diff --git a/.travis.yml b/.travis.yml
index f589430..7be569e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,17 +4,17 @@ cache:
   directories:
     - $COMPOSER_CACHE_DIR
     - $HOME/.composer/cache
-    - $TRAVIS_BUILD_DIR/build
+    - build
 
 language: php
 
 php:
-  - 5.6
-  - 7.0
-  - 7.1
+  - 7.2
+  - nightly
 
-before_script:
-  - if [[ $TRAVIS_PHP_VERSION != "5.6" ]]; then phpenv config-rm xdebug.ini; fi
+matrix:
+  allow_failures:
+    - php: nightly
 
 script:
-  - if [[ $TRAVIS_PHP_VERSION == "5.6" ]]; then make test-coveralls; else make test; fi
+  - if [[ $TRAVIS_PHP_VERSION == "7.2" ]]; then make test-coveralls; else make test; fi
diff --git a/LICENSE b/LICENSE
index 26ac4fa..8839aca 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,7 +1,7 @@
 icanboogie/bind-activerecord is free software.
 It is released under the terms of the following BSD License.
 
-Copyright (c) 2015-2017 by Olivier Laviale
+Copyright (c) 2015-2018 by Olivier Laviale
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification,
diff --git a/Makefile b/Makefile
index a5f1a85..68c2a94 100644
--- a/Makefile
+++ b/Makefile
@@ -1,15 +1,13 @@
 # customization
 
 PACKAGE_NAME = icanboogie/bind-activerecord
-PACKAGE_VERSION = 4.0
-PHPUNIT_VERSION = phpunit-5.7.phar
+PACKAGE_VERSION = 5.0
+PHPUNIT_VERSION = phpunit-7.phar
 PHPUNIT_FILENAME = build/$(PHPUNIT_VERSION)
 PHPUNIT = php $(PHPUNIT_FILENAME)
 
 # do not edit the following lines
 
-all: $(PHPUNIT_FILENAME) vendor
-
 usage:
 	@echo "test:  Runs the test suite.\ndoc:   Creates the documentation.\nclean: Removes the documentation, the dependencies and the Composer files."
 
@@ -22,18 +20,20 @@ update:
 autoload: vendor
 	@composer dump-autoload
 
+test-dependencies: vendor $(PHPUNIT_FILENAME)
+
 $(PHPUNIT_FILENAME):
 	mkdir -p build
-	wget https://phar.phpunit.de/$(PHPUNIT_VERSION) -O $(PHPUNIT_FILENAME)
+	wget https://phar.phpunit.de/$(PHPUNIT_VERSION) -O $(PHPUNIT_FILENAME) -q
 
-test: all
+test: test-dependencies
 	@$(PHPUNIT)
 
-test-coverage: all
+test-coverage: test-dependencies
 	@mkdir -p build/coverage
 	@$(PHPUNIT) --coverage-html ../build/coverage
 
-test-coveralls: all
+test-coveralls: test-dependencies
 	@mkdir -p build/logs
 	COMPOSER_ROOT_VERSION=$(PACKAGE_VERSION) composer require satooshi/php-coveralls
 	@$(PHPUNIT) --coverage-clover ../build/logs/clover.xml
@@ -52,4 +52,4 @@ clean:
 	@rm -fR vendor
 	@rm -f composer.lock
 
-.PHONY: all autoload doc clean test test-coverage test-coveralls update
+.PHONY: all autoload doc clean test test-coverage test-coveralls test-dependencies update
diff --git a/README.md b/README.md
index 21b805c..ecdc7f7 100644
--- a/README.md
+++ b/README.md
@@ -118,7 +118,7 @@ return [
 
 ## Requirements
 
-The package requires PHP 5.6 or later.
+The package requires PHP 7.2 or later.
 
 
 
@@ -180,8 +180,8 @@ The package is continuously tested by [Travis CI](http://about.travis-ci.org/).
 
