diff --git a/.travis.yml b/.travis.yml
index b16ae35..d55f308 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,14 +21,6 @@ matrix:
       dist: trusty
       addons: { apt: { sources: ubuntu-toolchain-r-test, packages: ["xorg-dev", "g++-8"] } }
       env: MATRIX_EVAL="CC=gcc-8 && CXX=g++-8"
-    - os: linux
-      dist: trusty
-      addons: { apt: { sources: ["ubuntu-toolchain-r-test", "llvm-toolchain-precise-3.6"], packages: ["xorg-dev", "clang-3.6", "g++-5"] } }
-      env: MATRIX_EVAL="CC=clang-3.6 && CXX=clang++-3.6"
-    - os: linux
-      dist: trusty
-      addons: { apt: { sources: ["ubuntu-toolchain-r-test", "llvm-toolchain-precise-3.7"], packages: ["xorg-dev", "clang-3.7", "g++-5"] } }
-      env: MATRIX_EVAL="CC=clang-3.7 && CXX=clang++-3.7"
     - os: linux
       dist: trusty
       addons: { apt: { sources: ["ubuntu-toolchain-r-test", "llvm-toolchain-precise-3.8"], packages: ["xorg-dev", "clang-3.8", "g++-5"] } }