diff --git a/requirements.txt b/requirements.txt
index 0d2b31f..27d98b8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 keras
-lxml==4.9
+lxml==4.9.1
 mordred==1.2
 numpy
 pandas
diff --git a/setup.cfg b/setup.cfg
index 81ae500..7ee3171 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -3,7 +3,7 @@ python_requires = >= 3.7, <3.10
 install_requires =
     keras
     python-libsbml
-    lxml==4.9
+    lxml==4.9.1
     mordred==1.2
     pandas
     pymongo