diff --git a/.travis.yml b/.travis.yml
index 72ecfad..d8db321 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,8 +14,6 @@ cache:
     - node_modules
 addons:
   apt:
-    sources:
-      - ubuntu-toolchain-r-test
     packages:
       - gcc-4.8
       - g++-4.8