diff --git a/rl_unplugged/requirements.txt b/rl_unplugged/requirements.txt
index cfe9965..abf4fcc 100644
--- a/rl_unplugged/requirements.txt
+++ b/rl_unplugged/requirements.txt
@@ -25,7 +25,7 @@ gym==0.17.2
 h5py==2.10.0
 idna==2.10
 Keras-Preprocessing==1.1.2
-lxml==4.5.1
+lxml==6.1.0
 Markdown==3.2.2
 numpy==1.19.0
 oauthlib==3.1.0