diff --git a/debian/python3-osm-mon.postinst b/debian/python3-osm-mon.postinst
index f41b674..ff08172 100644
--- a/debian/python3-osm-mon.postinst
+++ b/debian/python3-osm-mon.postinst
@@ -28,7 +28,7 @@
 pip3 install python-keystoneclient==3.15.*
 pip3 install six==1.11.*
 pip3 install peewee==3.8.*
-pip3 install pyyaml==3.*
+pip3 install pyyaml>=5.1.2
 pip3 install prometheus_client==0.4.*
 pip3 install gnocchiclient==7.0.*
 pip3 install pyvcloud==19.1.1