diff --git a/allianceauth/services/tasks.py b/allianceauth/services/tasks.py
index 9803a4d1..6db9d6e8 100644
--- a/allianceauth/services/tasks.py
+++ b/allianceauth/services/tasks.py
@@ -4,8 +4,8 @@ from celery import shared_task
 from django.contrib.auth.models import User
 from .hooks import ServicesHook
 from celery_once import QueueOnce as BaseTask, AlreadyQueued
-from celery_once.helpers import now_unix
 from django.core.cache import cache
+from time import time
 
 
 logger = logging.getLogger(__name__)
@@ -22,7 +22,7 @@ class DjangoBackend:
 
     @staticmethod
     def raise_or_lock(key, timeout):
-        now = now_unix()
+        now = int(time())
         result = cache.get(key)
         if result:
             remaining = int(result) - now
diff --git a/setup.py b/setup.py
index 9d9bd219..6c68d71b 100644
--- a/setup.py
+++ b/setup.py
@@ -13,20 +13,21 @@ install_requires = [
     'semantic_version',
 
     'redis<=2.10.6',
-    'celery>=4.0.2',
+    'celery>=4.0.2,<4.3.0',
     'celery_once',
 
     'django>=2.0',
     'django-bootstrap-form',
     'django-registration==2.4',
     'django-sortedm2m',
-    'django-redis-cache>=1.7.1',
+    'django-redis-cache==1.8.1',
     'django-celery-beat<=1.1.1',
 
     'openfire-restapi',
     'sleekxmpp',
 
     'adarnauth-esi>=1.4.10,<2.0',
+    'kombu<=4.3.0',
 ]
 
 testing_extras = [