diff --git a/manifest-delivery-base.yml b/manifest-delivery-base.yml
index 2eaf380a6..4ba8a7550 100644
--- a/manifest-delivery-base.yml
+++ b/manifest-delivery-base.yml
@@ -24,7 +24,6 @@ applications:
 
   - name: notify-delivery-worker-database
     command: scripts/run_app_paas.sh celery -A aws_run_celery.notify_celery worker --loglevel=INFO --concurrency=11 -Q db-sms,db-email,db-letter,database-tasks
-    memory: 1G
     env:
       NOTIFY_APP_NAME: delivery-worker-database
 
@@ -35,7 +34,6 @@ applications:
 
   - name: notify-delivery-worker-sender
     command: scripts/run_app_paas.sh celery -A aws_run_celery.notify_celery worker --loglevel=INFO --concurrency=11 -Q send-sms,send-email,send-tasks
-    memory: 1G
     env:
       NOTIFY_APP_NAME: delivery-worker-sender
 
diff --git a/manifest-delivery-preview.yml b/manifest-delivery-preview.yml
index 2bbb3c0dc..492bc6c55 100644
--- a/manifest-delivery-preview.yml
+++ b/manifest-delivery-preview.yml
@@ -1,4 +1,4 @@
 ---
 
 inherit: manifest-delivery-base.yml
-memory: 256M
+memory: 1G
diff --git a/manifest-delivery-production.yml b/manifest-delivery-production.yml
index d2c2ba647..53c8d2f12 100644
--- a/manifest-delivery-production.yml
+++ b/manifest-delivery-production.yml
@@ -3,4 +3,4 @@
 inherit: manifest-delivery-base.yml
 
 instances: 2
-memory: 768M
+memory: 1G
diff --git a/manifest-delivery-staging.yml b/manifest-delivery-staging.yml
index d2c2ba647..53c8d2f12 100644
--- a/manifest-delivery-staging.yml
+++ b/manifest-delivery-staging.yml
@@ -3,4 +3,4 @@
 inherit: manifest-delivery-base.yml
 
 instances: 2
-memory: 768M
+memory: 1G