diff --git a/requirements.txt b/requirements.txt
index 3ff995a..1ee83ee 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,4 +10,4 @@
 beautifulsoup4 >=4.9.0,<5
 fast_diff_match_patch >=2.0.1,<3
 html5-parser >=0.4.0,<0.5 --no-binary lxml
-lxml >=4.5.0,<6
+lxml >=4.5.0,<7