diff --git a/mypy-baseline.txt b/mypy-baseline.txt
index 04ecc768..005f3f6b 100644
--- a/mypy-baseline.txt
+++ b/mypy-baseline.txt
@@ -4,7 +4,6 @@ posthog/request.py:0: note: (or run "mypy --install-types" to install all missin
 posthog/request.py:0: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
 posthog/request.py:0: error: Incompatible types in assignment (expression has type "bytes", variable has type "str")  [assignment]
 posthog/consumer.py:0: error: Name "Empty" already defined (possibly by an import)  [no-redef]
-posthog/consumer.py:0: error: Need type annotation for "items" (hint: "items: list[<type>] = ...")  [var-annotated]
 posthog/consumer.py:0: error: Unsupported operand types for <= ("int" and "str")  [operator]
 posthog/consumer.py:0: note: Right operand is of type "int | str"
 posthog/consumer.py:0: error: Unsupported operand types for < ("str" and "int")  [operator]
diff --git a/posthog/consumer.py b/posthog/consumer.py
index 8f3fa3b5..6a9becbe 100644
--- a/posthog/consumer.py
+++ b/posthog/consumer.py
@@ -1,3 +1,4 @@
+from typing import Any
 import json
 import logging
 import time
@@ -96,7 +97,7 @@ def upload(self):
     def next(self):
         """Return the next batch of items to upload."""
         queue = self.queue
-        items = []
+        items: list[Any] = []
 
         start_time = time.monotonic()
         total_size = 0
diff --git a/posthog/utils.py b/posthog/utils.py
index c77236d6..8080ab90 100644
--- a/posthog/utils.py
+++ b/posthog/utils.py
@@ -5,7 +5,7 @@
 import time
 from collections import defaultdict
 from dataclasses import asdict, is_dataclass
-from datetime import date, datetime, timezone
+from datetime import date, datetime, timezone, timedelta
 from decimal import Decimal
 from typing import Any, Optional
 from uuid import UUID
@@ -16,18 +16,18 @@
 log = logging.getLogger("posthog")
 
 
-def is_naive(dt):
+def is_naive(dt: datetime) -> bool:
     """Determines if a given datetime.datetime is naive."""
     return dt.tzinfo is None or dt.tzinfo.utcoffset(dt) is None  # pragma: no mutate
 
 
-def total_seconds(delta):
-    """Determines total seconds with python < 2.7 compat."""
+def total_seconds(delta: timedelta) -> float:
+    """Return the total number of seconds contained in the duration."""
     # http://stackoverflow.com/questions/3694835/python-2-6-5-divide-timedelta-with-timedelta
     return (delta.microseconds + (delta.seconds + delta.days * 24 * 3600) * 1e6) / 1e6
 
 
-def guess_timezone(dt):
+def guess_timezone(dt: datetime) -> datetime:
     """Attempts to convert a naive datetime to an aware datetime."""
     if is_naive(dt):
         # attempts to guess the datetime.datetime.now() local timezone
@@ -44,7 +44,7 @@ def guess_timezone(dt):
     return dt
 
 
-def remove_trailing_slash(host):
+def remove_trailing_slash(host: str) -> str:
     if host.endswith("/"):
         return host[:-1]
     return host