diff --git a/.travis.yml b/.travis.yml
index 5523adc..32d4c29 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,7 +21,6 @@ addons:
   apt:
     sources:
       - ubuntu-toolchain-r-test
-      - llvm-toolchain-trusty-6.0
     packages:
       - gcc-8
       - clang-6.0