diff --git a/.travis.yml b/.travis.yml
index 7117037..dc07a0e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,7 @@ services:
     - mysql
 
 php:
+    - 5.6
     - 7.0
     - 7.1
     - nightly
diff --git a/composer.json b/composer.json
index ca80f08..36c3298 100644
--- a/composer.json
+++ b/composer.json
@@ -4,12 +4,12 @@
     "description": "Provide a real database, safe for testing purposes",
     "license":     "MIT",
     "require": {
-        "php":          "^7.0",
+        "php":          "^5.6|^7.0",
         "doctrine/orm": "^2.5.4"
     },
     "require-dev": {
-        "hostnet/phpcs-tool": "^5.2.1",
-        "phpunit/phpunit":    "^6.4.1"
+        "hostnet/phpcs-tool": "^4.0.6",
+        "phpunit/phpunit":    "^5.3.2"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/ConnectionInterface.php b/src/ConnectionInterface.php
index 6b6f434..139bb38 100644
--- a/src/ConnectionInterface.php
+++ b/src/ConnectionInterface.php
@@ -2,7 +2,6 @@
 /**
  * @copyright 2016-2017 Hostnet B.V.
  */
-declare(strict_types = 1);
 namespace Hostnet\Component\DatabaseTest;
 
 /**
@@ -22,5 +21,5 @@ interface ConnectionInterface
      *
      * @return array
      */
-    public function getConnectionParams(): array;
+    public function getConnectionParams();
 }
diff --git a/src/MysqlPersistentConnection.php b/src/MysqlPersistentConnection.php
index f55543e..3de8456 100644
--- a/src/MysqlPersistentConnection.php
+++ b/src/MysqlPersistentConnection.php
@@ -2,7 +2,6 @@
 /**
  * @copyright 2016-2017 Hostnet B.V.
  */
-declare(strict_types = 1);
 namespace Hostnet\Component\DatabaseTest;
 
 /**
@@ -82,7 +81,7 @@ public function __destruct()
      * {@inheritdoc}
      * @return array
      */
-    public function getConnectionParams(): array
+    public function getConnectionParams()
     {
         return $this->connection_params;
     }
diff --git a/test/MysqlPersistentConnectionTest.php b/test/MysqlPersistentConnectionTest.php
index a3b83f4..de6b315 100644
--- a/test/MysqlPersistentConnectionTest.php
+++ b/test/MysqlPersistentConnectionTest.php
@@ -2,8 +2,6 @@
 /**
  * @copyright 2016-2017 Hostnet B.V.
  */
-declare(strict_types=1);
-
 namespace Hostnet\Component\DatabaseTest;
 
 use Doctrine\DBAL\DriverManager;
@@ -53,7 +51,7 @@ public function testDestruction()
      * @return string[]
      * @throws \Doctrine\DBAL\DBALException
      */
-    private function listDatabases(array $params): array
+    private function listDatabases(array $params)
     {
         $doctrine  = DriverManager::getConnection($params);
         $statement = $doctrine->executeQuery('SHOW DATABASES');