diff --git a/ci/requirements.txt b/ci/requirements.txt
index 7904d0d..9c92220 100644
--- a/ci/requirements.txt
+++ b/ci/requirements.txt
@@ -1,4 +1,4 @@
 mercurial==4.1.3
 nose==1.3.7
-lxml==3.6.0
+lxml==4.6.5
 future==0.16.0