diff --git a/semantic-text-similarity/requirements.txt b/semantic-text-similarity/requirements.txt
index 64f36c7..188078c 100644
--- a/semantic-text-similarity/requirements.txt
+++ b/semantic-text-similarity/requirements.txt
@@ -109,7 +109,7 @@ libarchive-c==2.8
 lief==0.9.0
 llvmlite==0.26.0
 locket==0.2.0
-lxml==4.2.4
+lxml==4.6.2
 Markdown==3.2.1
 MarkupSafe==1.1.0
 matplotlib==3.0.2