diff --git a/backend/onyx/background/celery/apps/app_base.py b/backend/onyx/background/celery/apps/app_base.py
index 3f0d50950..9b320aae4 100644
--- a/backend/onyx/background/celery/apps/app_base.py
+++ b/backend/onyx/background/celery/apps/app_base.py
@@ -161,7 +161,7 @@ def on_task_postrun(
         return
 
 
-def on_celeryd_init(sender: Any = None, conf: Any = None, **kwargs: Any) -> None:
+def on_celeryd_init(sender: str, conf: Any = None, **kwargs: Any) -> None:
     """The first signal sent on celery worker startup"""
 
     # NOTE(rkuo): start method "fork" is unsafe and we really need it to be "spawn"
diff --git a/backend/onyx/background/celery/apps/heavy.py b/backend/onyx/background/celery/apps/heavy.py
index 7216e858d..4854940fd 100644
--- a/backend/onyx/background/celery/apps/heavy.py
+++ b/backend/onyx/background/celery/apps/heavy.py
@@ -3,6 +3,7 @@ from typing import Any
 from celery import Celery
 from celery import signals
 from celery import Task
+from celery.apps.worker import Worker
 from celery.signals import celeryd_init
 from celery.signals import worker_init
 from celery.signals import worker_ready
@@ -48,16 +49,16 @@ def on_task_postrun(
 
 
 @celeryd_init.connect
-def on_celeryd_init(sender: Any = None, conf: Any = None, **kwargs: Any) -> None:
+def on_celeryd_init(sender: str, conf: Any = None, **kwargs: Any) -> None:
     app_base.on_celeryd_init(sender, conf, **kwargs)
 
 
 @worker_init.connect
-def on_worker_init(sender: Any, **kwargs: Any) -> None:
+def on_worker_init(sender: Worker, **kwargs: Any) -> None:
     logger.info("worker_init signal received.")
 
     SqlEngine.set_app_name(POSTGRES_CELERY_WORKER_HEAVY_APP_NAME)
-    SqlEngine.init_engine(pool_size=4, max_overflow=12)
+    SqlEngine.init_engine(pool_size=sender.concurrency, max_overflow=8)  # type: ignore
 
     app_base.wait_for_redis(sender, **kwargs)
     app_base.wait_for_db(sender, **kwargs)
diff --git a/backend/onyx/background/celery/apps/indexing.py b/backend/onyx/background/celery/apps/indexing.py
index 0c116984f..89681ea74 100644
--- a/backend/onyx/background/celery/apps/indexing.py
+++ b/backend/onyx/background/celery/apps/indexing.py
@@ -3,6 +3,7 @@ from typing import Any
 from celery import Celery
 from celery import signals
 from celery import Task
+from celery.apps.worker import Worker
 from celery.signals import celeryd_init
 from celery.signals import worker_init
 from celery.signals import worker_process_init
@@ -49,19 +50,19 @@ def on_task_postrun(
 
 
 @celeryd_init.connect
-def on_celeryd_init(sender: Any = None, conf: Any = None, **kwargs: Any) -> None:
+def on_celeryd_init(sender: str, conf: Any = None, **kwargs: Any) -> None:
     app_base.on_celeryd_init(sender, conf, **kwargs)
 
 
 @worker_init.connect
-def on_worker_init(sender: Any, **kwargs: Any) -> None:
+def on_worker_init(sender: Worker, **kwargs: Any) -> None:
     logger.info("worker_init signal received.")
 
