diff --git a/SAS/TMSS/src/CMakeLists.txt b/SAS/TMSS/src/CMakeLists.txt
index ec457abffce2e5d12a3b73ed7fdd88e4868343cd..ef07b2d5f722a17785c2c1da0ea8e8abe4c5f795 100644
--- a/SAS/TMSS/src/CMakeLists.txt
+++ b/SAS/TMSS/src/CMakeLists.txt
@@ -16,6 +16,7 @@ find_python_module(coreapi REQUIRED)            # sudo apt-get install python3-c
 find_python_module(django_jsonforms REQUIRED)   # pip3 install django-jsonforms
 find_python_module(django_json_widget REQUIRED) # pip3 install django-json-widget
 find_python_module(jsoneditor REQUIRED)         # pip3 install django-jsoneditor
+find_python_module(jsonschema REQUIRED)         # pip3 install jsonschema
 
 # modules for swagger API export
 find_python_module(drf_yasg REQUIRED)           # pip install drf-yasg
diff --git a/SAS/TMSS/src/tmss/tmssapp/models/scheduling.py b/SAS/TMSS/src/tmss/tmssapp/models/scheduling.py
index a693066284a7b1561b8dc7b63c4901f6a0f7af6a..7693d05da21a9033ddefb55cbdeda5278fede3e4 100644
--- a/SAS/TMSS/src/tmss/tmssapp/models/scheduling.py
+++ b/SAS/TMSS/src/tmss/tmssapp/models/scheduling.py
@@ -12,7 +12,6 @@ from rest_framework.serializers import HyperlinkedRelatedField
 from lofar.sas.tmss.tmss.exceptions import *
 
 import json
-import fastjsonschema
 import jsonschema
 
 #
diff --git a/SubSystems/RAServices/Dockerfile b/SubSystems/RAServices/Dockerfile
index bdca521f98783ed8d5d9f690bf140eca492615e1..3b09b0deab2f904ee783938f8c29b3adf8eb4216 100644
--- a/SubSystems/RAServices/Dockerfile
+++ b/SubSystems/RAServices/Dockerfile
@@ -10,7 +10,7 @@ RUN yum install -y https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x
 RUN yum install -y postgresql96 postgresql96-server postgresql96-devel
 ENV PATH /usr/pgsql-9.6/bin:$PATH
 
-RUN pip3 install cython kombu lxml requests pygcn xmljson mysql-connector-python python-dateutil django djangorestframework djangorestframework-xml ldap==1.0.2 flask fabric coverage python-qpid-proton PyGreSQL numpy h5py psycopg2 testing.postgresql Flask-Testing scipy Markdown django-filter python-ldap python-ldap-test ldap3 djangorestframework django-jsonforms django-json-widget django-jsoneditor drf-yasg flex swagger-spec-validator django-auth-ldap mozilla-django-oidc
+RUN pip3 install cython kombu lxml requests pygcn xmljson mysql-connector-python python-dateutil django djangorestframework djangorestframework-xml ldap==1.0.2 flask fabric coverage python-qpid-proton PyGreSQL numpy h5py psycopg2 testing.postgresql Flask-Testing scipy Markdown django-filter python-ldap python-ldap-test ldap3 djangorestframework django-jsonforms django-json-widget django-jsoneditor drf-yasg flex swagger-spec-validator django-auth-ldap mozilla-django-oidc jsonschema
 RUN adduser lofarsys
 USER lofarsys