diff --git a/requirements.txt b/requirements.txt
index 07fd8d1..e07961f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,7 +22,7 @@ joblib==0.14.1
 jsonpatch==1.24
 jsonpointer==2.0
 kiwisolver==1.1.0
-lxml==4.4.1
+lxml==4.6.2
 matplotlib==2.2.4
 mkl-fft==1.0.14
 mkl-random==1.1.0