diff --git a/.travis.yml b/.travis.yml
index 9a7fcb376a2bb56e2acd8e5608d467ab3d42ef4f..d0eb8ffa6dd07a821e3841cf2844583ed9b37082 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,7 +23,7 @@ addons:
       - cmake
 
 script:
-    - apt-get upgrade cmake
+    - sudo apt-get upgrade cmake
     - mkdir -p build
     - cd build && cmake .. && make && make test
     - if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then bash ./travis/run_on_pull_requests; fi