     SqlEngine.set_app_name(POSTGRES_CELERY_WORKER_INDEXING_APP_NAME)
 
     # rkuo: been seeing transient connection exceptions here, so upping the connection count
     # from just concurrency/concurrency to concurrency/concurrency*2
-    SqlEngine.init_engine(pool_size=sender.concurrency, max_overflow=8)
+    SqlEngine.init_engine(pool_size=sender.concurrency, max_overflow=8)  # type: ignore
 
     app_base.wait_for_redis(sender, **kwargs)
     app_base.wait_for_db(sender, **kwargs)
diff --git a/backend/onyx/background/celery/apps/light.py b/backend/onyx/background/celery/apps/light.py
index 695bda69c..abc2cfab1 100644
--- a/backend/onyx/background/celery/apps/light.py
+++ b/backend/onyx/background/celery/apps/light.py
@@ -3,6 +3,7 @@ from typing import Any
 from celery import Celery
 from celery import signals
 from celery import Task
+from celery.apps.worker import Worker
 from celery.signals import celeryd_init
 from celery.signals import worker_init
 from celery.signals import worker_ready
@@ -14,7 +15,6 @@ from onyx.db.engine import SqlEngine
 from onyx.utils.logger import setup_logger
 from shared_configs.configs import MULTI_TENANT
 
-
 logger = setup_logger()
 
 celery_app = Celery(__name__)
@@ -48,18 +48,18 @@ def on_task_postrun(
 
 
 @celeryd_init.connect
-def on_celeryd_init(sender: Any = None, conf: Any = None, **kwargs: Any) -> None:
+def on_celeryd_init(sender: str, conf: Any = None, **kwargs: Any) -> None:
     app_base.on_celeryd_init(sender, conf, **kwargs)
 
 
 @worker_init.connect
-def on_worker_init(sender: Any, **kwargs: Any) -> None:
+def on_worker_init(sender: Worker, **kwargs: Any) -> None:
     logger.info("worker_init signal received.")
 
-    logger.info(f"Concurrency: {sender.concurrency}")
+    logger.info(f"Concurrency: {sender.concurrency}")  # type: ignore
 
     SqlEngine.set_app_name(POSTGRES_CELERY_WORKER_LIGHT_APP_NAME)
-    SqlEngine.init_engine(pool_size=sender.concurrency, max_overflow=8)
+    SqlEngine.init_engine(pool_size=sender.concurrency, max_overflow=8)  # type: ignore
 
     app_base.wait_for_redis(sender, **kwargs)
     app_base.wait_for_db(sender, **kwargs)
diff --git a/backend/onyx/background/celery/apps/primary.py b/backend/onyx/background/celery/apps/primary.py
index b4f9868ac..8056e3d5e 100644
--- a/backend/onyx/background/celery/apps/primary.py
+++ b/backend/onyx/background/celery/apps/primary.py
@@ -6,6 +6,7 @@ from celery import bootsteps  # type: ignore
 from celery import Celery
 from celery import signals
 from celery import Task
+from celery.apps.worker import Worker
 from celery.exceptions import WorkerShutdown
 from celery.signals import celeryd_init
 from celery.signals import worker_init
@@ -72,12 +73,12 @@ def on_task_postrun(
 
 
 @celeryd_init.connect
-def on_celeryd_init(sender: Any = None, conf: Any = None, **kwargs: Any) -> None:
+def on_celeryd_init(sender: str, conf: Any = None, **kwargs: Any) -> None:
     app_base.on_celeryd_init(sender, conf, **kwargs)
 
 
 @worker_init.connect
-def on_worker_init(sender: Any, **kwargs: Any) -> None:
+def on_worker_init(sender: Worker, **kwargs: Any) -> None:
     logger.info("worker_init signal received.")
 
     SqlEngine.set_app_name(POSTGRES_CELERY_WORKER_PRIMARY_APP_NAME)
@@ -133,7 +134,7 @@ def on_worker_init(sender: Any, **kwargs: Any) -> None:
         raise WorkerShutdown("Primary worker lock could not be acquired!")
 
     # tacking on our own user data to the sender
-    sender.primary_worker_lock = lock
+    sender.primary_worker_lock = lock  # type: ignore
 
     # As currently designed, when this worker starts as "primary", we reinitialize redis
     # to a clean state (for our purposes, anyway)