 
 
-[documentation]:           https://icanboogie.org/api/bind-activerecord/4.0/
-[ConnectionCollection]:    https://icanboogie.org/api/activerecord/4.0/class-ICanBoogie.ActiveRecord.ConnectionCollection.html
-[ModelCollection]:         https://icanboogie.org/api/activerecord/4.0/class-ICanBoogie.ActiveRecord.ModelCollection.html
+[documentation]:           https://icanboogie.org/api/bind-activerecord/5.0/
+[ConnectionCollection]:    https://icanboogie.org/api/activerecord/5.0/class-ICanBoogie.ActiveRecord.ConnectionCollection.html
+[ModelCollection]:         https://icanboogie.org/api/activerecord/5.0/class-ICanBoogie.ActiveRecord.ModelCollection.html
 [icanboogie/activerecord]: https://github.com/ICanBoogie/ActiveRecord
 [ICanBoogie]:              https://github.com/ICanBoogie/ICanBoogie
diff --git a/composer.json b/composer.json
index d29f77e..873b806 100644
--- a/composer.json
+++ b/composer.json
@@ -20,9 +20,9 @@
 	"prefer-stable": true,
 	"prefer-dist": true,
 	"require": {
-		"php": ">=5.6",
-		"icanboogie/icanboogie": "^4.0",
-		"icanboogie/activerecord": "^4.0"
+		"php": "^7.2",
+		"icanboogie/icanboogie": "^5.0",
+		"icanboogie/activerecord": "^5.0"
 	},
 	"autoload": {
 		"psr-4": {
diff --git a/lib/Hooks.php b/lib/Hooks.php
index 2fad2c0..df4e519 100644
--- a/lib/Hooks.php
+++ b/lib/Hooks.php
@@ -32,7 +32,7 @@ class Hooks
 	 *
 	 * @return array
 	 */
-	static private function synthesize_config_from_namespace(array $fragments, $namespace)
+	static private function synthesize_config_from_namespace(array $fragments, string $namespace): array
 	{
 		$config = [];
 
@@ -46,7 +46,7 @@ static private function synthesize_config_from_namespace(array $fragments, $name
 			$config[] = $fragment[$namespace];
 		}
 
-		return $config ? call_user_func_array('array_merge', $config) : [];
+		return $config ? array_merge(...$config) : [];
 	}
 
 	/**
@@ -56,7 +56,7 @@ static private function synthesize_config_from_namespace(array $fragments, $name
 	 *
 	 * @return array
 	 */
-	static public function synthesize_connections_config(array $fragments)
+	static public function synthesize_connections_config(array $fragments): array
 	{
 		return self::synthesize_config_from_namespace($fragments, 'connections');
 	}
@@ -68,7 +68,7 @@ static public function synthesize_connections_config(array $fragments)
 	 *
 	 * @return array
 	 */
-	static public function synthesize_models_config(array $fragments)
+	static public function synthesize_models_config(array $fragments): array
 	{
 		return self::synthesize_config_from_namespace($fragments, 'models');
 	}
@@ -85,7 +85,7 @@ static public function synthesize_models_config(array $fragments)
 	 * @param Application\BootEvent $event
 	 * @param Application $app
 	 */
-	static public function on_app_boot(Application\BootEvent $event, Application $app)
+	static public function on_app_boot(Application\BootEvent $event, Application $app): void
 	{
 		ActiveRecord\ModelProvider::define(function($id) use ($app) {
 
@@ -106,7 +106,7 @@ static public function on_app_boot(Application\BootEvent $event, Application $ap
 	 *
 	 * @return ConnectionCollection
 	 */
-	static public function app_lazy_get_connections(Application $app)
+	static public function app_lazy_get_connections(Application $app): ConnectionCollection
 	{
 		static $connections;
 
@@ -126,7 +126,7 @@ static public function app_lazy_get_connections(Application $app)
 	 *
 	 * @return ModelCollection
 	 */
-	static public function app_lazy_get_models(Application $app)
+	static public function app_lazy_get_models(Application $app): ModelCollection
 	{
 		static $models;
 
@@ -145,7 +145,7 @@ static public function app_lazy_get_models(Application $app)
 	 *
 	 * @return Connection
 	 */
-	static public function app_lazy_get_db(Application $app)
+	static public function app_lazy_get_db(Application $app): Connection
 	{
 		return $app->connections['primary'];
 	}
@@ -174,7 +174,7 @@ static public function active_record_validate(ActiveRecord $record)
 	 *
 	 * @return RuntimeActiveRecordCache
 	 */
-	static public function model_lazy_get_activerecord_cache(Model $model)
+	static public function model_lazy_get_activerecord_cache(Model $model): RuntimeActiveRecordCache
 	{
 		return new RuntimeActiveRecordCache($model);
 	}