diff --git a/aitrainer_backoffice/aitrainer_backoffice/settings/dev.py b/aitrainer_backoffice/aitrainer_backoffice/settings/dev.py
index c5e4572..a2a720b 100644
--- a/aitrainer_backoffice/aitrainer_backoffice/settings/dev.py
+++ b/aitrainer_backoffice/aitrainer_backoffice/settings/dev.py
@@ -12,7 +12,7 @@ https://docs.djangoproject.com/en/3.0/ref/settings/
 
 import os
 
-BACKOFFICE_VERSION = 1.25
+BACKOFFICE_VERSION = 1.27
 
 # Build paths inside the project like this: os.path.join(BASE_DIR, ...)
 BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
@@ -51,7 +51,7 @@ INSTALLED_APPS = [
     'rangefilter',
     'adminsortable2',
     'inline_actions',
-    #'django_cron',
+    'django_cron',
 ]
 
 MIDDLEWARE = [
@@ -174,7 +174,7 @@ LOGGING = {
     },
 }
 
-#CRON_CLASSES = [
- #   'aitrainer_backoffice.controlling.cron.sync_customers',
+CRON_CLASSES = [
+    'aitrainer_backoffice.controlling.cron.sync_customers',
     # ...
-#]
\ No newline at end of file
+]
\ No newline at end of file
diff --git a/aitrainer_backoffice/aitrainer_backoffice/settings/prod.py b/aitrainer_backoffice/aitrainer_backoffice/settings/prod.py
index cc8ac59..9379de2 100644
--- a/aitrainer_backoffice/aitrainer_backoffice/settings/prod.py
+++ b/aitrainer_backoffice/aitrainer_backoffice/settings/prod.py
@@ -12,7 +12,7 @@ https://docs.djangoproject.com/en/3.0/ref/settings/
 
 import os
 
-BACKOFFICE_VERSION = 1.25
+BACKOFFICE_VERSION = 1.27
 
 # Build paths inside the project like this: os.path.join(BASE_DIR, ...)
 BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
@@ -28,7 +28,8 @@ SECRET_KEY = '9874959872==9847588jkklnkln$asdf' #os.environ['DJANGO_KEY']
 # SECURITY WARNING: don't run with debug turned on in production!
 DEBUG = True
 
-ALLOWED_HOSTS = ['62.171.188.119', 'localhost', 'andio.eu', 'aitrainer.info','aitrainer.app', 'admin.aitrainer.info', "admin.aitrainer.app"]
+ALLOWED_HOSTS = ['62.171.188.119', 'localhost', 'andio.eu', 'aitrainer.info','aitrainer.app', 'admin.aitrainer.info',
+                 "admin.aitrainer.app"]
 
 # Application definition
 
@@ -47,7 +48,7 @@ INSTALLED_APPS = [
     'rangefilter',
     'adminsortable2',
     'inline_actions',
-    #'django_cron',
+    'django_cron',
 ]
 
 MIDDLEWARE = [
@@ -185,7 +186,7 @@ CACHES = {
     }
 }
 
-#CRON_CLASSES = [
- #   'aitrainer_backoffice.aitrainer_backoffice.controlling.cron.sync_customers',
+CRON_CLASSES = [
+    'aitrainer_backoffice.aitrainer_backoffice.controlling.cron.sync_customers',
     # ...
-#]
+]
diff --git a/aitrainer_backoffice/controlling/cron/cron.py b/aitrainer_backoffice/controlling/cron/cron.py
index a0e913b..2086a35 100644
--- a/aitrainer_backoffice/controlling/cron/cron.py
+++ b/aitrainer_backoffice/controlling/cron/cron.py
@@ -5,7 +5,7 @@ import datetime
 
 class MyCronJob(CronJobBase):
     print(datetime.datetime.now(), " *** START sync customers ")
-    RUN_EVERY_MINS = 60 # every 2 hours
+    RUN_EVERY_MINS = 60
 
     schedule = Schedule(run_every_mins=RUN_EVERY_MINS)
     code = 'aitrainer_backoffice.controlling.cron'    # a unique code
diff --git a/requirements.txt b/requirements.txt
index 76a7ed3..f7f5df2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,6 +13,7 @@ mysqlclient==2.0.1
 requests==2.24.0
 pillow==7.2.0
 gunicorn==20.0.4
-adminsortable2==0.7.2
-inline_actions==2.4.0
-django-admin-rangefilter==0.8.1
\ No newline at end of file
+django-admin-sortable2==1.0
+django-inline_actions==2.4.0
+django-admin-rangefilter==0.8.1
+django-cron==0.5.1
\ No newline at end of file