diff --git a/source/downloads/code/requirements.txt b/source/downloads/code/requirements.txt
index 293e0d1..d2437a2 100644
--- a/source/downloads/code/requirements.txt
+++ b/source/downloads/code/requirements.txt
@@ -2,7 +2,7 @@ Cython==0.16
 distribute==0.6.28
 epydoc==3.0.1
 ipython==0.13
-lxml==2.3.5
+lxml==4.9.1
 patsy==0.1.0
 python-dateutil==1.5
 pytz==2012d