-# Use the slower sudo-enabled VMs instead of fast containers:
-# - Package 'djvulibre-bin' is not yet whitelisted for trusty containers.
-# https://github.com/travis-ci/apt-package-whitelist/issues/4036
-sudo: required
-# Use Trusty instead of Travis default (precise)
+
+
+# Use fast containers instead of the slower sudo-enabled VMs:
+sudo: false
+# Use Ubuntu 14 Trusty (not Ubuntu 12 Precise)
+# <https://docs.travis-ci.com/user/reference/trusty/>