diff --git a/.travis.yml b/.travis.yml
index 0f586fff70..049fb12bbe 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -42,7 +42,8 @@ before_install:
   - echo "extension=zmq.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
   - yes | pecl install imagick-beta
 install:
-  - travis_retry composer require --dev phpunit/phpunit --sort-packages --optimize-autoloader --update-with-dependencies --prefer-source
+  - if [[ $TRAVIS_PHP_VERSION = 5.* ]];then travis_retry composer install --optimize-autoloader --prefer-source; fi;
+  - if [[ $TRAVIS_PHP_VERSION = 7.* ]];then travis_retry composer remove --no-update phpunit/phpunit; travis_retry composer require --dev phpunit/phpunit --sort-packages --optimize-autoloader --update-with-dependencies --prefer-source; fi;
   - travis_retry npm install
 before_script:
   - mysql -e 'CREATE DATABASE update39_test;CREATE DATABASE ab_test;CREATE DATABASE db_test;SET @@global.sql_mode=STRICT_ALL_TABLES;SET @@global.max_allowed_packet=33554432;SET @@global.wait_timeout=999999;'
diff --git a/composer.json b/composer.json
index a41e3a86f2..b630e811d9 100644
--- a/composer.json
+++ b/composer.json
@@ -99,7 +99,8 @@
         "zend/gdata": "~1.12.1"
     },
     "require-dev":  {
-        "mikey179/vfsStream": "~1.5"
+        "mikey179/vfsStream": "~1.5",
+        "phpunit/phpunit": "^4.8"
     },
     "autoload":     {
         "psr-0": {