diff --git a/nest_crawler/authentication.py b/nest_crawler/authentication.py
index 4b369c2..e4b68d8 100644
--- a/nest_crawler/authentication.py
+++ b/nest_crawler/authentication.py
@@ -1,11 +1,12 @@
 import tweepy as tw
+import os
 
 
 def authenticate():
-    c_k = "GEhtSyP9e98mzFeiOCSW0lvQX"
-    c_s = "438cmYrl5xqaX2W7I2Bf5A9nF1pN5VtM9f77WYQnAXg1BwKJ27"
-    a_t = "1380217745732689921-IW3U1JlxhnQeGBUrnHZ2nxbxhksXUZ"
-    a_t_s = "EUoYNoj72rb2q00tUIW8eTcLJAhUAYPstZlV78W9cPpEJ"
+    c_k = os.getenv('C_K')
+    c_s = os.getenv('C_S')
+    a_t = os.getenv('A_T')
+    a_t_s = os.getenv('A_T_S')
 
     auth = tw.OAuthHandler(c_k, c_s)
     auth.set_access_token(a_t, a_t_s)