diff --git a/requirements.txt b/requirements.txt
index 82083ff69..d7031e411 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,7 @@
 wxPython == 4.0.6
 logbook >= 1.0.0
 matplotlib == 3.0.3
+numpy==1.16.4
 python-dateutil
 requests >= 2.0.0
 sqlalchemy >= 1.3.0