diff --git a/cogs/utils/dict_utils.py b/cogs/utils/dict_utils.py
index eab05c4..a8ba624 100644
--- a/cogs/utils/dict_utils.py
+++ b/cogs/utils/dict_utils.py
@@ -11,7 +11,7 @@ def flatten(d, parent_key='', sep='/'):
     items = []
     for k, v in d.items():
         new_key = parent_key + sep + k if parent_key else k
-        if isinstance(v, collections.MutableMapping):
+        if isinstance(v, collections.abc.MutableMapping):
             items.extend(flatten(v, new_key, sep=sep).items())
         else:
             items.append((new_key, v))
diff --git a/requirements.txt b/requirements.txt
index 1705c7f..f9ef2f5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 discord.py == 1.7.*
-git+https://github.com/Devoxin/Lavalink.py@dev
+lavalink
 asyncio
 pyyaml
 BeautifulSoup4