diff --git a/tweetbot.py b/tweetbot.py
index 538a83e..4e29ec4 100644
--- a/tweetbot.py
+++ b/tweetbot.py
@@ -8,11 +8,11 @@ from time import sleep
 from random import shuffle
 
 
-def get_arguments() -> Tuple[str, str, str, str]:
-    consumer_key = os.environ['CONSUMER_KEY']
-    consumer_secret = os.environ['CONSUMER_SECRET']
-    access_token = os.environ['ACCESS_TOKEN']
-    access_token_secret = os.environ['ACCESS_TOKEN_SECRET']
+def get_arguments() -> Tuple[bytes, bytes, bytes, bytes]:
+    consumer_key = os.environ['CONSUMER_KEY'].encode('utf8')
+    consumer_secret = os.environ['CONSUMER_SECRET'].encode('utf8')
+    access_token = os.environ['ACCESS_TOKEN'].encode('utf8')
+    access_token_secret = os.environ['ACCESS_TOKEN_SECRET'].encode('utf8')
 
     return consumer_key, consumer_secret, access_token, access_token_secret