diff --git a/fairseq-semsim/semsim/requirements.txt b/fairseq-semsim/semsim/requirements.txt
index 7c30c2c..be8b8c7 100644
--- a/fairseq-semsim/semsim/requirements.txt
+++ b/fairseq-semsim/semsim/requirements.txt
@@ -17,7 +17,7 @@ idna==2.8
 jmespath==0.9.4
 joblib==0.13.2
 kiwisolver==1.1.0
-lxml==4.4.1
+lxml==4.6.3
 matplotlib==3.0.3
 murmurhash==1.0.2
 networkx==2.2