diff --git a/antiphoneclapper/antiphoneclapper.py b/antiphoneclapper/antiphoneclapper.py
index f6e6b84..2923087 100644
--- a/antiphoneclapper/antiphoneclapper.py
+++ b/antiphoneclapper/antiphoneclapper.py
@@ -113,5 +113,5 @@ class AntiPhoneClapper(BaseCog):
             else:
                 return
 
-    def __unload(self):
+    def cog_unload(self):
         self.bot.loop.create_task(self.session.close())
diff --git a/blurplefy/blurplefy.py b/blurplefy/blurplefy.py
index 0c67eef..bf66566 100644
--- a/blurplefy/blurplefy.py
+++ b/blurplefy/blurplefy.py
@@ -20,9 +20,7 @@ darkblurple = (78, 93, 148)
 white = (255, 255, 255)
 
 
-BaseCog = getattr(commands, "Cog", object)
-
-class Blurplefy(BaseCog):
+class Blurplefy(commands.Cog):
     def __init__(self, bot):
         """Blurplefy images and check content of images."""
         self.bot = bot
@@ -437,5 +435,5 @@ class Blurplefy(BaseCog):
             msg = ""
         return msg.format(d, h, m, s)
 
-    def __unload(self):
-        self.session.close()
+    def cog_unload(self):
+        self.bot.loop.create_task(self.session.close())
diff --git a/inspirobot/inspirobot.py b/inspirobot/inspirobot.py
index ac9b74e..264e19a 100644
--- a/inspirobot/inspirobot.py
+++ b/inspirobot/inspirobot.py
@@ -3,9 +3,7 @@ import discord
 from redbot.core import commands
 
 
-BaseCog = getattr(commands, "Cog", object)
-
-class Inspirobot(BaseCog):
+class Inspirobot(commands.Cog):
     """Posts images generated by https://inspirobot.me"""
     def __init__(self, bot):
         self.bot = bot
@@ -25,5 +23,5 @@ class Inspirobot(BaseCog):
         except Exception as e:
             await ctx.send(f"Oops, there was a problem: {e}")
 
-    def __unload(self):
-        self.session.close()
+    def cog_unload(self):
+        self.bot.loop.create_task(self.session.close())
diff --git a/retrosign/retrosign.py b/retrosign/retrosign.py
index 6611b5d..8f48515 100644
--- a/retrosign/retrosign.py
+++ b/retrosign/retrosign.py
@@ -12,9 +12,7 @@ import re
 import unicodedata
 
 
-BaseCog = getattr(commands, "Cog", object)
-
-class Retrosign(BaseCog):
+class Retrosign(commands.Cog):
     """Make an 80s retro sign. Originally by Anismash"""
     def __init__(self, bot):
         self.bot = bot
@@ -79,5 +77,5 @@ class Retrosign(BaseCog):
                                 image = discord.File(fp=temp_image, filename="image.png")
                                 await ctx.channel.send(file=image)
 
-    def __unload(self):
-        self.session.detach()
+    def cog_unload(self):
+        self.bot.loop.create_task(self.session.close())
diff --git a/wolfram/wolfram.py b/wolfram/wolfram.py
index a7f2b49..08e4eed 100644
--- a/wolfram/wolfram.py
+++ b/wolfram/wolfram.py
@@ -5,10 +5,7 @@ from redbot.core.utils.chat_formatting import box
 import xml.etree.ElementTree as ET
 
 
-BaseCog = getattr(commands, "Cog", object)
-
-
-class Wolfram(BaseCog):
+class Wolfram(commands.Cog):
     """Ask Wolfram Alpha any question."""
 
     def __init__(self, bot):
@@ -55,5 +52,5 @@ class Wolfram(BaseCog):
             await self.config.WOLFRAM_API_KEY.set(key)
             await ctx.send("Key set.")
 
-    def __unload(self):
+    def cog_unload(self):
         self.bot.loop.create_task(self.session.close())