diff --git a/gunicorn_config.py b/gunicorn_config.py
index d22c829dac..2818b62c1d 100644
--- a/gunicorn_config.py
+++ b/gunicorn_config.py
@@ -1,6 +1,6 @@
 import os
 
-from notifications_utils.gunicorn_defaults import set_gunicorn_defaults
+from notifications_utils.gunicorn.defaults import set_gunicorn_defaults
 
 set_gunicorn_defaults(globals())
 
@@ -16,10 +16,12 @@ def child_exit(server, worker):
 
 
 workers = 4
-worker_class = "eventlet"
-worker_connections = 8  # limit runaway greenthread creation
+worker_class = "notifications_utils.gunicorn.eventlet.NotifyEventletWorker"
+#worker_connections = 8  # limit runaway greenthread creation
+worker_connections = 256  # re-enabling the problem 
 statsd_host = "{}:8125".format(os.getenv("STATSD_HOST"))
-keepalive = 0  # disable temporarily for diagnosing issues
+keepalive = 35 # re-enabling the problem
+#keepalive = 0  # disable temporarily for diagnosing issues
 timeout = int(os.getenv("HTTP_SERVE_TIMEOUT_SECONDS", 30))  # though has little effect with eventlet worker_class
 
 debug_post_threshold = os.getenv("NOTIFY_GUNICORN_DEBUG_POST_REQUEST_LOG_THRESHOLD_SECONDS", None)
diff --git a/requirements.in b/requirements.in
index 16c91b8743..9d54a9be58 100644
--- a/requirements.in
+++ b/requirements.in
@@ -25,7 +25,7 @@ psutil>=6.0.0,<7.0.0
 notifications-python-client==10.0.1
 
 # Run `make bump-utils` to update to the latest version
-notifications-utils @ git+https://github.com/alphagov/notifications-utils.git@94.0.1
+notifications-utils @ git+https://github.com/alphagov/notifications-utils.git@2d56aef11c9d34acf15176a1b2b20cc874b4deec
 
 # gds-metrics requires prometheseus 0.2.0, override that requirement as 0.7.1 brings significant performance gains
 prometheus-client==0.14.1
diff --git a/requirements.txt b/requirements.txt
index 1227758274..b146015d18 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -95,7 +95,9 @@ gds-metrics @ git+https://github.com/alphagov/gds_metrics_python.git@6f1840a57b6
 govuk-bank-holidays==0.15
     # via notifications-utils
 greenlet==3.0.3
-    # via eventlet
+    # via
+    #   eventlet
+    #   sqlalchemy
 gunicorn @ git+https://github.com/benoitc/gunicorn.git@1299ea9e967a61ae2edebe191082fd169b864c64
     # via
     #   -r requirements.in
@@ -147,7 +149,7 @@ mistune==0.8.4
     # via notifications-utils
 notifications-python-client==10.0.1
     # via -r requirements.in
-notifications-utils @ git+https://github.com/alphagov/notifications-utils.git@d6311c3ab83b8225265277f781157c48f9318ae9
+notifications-utils @ git+https://github.com/alphagov/notifications-utils.git@2d56aef11c9d34acf15176a1b2b20cc874b4deec
     # via -r requirements.in
 ordered-set==4.1.0
     # via notifications-utils
diff --git a/requirements_for_test.txt b/requirements_for_test.txt
index 6eed37af49..6c4742eb05 100644
--- a/requirements_for_test.txt
+++ b/requirements_for_test.txt
@@ -151,6 +151,7 @@ greenlet==3.0.3
     # via
     #   -r requirements.txt
     #   eventlet
+    #   sqlalchemy
 gunicorn @ git+https://github.com/benoitc/gunicorn.git@1299ea9e967a61ae2edebe191082fd169b864c64
     # via
     #   -r requirements.txt
@@ -219,7 +220,7 @@ moto==5.0.11
     # via -r requirements_for_test.in
 notifications-python-client==10.0.1
     # via -r requirements.txt
-notifications-utils @ git+https://github.com/alphagov/notifications-utils.git@d6311c3ab83b8225265277f781157c48f9318ae9
+notifications-utils @ git+https://github.com/alphagov/notifications-utils.git@2d56aef11c9d34acf15176a1b2b20cc874b4deec
     # via -r requirements.txt
 ordered-set==4.1.0
     # via