diff --git a/.travis.yml b/.travis.yml
index 4be1e29..543b251 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,8 +3,6 @@ dist: trusty
 sudo: required
 addons:
   apt:
-    sources:
-      - ubuntu-toolchain-r-test
     packages:
       - gcc-4.8
       - g++-4.8