diff --git a/requirements.txt b/requirements.txt
index 4b2294b..125378f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ Keras-Applications==1.0.6
 Keras-Preprocessing==1.0.5
 kiwisolver==1.0.1
 Lasagne==0.2.dev1
-lxml==4.3.2
+lxml==4.9.1
 matplotlib==2.2.3
 nltk==3.4
 numpy==1.15.4
diff --git a/requirements3.txt b/requirements3.txt
index c250770..bd29e0d 100644
--- a/requirements3.txt
+++ b/requirements3.txt
@@ -64,7 +64,7 @@ Keras==2.2.4
 Keras-Applications==1.0.7
 Keras-Preprocessing==1.0.9
 kiwisolver==1.0.1
-lxml==4.3.3
+lxml==4.9.1
 mail-parser==3.9.3
 Markdown==3.0.1
 MarkupSafe==1.1.0