diff --git a/.gitignore b/.gitignore
index c46586e..e7049e4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@ vendor
 testapp/app/cache
 testapp/app/logs
 .htaccess
+/var
diff --git a/.travis.yml b/.travis.yml
index 95d354c..d234a68 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,19 +19,23 @@ matrix:
     - php: 5.6
       env: SYMFONY_VERSION='2.8.*'
     - php: 7.1
-      env: SYMFONY_VERSION='3.3.*'
+      env: SYMFONY_VERSION='^3.4'
     - php: 7.1
-      env: DEPS=dev SYMFONY_VERSION='3.4.*'
-    - php: 7.1
-      env: DEVS=dev SYMFONY_VERSION='4.0.*'
+      env: SYMFONY_VERSION='^4.3'
+    - php: 7.2
+      env: SYMFONY_VERSION='^4.4'
+    - php: 7.3
+      env: SYMFONY_VERSION='5.0.*'
+    - php: 7.4
+      env: SYMFONY_VERSION='^5.0'
   allow_failures:
-    - php: 7.1
-      env: SYMFONY_VERSION='4.0.x-dev'
+    - php: 7.4
+      env: DEPS=dev SYMFONY_VERSION='^5.0@dev'
 
 before_install:
   - composer self-update
   - mkdir -p ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d && echo "memory_limit=-1" >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
-  - if [ "$DEPS" = 'dev' ]; then perl -pi -e 's/^}$/,"minimum-stability":"dev"}/' composer.json; fi;
+  - if [ "$DEPS" != "" ]; then composer config minimum-stability $DEPS; fi;
   - if [ "$SYMFONY_VERSION" != "" ]; then composer require --no-update "symfony/symfony:${SYMFONY_VERSION}"; fi;
 
 install:
diff --git a/composer.json b/composer.json
index c6d421e..38b68de 100644
--- a/composer.json
+++ b/composer.json
@@ -19,16 +19,16 @@
     "require": {
         "php":                       ">=5.3.3",
         "behat/behat":               "^3.4.3",
-        "symfony/framework-bundle":  "~2.0|~3.0|~4.0"
+        "symfony/framework-bundle":  "~2.0|~3.0|~4.0|~5.0"
     },
 
     "require-dev": {
-        "symfony/symfony":               "~2.1|~3.0|~4.0",
+        "symfony/symfony":               "~2.1|~3.0|~4.0|~5.0",
         "behat/mink-extension":          "~2.0",
         "behat/mink":                    "~1.7@dev",
         "behat/mink-browserkit-driver":  "~1.3@dev",
-        "phpspec/phpspec":               "~2.0|~3.0|~4.0",
-        "phpunit/phpunit":               "~4.0|~5.0"
+        "phpspec/phpspec":               "~2.0|~3.0|~4.0|~5.0|~6.0",
+        "phpunit/phpunit":               "^4.8 || ^5.7 || ^6.0 || ^7.0 || ^8.0 || ^9.0"
     },
 
     "autoload": {
diff --git a/features/bootstrap/FeatureContext.php b/features/bootstrap/FeatureContext.php
index 3491df5..0b46896 100644
--- a/features/bootstrap/FeatureContext.php
+++ b/features/bootstrap/FeatureContext.php
@@ -4,6 +4,12 @@
 use Behat\Gherkin\Node\PyStringNode;
 use Symfony\Component\Process\PhpExecutableFinder;
 use Symfony\Component\Process\Process;
+use PHPUnit\Framework\Assert;
+
+// BC Layer for older PHPUnit versions.
+if (!class_exists('PHPUnit\Framework\Assert')) {
+    class_alias('PHPUnit_Framework_Assert', 'PHPUnit\Framework\Assert');
+}
 
 /**
  * Behat context class.
@@ -82,7 +88,7 @@ public function itShouldPassWith($success, PyStringNode $text)
      */
     public function theOutputShouldContain(PyStringNode $text)
     {
-        PHPUnit_Framework_Assert::assertContains($this->getExpectedOutput($text), $this->getOutput());
+        Assert::assertContains($this->getExpectedOutput($text), $this->getOutput());
     }
 
     private function getExpectedOutput(PyStringNode $expectedText)
@@ -125,13 +131,13 @@ public function itShouldFail($success)
                 echo 'Actual output:' . PHP_EOL . PHP_EOL . $this->getOutput();
             }
 
