diff --git a/install/requirements.txt b/install/requirements.txt
index 6e072b6..e6e9793 100644
--- a/install/requirements.txt
+++ b/install/requirements.txt
@@ -1,49 +1,52 @@
-anyjson==0.3.3
-click
-DateTime==4.2
-Django==2.0.5
-django-admin-tools==0.8.1
-django-bootstrap3==10.0.1
-django-extensions==2.0.7
-
-# for Choices
-django-model-utils
-
-django-suit==0.2.26
-django-test-without-migrations==0.6
-#gunicorn==19.8.1
-iso8601==0.1.12
-jdcal==1.4
-lxml==4.3.0
-mysqlclient==1.3.12
-#pluggy>=0.7
-pluggy==0.8.1
-py==1.5.3
-pytz==2018.4
-requests==2.18.4
-six==1.11.0
-sqlparse==0.2.4
-Twisted==18.4.0
-voevent-parse==1.0.3
-zope.interface==5.2.0
-
-# For DEV
-django-debug-toolbar==1.9.1
-
-# Modifications 2021 :
-# removing plantuml because we need a unofficial version (maybe we could force to go back on an old version where the bug wasn't happening
-# added httplib2 which is needed for plantuml
-# added dataclasses which was missing for the model controller script
-#plantuml
-httplib2
-dataclasses
-pykwalify
-PyYAML
-# For Celery:
-##celery==3.1.23
-##flower==0.9.2
-##amqp==1.4.9
-##amqplib==1.0.2
-##billiard==3.3.0.23
-##kombu==3.0.37
-##django-celery==3.1.17
+anyjson==0.3.3
+click
+DateTime==4.2
+Django==2.0.5
+django-admin-tools==0.8.1
+django-bootstrap3==10.0.1
+django-extensions==2.0.7
+
+# for Choices
+django-model-utils
+
+django-suit==0.2.26
+django-test-without-migrations==0.6
+#gunicorn==19.8.1
+iso8601==0.1.12
+jdcal==1.4
+lxml==4.3.0
+mysqlclient==1.3.12
+#pluggy>=0.7
+pluggy==0.8.1
+py==1.5.3
+pytz==2018.4
+requests==2.18.4
+six==1.11.0
+sqlparse==0.2.4
+Twisted==18.4.0
+voevent-parse==1.0.3
+zope.interface==5.2.0
+
+# For DEV
+django-debug-toolbar==1.9.1
+
+# Modifications 2021 :
+# removing plantuml because we need a unofficial version (maybe we could force to go back on an old version where the bug wasn't happening
+# added httplib2 which is needed for plantuml
+# added dataclasses which was missing for the model controller script
+#plantuml
+httplib2
+dataclasses
+pykwalify
+PyYAML
+# For Celery:
+##celery==3.1.23
+##flower==0.9.2
+##amqp==1.4.9
+##amqplib==1.0.2
+##billiard==3.3.0.23
+##kombu==3.0.37
+##django-celery==3.1.17
+
+# For working with date
+python-dateutil
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