diff --git a/.travis.yml b/.travis.yml
index f359af5..717aaa2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,51 +1,16 @@
 sudo: false
 language: cpp
+compiler: clang
+os: linux
+dist: trusty
 
 matrix:
   include:
-    - os: linux
-      dist: trusty
-      sudo: true
-      compiler: g++
-      before_install:
-        # C++17
-        - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
-        - sudo apt-get update -qq
-      install:
-        # C++17
-        - sudo apt-get install -qq g++-6
-        - sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-6 90
-      script:
+    - script:
         - cd build
         - cmake -DCMAKE_BUILD_TYPE=Debug ..
         - make -j
-    - os: linux
-      dist: trusty
-      compiler: clang
-      script:
-        - cd build
-        - cmake -DCMAKE_BUILD_TYPE=Debug ..
-        - make -j
-    - os: linux
-      dist: trusty
-      sudo: true
-      compiler: g++
-      before_install:
-        # C++17
-        - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
-        - sudo apt-get update -qq
-      install:
-        # C++17
-        - sudo apt-get install -qq g++-6
-        - sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-6 90
-      script:
-        - cd build
-        - cmake -DCMAKE_BUILD_TYPE=Release ..
-        - make -j
-    - os: linux
-      dist: trusty
-      compiler: clang
-      script:
+    - script:
         - cd build
         - cmake -DCMAKE_BUILD_TYPE=Release ..
         - make -j