-            PHPUnit_Framework_Assert::assertNotEquals(0, $this->getExitCode());
+            Assert::assertNotEquals(0, $this->getExitCode());
         } else {
             if (0 !== $this->getExitCode()) {
                 echo 'Actual output:' . PHP_EOL . PHP_EOL . $this->getOutput();
             }
 
-            PHPUnit_Framework_Assert::assertEquals(0, $this->getExitCode());
+            Assert::assertEquals(0, $this->getExitCode());
         }
     }
 
diff --git a/testapp/behat.yml b/testapp/behat.yml
index ef6da1c..64168a3 100644
--- a/testapp/behat.yml
+++ b/testapp/behat.yml
@@ -1,4 +1,6 @@
 default:
+    translation:
+        locale: en
     formatters:
         progress:
             paths: false
diff --git a/testapp/src/Behat/Sf2DemoBundle/Features/Context/FeatureContext.php b/testapp/src/Behat/Sf2DemoBundle/Features/Context/FeatureContext.php
index 7072c9e..e52a18d 100644
--- a/testapp/src/Behat/Sf2DemoBundle/Features/Context/FeatureContext.php
+++ b/testapp/src/Behat/Sf2DemoBundle/Features/Context/FeatureContext.php
@@ -4,6 +4,12 @@
 
 use Symfony\Component\HttpKernel\KernelInterface;
 use Behat\Symfony2Extension\Context\KernelAwareContext;
+use PHPUnit\Framework\Assert;
+
+// BC Layer for older PHPUnit versions.
+if (!class_exists('PHPUnit\Framework\Assert')) {
+    class_alias('PHPUnit_Framework_Assert', 'PHPUnit\Framework\Assert');
+}
 
 class FeatureContext implements KernelAwareContext
 {
@@ -27,7 +33,7 @@ public function setKernel(KernelInterface $kernel)
      */
     public function iHaveAKernelInstance()
     {
-        \PHPUnit_Framework_Assert::assertInstanceOf('Symfony\\Component\\HttpKernel\\KernelInterface', $this->kernel);
+        Assert::assertInstanceOf('Symfony\\Component\\HttpKernel\\KernelInterface', $this->kernel);
     }
 
     /**
@@ -43,7 +49,7 @@ public function iGetContainerParametersFromIt()
      */
     public function thereShouldBeParameter($key)
     {
-        \PHPUnit_Framework_Assert::assertArrayHasKey($key, $this->containerParameters);
+        Assert::assertArrayHasKey($key, $this->containerParameters);
         $this->parameterKey = $key;
     }
 
@@ -52,7 +58,7 @@ public function thereShouldBeParameter($key)
      */
     public function thereShouldNotBeParameter($key)
     {
-        \PHPUnit_Framework_Assert::assertArrayNotHasKey($key, $this->containerParameters);
+        Assert::assertArrayNotHasKey($key, $this->containerParameters);
     }
 
     /**
@@ -60,7 +66,7 @@ public function thereShouldNotBeParameter($key)
      */
     public function itShouldBeSetToValue($val)
     {
-        \PHPUnit_Framework_Assert::assertSame($val, $this->containerParameters[$this->parameterKey]);
+        Assert::assertSame($val, $this->containerParameters[$this->parameterKey]);
     }
 
     /**
@@ -68,7 +74,7 @@ public function itShouldBeSetToValue($val)
      */
     public function theValueShouldBeAnArray()
     {
-        \PHPUnit_Framework_Assert::assertInternalType('array', $this->containerParameters[$this->parameterKey]);
+        Assert::assertInternalType('array', $this->containerParameters[$this->parameterKey]);
     }
 
     /**
@@ -78,7 +84,7 @@ public function theValueShouldBeAnArray()
     public function theArrayShouldContainOnlyTheValues($arg)
     {
         $values = explode(',', $arg);
-        
-        \PHPUnit_Framework_Assert::assertSame($values, $this->containerParameters[$this->parameterKey]);
+
+        Assert::assertSame($values, $this->containerParameters[$this->parameterKey]);
     }
 }