diff --git a/.travis.yml b/.travis.yml
index 8ae9a95..5d9444b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,8 @@ php:
     - 5.5
     - 5.6
     - 7.0
+    - 7.1
+    - 7.2
 
 matrix:
     fast_finish: true
@@ -20,6 +22,8 @@ env:
     - SYMFONY_VERSION=3.1.*
     - SYMFONY_VERSION=3.2.*
     - SYMFONY_VERSION=3.3.*
+    - SYMFONY_VERSION=3.4.*
+    - SYMFONY_VERSION=4.0.*
 
 before_install:
     - composer require symfony/framework-bundle:${SYMFONY_VERSION} --no-update
diff --git a/Resources/config/adapters.xml b/Resources/config/adapters.xml
index 44446a4..5e58ac5 100644
--- a/Resources/config/adapters.xml
+++ b/Resources/config/adapters.xml
@@ -17,7 +17,7 @@
 
     <services>
         <!-- Adapter collector -->
-        <service id="lexik_currency.adapter_collector" class="%lexik_currency.adapter_collector.class%" />
+        <service id="lexik_currency.adapter_collector" class="%lexik_currency.adapter_collector.class%" public="true" />
 
         <!-- Factory -->
         <service id="lexik_currency.adapter_factory" class="%lexik_currency.adapter_factory.class%">
diff --git a/composer.json b/composer.json
index 4becb48..5940a38 100644
--- a/composer.json
+++ b/composer.json
@@ -16,8 +16,11 @@
         }
     ],
     "require": {
-        "php": ">=5.5.9",
-        "symfony/framework-bundle": "~2.8|~3.0"
+        "php": ">=5.5.9|^7.0",
+        "symfony/framework-bundle": "~2.8|~3.0|~4.0"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^4.5|^5.7"
     },
     "autoload": {
         "psr-4": { "Lexik\\Bundle\\CurrencyBundle\\": "" }