diff --git a/install/notebook/requirements.txt b/install/notebook/requirements.txt
index 7725c889..eede2d48 100644
--- a/install/notebook/requirements.txt
+++ b/install/notebook/requirements.txt
@@ -22,7 +22,7 @@ psycopg2==2.6.2
 pycountry==1.20
 python-dateutil==2.4.2
 pytz==2016.10                   # timezones
-PyYAML==3.11
+PyYAML==5.4
 RandomWords==0.1.12
 ujson==1.35
 umalqurra==0.2                 # arabic calendars (?? why use ??)