diff --git a/.travis.yml b/.travis.yml
index aee42cd3..405a2587 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -30,19 +30,10 @@ matrix:
 
   - os: linux
     compiler: clang
-    env: COMPILER=clang++-3.4
+    env: COMPILER=clang++
     addons:
       apt:
-        sources: ['ubuntu-toolchain-r-test']
-        packages: ['g++-6', 'clang-3.4']
-
-  - os: linux
-    compiler: clang
-    env: COMPILER=clang++-3.5
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.5']
-        packages: ['g++-6', 'clang-3.5']
+        packages: ['clang-3.4']
 
 ################
 # build script #