diff --git a/.travis.yml b/.travis.yml
index 0d869178..be79e9fe 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,7 +12,9 @@ matrix:
     - php: 5.3
       dist: precise
     - php: 5.4
+      dist: trusty
     - php: 5.5
+      dist: trusty
     - php: 5.6
     - php: 7.0
       env: WITH_COVERAGE=true