diff --git a/.travis.yml b/.travis.yml
index 9d99744..62f465b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,6 +23,8 @@ matrix:
           env: SYMFONY_VERSION=2.8.*
         - php: 5.5
           env: SYMFONY_VERSION=3.4.*
+        - php: 7.1
+          env: SYMFONY_VERSION=4.0.* PHPUNIT_VERSION=5.7.*
         - php: hhvm
           sudo: required
           dist: trusty
@@ -36,6 +38,7 @@ before_install:
 
 before_script:
     - if [ "$SYMFONY_VERSION" != "" ]; then composer require "symfony/symfony:${SYMFONY_VERSION}" --dev --no-update; fi;
+    - if [ "$PHPUNIT_VERSION" != "" ]; then composer require "phpunit/phpunit:${PHPUNIT_VERSION}" --dev --no-update; fi;
     - composer install --prefer-dist --no-interaction --no-scripts --no-progress
 
 script: