant/dev-requirements.frozen.txt
+++ b/pandas-ta-quant/dev-requirements.frozen.txt
@@ -1,6 +1,6 @@
 ipykernel==6.3.1
 jupyter-client==7.0.2
-lxml==4.6.3
+lxml==4.9.1
 Markdown==3.3.4
 matplotlib==3.4.3
 nbconvert==6.1.0