diff --git a/requirements.txt b/requirements.txt
index 7bb53ac..61499dc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ click
 jinja2
 lxml
 uniseg
-numpy
+numpy<1.19.0
 colorama
 MarkupSafe
 ocrd >= 2.20.1