diff --git a/mirror_bot.py b/mirror_bot.py
index 8f74544..5b97c00 100755
--- a/mirror_bot.py
+++ b/mirror_bot.py
@@ -8,22 +8,14 @@ import cursor
 import aiohttp
 import pleroma
 import argparse
-import platform
 import pendulum
 import aiosqlite
 import contextlib
 import qtoml as toml
-from utils import suppress, loading_spinner
 from pleroma import Pleroma
 from functools import partial
+from utils import suppress, loading_spinner, http_session_factory
 
-USER_AGENT = (
-	'mirror-bot; '
-	f'{aiohttp.__version__}; '
-	f'{platform.python_implementation()}/{platform.python_version()}'
-)
-
-UTC = pendulum.timezone('UTC')
 JSON_CONTENT_TYPE = 'application/json'
 ACTIVITYPUB_CONTENT_TYPE = 'application/activity+json'
 
@@ -37,9 +29,8 @@ class PostMirror:
 			Pleroma(api_base_url=self.config['site'], access_token=self.config['access_token']),
 		)
 		self._http = await stack.enter_async_context(
-			aiohttp.ClientSession(
+			http_session_factory(
 				headers={
-					'User-Agent': USER_AGENT,
 					'Accept': ', '.join([JSON_CONTENT_TYPE, ACTIVITYPUB_CONTENT_TYPE]),
 				},
 				trust_env=True,
diff --git a/pleroma.py b/pleroma.py
index dae25ef..d07b571 100644
--- a/pleroma.py
+++ b/pleroma.py
@@ -5,19 +5,9 @@ import yarl
 import json
 import hashlib
 import aiohttp
-from multidict import MultiDict
 from http import HTTPStatus
-
-def http_session_factory(headers={}):
-	py_version = '.'.join(map(str, sys.version_info))
-	user_agent = (
-		'pleroma-ebooks (https://lab.freak.university/KayFaraday/pleroma-ebooks); '
-		'aiohttp/{aiohttp.__version__}; '
-		'python/{py_version}'
-	)
-	return aiohttp.ClientSession(
-		headers={'User-Agent': user_agent, **headers},
-	)
+from multidict import MultiDict
+from utils import http_session_factory
 
 class BadRequest(Exception):
 	pass
diff --git a/utils.py b/utils.py
index e85fea0..d1dcfaf 100644
--- a/utils.py
+++ b/utils.py
@@ -1,10 +1,23 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 import anyio
+import aiohttp
+import platform
 import itertools
 import contextlib
 from functools import wraps
 
+def http_session_factory(headers={}, **kwargs):
+	user_agent = (
+		'mirror-bot (https://lab.freak.university/KayFaraday/mirror-bot); '
+		f'aiohttp/{aiohttp.__version__}; '
+		f'{platform.python_implementation()}/{platform.python_version()}'
+	)
+	return aiohttp.ClientSession(
+		headers={'User-Agent': user_agent, **headers},
+		**kwargs,
+	)
+
 def as_corofunc(f):
 	@wraps(f)
 	async def wrapped(*args, **kwargs):