diff --git a/requirements.txt b/requirements.txt
index 6b9ef9d67..d06b61228 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1,2 @@
-fonttools[ufo,lxml]==3.43.1
+lxml==4.3.5
+fonttools[ufo,lxml]==3.44.0