diff --git a/requirements.txt b/requirements.txt
index a9f7072..df8660a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ cycler==0.10.0
 idna==2.7
 inflection==0.3.1
 kiwisolver==1.0.1
-lxml==4.2.2
+lxml==4.6.5
 matplotlib==2.2.2
 mkl-fft==1.0.0
 mkl-random==1.0.1