diff --git a/debian/python3-osm-nbi.postinst b/debian/python3-osm-nbi.postinst
index c2400c6..54dadb1 100755
--- a/debian/python3-osm-nbi.postinst
+++ b/debian/python3-osm-nbi.postinst
@@ -23,6 +23,7 @@
 python3 -m pip install -U pip
 python3 -m pip install cherrypy==18.1.2
 python3 -m pip install keystoneauth1
+python3 -m pip install jsonschema==3.2.0
 
 #Creation of log folder
 mkdir -p /var/log/osm