diff --git a/.travis.yml b/.travis.yml
index bf7568d..28c01b9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,10 @@
 language: php
 
 php:
-  - 7.0
   - 7.1
   - 7.2
+  - 7.3
+  - 7.4snapshot
 
 sudo: false
 
@@ -12,23 +13,24 @@ cache:
     - .phpunit
     - $HOME/.composer/cache
 
-branches:
-  only:
-    - master
-    - dev
-    - /^\d+\.\d+$/
-
 matrix:
   fast_finish: true
   include:
-    - php: 7.0
+    - php: 7.1
       env: COMPOSER_FLAGS="--prefer-lowest"
     - php: 7.2
-      env: COMPOSER_FLAGS="--prefer-lowest"
+      env: SYMFONY_VERSION=^3.4
+    - php: 7.3
+      env: SYMFONY_VERSION=^4.0
+    - php: 7.3
+      env: SYMFONY_VERSION=^5.0
+  allow_failures:
+    - php: 7.4snapshot
 
 before_install:
-    - phpenv config-rm xdebug.ini
+    - phpenv config-rm xdebug.ini || true
+    - if [ "$SYMFONY_VERSION" != "" ]; then composer require "symfony/symfony:${SYMFONY_VERSION}" --dev --no-update; fi;
 
-install: composer update $COMPOSER_FLAGS
+install: composer update --no-interaction $COMPOSER_FLAGS
 
 script: ./phpunit
diff --git a/Form/Extension/DocumentationExtension.php b/Form/Extension/DocumentationExtension.php
index a27d83d..0bebeef 100644
--- a/Form/Extension/DocumentationExtension.php
+++ b/Form/Extension/DocumentationExtension.php
@@ -37,7 +37,7 @@ class DocumentationExtension extends AbstractTypeExtension
         return self::getExtendedTypes()[0];
     }
 
-    public static function getExtendedTypes()
+    public static function getExtendedTypes(): iterable
     {
         return [FormType::class];
     }
diff --git a/Tests/Functional/TestKernel.php b/Tests/Functional/TestKernel.php
index 745ce8c..862dd83 100644
--- a/Tests/Functional/TestKernel.php
+++ b/Tests/Functional/TestKernel.php
@@ -105,6 +105,7 @@ class TestKernel extends Kernel
     protected function configureContainer(ContainerBuilder $c, LoaderInterface $loader)
     {
         $framework = [
+            'assets' => true,
             'secret' => 'MySecretKey',
             'test' => null,
             'validation' => null,
diff --git a/composer.json b/composer.json
index 410e2ce..ee6f282 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
         }
     ],
     "require": {
-        "php": "^7.0",
+        "php": "^7.1",
         "symfony/framework-bundle": "^3.4|^4.0|^5.0",
         "symfony/options-resolver": "^3.4.4|^4.0|^5.0",
         "symfony/property-info": "^3.4|^4.0|^5.0",
@@ -42,10 +42,10 @@
         "doctrine/annotations": "^1.2",
         "doctrine/common": "^2.4",
 
-        "api-platform/core": "^2.1.0",
+        "api-platform/core": "^2.1.2",
         "friendsofsymfony/rest-bundle": "^2.0",
         "willdurand/hateoas-bundle": "^1.0|^2.0",
-        "jms/serializer-bundle": "^2.0|^3.0",
+        "jms/serializer-bundle": "^2.3|^3.0",
         "jms/serializer": "^1.14|^3.0"
     },
     "suggest": {
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 58e4a52..6012f71 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -10,7 +10,7 @@
     <php>
         <env name="SHELL_VERBOSITY" value="-1" />
         <ini name="error_reporting" value="-1" />
-        <env name="SYMFONY_DEPRECATIONS_HELPER" value="weak_vendors" />
+        <env name="SYMFONY_DEPRECATIONS_HELPER" value="max[self]=0" />
     </php>
 
     <testsuites>