diff --git a/.travis.yml b/.travis.yml
index a241bf0..939b7ec 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,8 +11,9 @@ env:
     global:
         - SYMFONY_PHPUNIT_DIR=$HOME/.phpunit-bridge
         - SYMFONY_PHPUNIT_REMOVE='' # don't remove prophecy
+        - SYMFONY_PHPUNIT_REMOVE_RETURN_TYPEHINT=1
 
-php: [7.2, 7.1, 7.0, 5.6, 5.5, 5.4]
+php: [7.2, 7.1, 7.0, 5.6]
 
 matrix:
     include:
@@ -20,6 +21,10 @@ matrix:
           env: COMPOSER_FLAGS='--prefer-lowest --prefer-stable'
         - php: 5.3
           dist: precise
+        - php: 5.4
+          dist: trusty
+        - php: 5.5
+          dist: trusty
         - php: 7.2
           env: STABILITY=dev
 
diff --git a/composer.json b/composer.json
index f5e257b..275e83c 100644
--- a/composer.json
+++ b/composer.json
@@ -12,12 +12,12 @@
     ],
     "require": {
         "php": ">=5.3.3",
-        "symfony/yaml": "^2.3 || ^3.0 || ^4.0"
+        "symfony/yaml": "^2.3 || ^3.0 || ^4.0 || ^5.0"
     },
     "require-dev": {
         "composer/composer": "^1.0@dev",
-        "symfony/filesystem": "^2.3 || ^3 || ^4",
-        "symfony/phpunit-bridge": "^4.0"
+        "symfony/filesystem": "^2.3 || ^3 || ^4 || ^5",
+        "symfony/phpunit-bridge": "^4.0 || ^5.0"
     },
     "autoload": {
         "psr-4": { "Incenteev\\ParameterHandler\\": "" }