diff --git a/roletiers/__init__.py b/roletiers/__init__.py
index e94a9c3..060881e 100644
--- a/roletiers/__init__.py
+++ b/roletiers/__init__.py
@@ -9,4 +9,4 @@
 async def setup(bot):
     cog = RoleTiers(bot)
     await cog.initialize()
-    bot.add_cog(cog)
+    await bot.add_cog(cog)
diff --git a/roletiers/roletiers.py b/roletiers/roletiers.py
index a0854ee..984e3cf 100644
--- a/roletiers/roletiers.py
+++ b/roletiers/roletiers.py
@@ -22,7 +22,7 @@
 SOFTWARE.
 """
 
-from datetime import datetime, timedelta
+from datetime import datetime, timezone, timedelta
 
 import discord
 from discord.ext import tasks
@@ -87,7 +87,7 @@ def cog_unload(self):
 
     @staticmethod
     async def _seconds_since(time: datetime):
-        return (datetime.utcnow() - time).total_seconds()
+        return (datetime.now(timezone.utc) - time).total_seconds()
 
     @commands.Cog.listener("on_message_without_command")
     async def _message_listener(self, message: discord.Message):