diff --git a/.codeclimate.yml b/.codeclimate.yml
new file mode 100644
index 0000000..f02b096
--- /dev/null
+++ b/.codeclimate.yml
@@ -0,0 +1,30 @@
+version: "2"
+
+checks:
+  method-complexity:
+    config:
+      threshold: 9
+
+exclude_patterns:
+  - "config/"
+  - "db/"
+  - "dist/"
+  - "docs/"
+  - "features/"
+  - "**/node_modules/"
+  - "script/"
+  - "**/spec/"
+  - "**/test/"
+  - "**/tests/"
+  - "Tests/"
+  - "example.php"
+  - "examples/"
+  - "**/vendor/"
+  - "**/*_test.go"
+  - "**/*.d.ts"
+
+plugins:
+  phpcodesniffer:
+    enabled: true
+    config:
+      standard: "PSR2"
diff --git a/.github/workflows/push.yml b/.github/workflows/push.yml
new file mode 100644
index 0000000..f7a98f9
--- /dev/null
+++ b/.github/workflows/push.yml
@@ -0,0 +1,81 @@
+on: [push, pull_request]
+jobs:
+  before:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Prepare CodeClimate
+        env:
+          CC_TEST_REPORTER_ID: ${{ secrets.CC_TEST_REPORTER_ID }}
+        run: |
+          wget https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 -qO ./cc-test-reporter
+          chmod +x ./cc-test-reporter
+          ./cc-test-reporter before-build
+
+  unit-tests:
+    needs: [before]
+    strategy:
+      matrix:
+        include:
+          - image: 'iras/php7-composer:1'
+            php_version: 7.1
+          - image: 'iras/php7-composer:2'
+            php_version: 7.2
+          - image: 'iras/php7-composer:3'
+            php_version: 7.3
+          - image: 'iras/php7-composer:4'
+            php_version: 7.4
+          - image: 'iras/php8-composer:0'
+            php_version: 8.0
+    name: PHP Unit Tests on PHP ${{ matrix.php_version }}
+    runs-on: ubuntu-latest
+    container: ${{ matrix.image }}
+    steps:
+      - name: Container Setup
+        run: |
+          apk add --no-cache tar openssl
+          mkdir coverage
+          wget https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 -qO /usr/bin/cc-test-reporter
+          chmod +x /usr/bin/cc-test-reporter
+      - name: Checkout
+        run: |
+          git init && git remote add origin https://github.com/${{ github.repository }}.git
+          git fetch origin ${{ github.sha }} && git reset --hard ${{ github.sha }}
+      - uses: actions/cache@v2
+        with:
+          path: /composer/cache
+          key: composer-cache-7.${{ matrix.MINOR_VERSION }}
+      - name: Install dependencies
+        run: composer install --no-interaction --ansi
+      - name: Execute tests
+        run: |
+          php -dzend_extension=xdebug.so -dxdebug.mode=coverage vendor/bin/phpunit \
+            -c phpunit.xml \
+            --coverage-clover=coverage/clover.xml \
+            --coverage-text \
+            --color=always
+      - name: Format Coverage
+        run: |
+          cc-test-reporter format-coverage -t clover -o coverage/cc-${{ matrix.php_version }}.json coverage/clover.xml
+      - name: Store Coverage Result
+        uses: actions/upload-artifact@v3
+        with:
+          name: coverage-results
+          path: coverage/
+
+  after:
+    needs: [unit-tests]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Restore Coverage Result
+        uses: actions/download-artifact@v3
+        with:
+          name: coverage-results
+          path: coverage/
+      - name: Report Coverage
+        env:
+          CC_TEST_REPORTER_ID: ${{ secrets.CC_TEST_REPORTER_ID }}
+        run: |
+          wget https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 -qO ./cc-test-reporter
+          chmod +x ./cc-test-reporter
+          ./cc-test-reporter sum-coverage coverage/cc-*.json -p 5 -o coverage/cc-total.json
+          ./cc-test-reporter upload-coverage -i coverage/cc-total.json
diff --git a/.gitignore b/.gitignore
index c10ac6e..d3c5cfd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,5 +6,8 @@ composer.phar
 # ide settings
 /.idea*
 
+# phpunit result
+/.phpunit.result.cache
+
 # rendered documentation
 /docs/_site
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 495e31c..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,25 +0,0 @@
-language: php
-dist: trusty
-php:
-  - 7.0
-  - 7.1
-  - 7.2
-
-sudo: false
-
-cache:
-  directories:
-    - $HOME/.composer/cache
-
-matrix:
-  fast_finish: true
-
-before_script:
-  - composer install --no-interaction
-  - sh -c 'if [ "$TRAVIS_PHP_VERSION" = "7.1" ]; then composer require satooshi/php-coveralls:~0.6@stable; fi;'
-  - mkdir -p build/logs
-
-script:
-  - composer code-style
-  - vendor/bin/phpunit -c phpunit.xml --coverage-clover=build/logs/clover.xml --coverage-text
-  - sh -c 'if [ "$TRAVIS_PHP_VERSION" = "7.1" ]; then php vendor/bin/coveralls -v; fi;'
diff --git a/README.md b/README.md
index a49389f..1c7d53a 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,8 @@
 # tflori/verja
 
-[![Build Status](https://travis-ci.org/tflori/verja.svg?branch=master)](https://travis-ci.org/tflori/verja)
-[![Coverage Status](https://coveralls.io/repos/github/tflori/verja/badge.svg?branch=master)](https://coveralls.io/github/tflori/verja?branch=master)
+[![.github/workflows/push.yml](https://github.com/tflori/verja/actions/workflows/push.yml/badge.svg)](https://github.com/tflori/verja/actions/workflows/push.yml)
+[![Test Coverage](https://api.codeclimate.com/v1/badges/e07f4d5da0789699e27c/test_coverage)](https://codeclimate.com/github/tflori/verja/test_coverage)
+[![Maintainability](https://api.codeclimate.com/v1/badges/e07f4d5da0789699e27c/maintainability)](https://codeclimate.com/github/tflori/verja/maintainability)
 [![Latest Stable Version](https://poser.pugx.org/tflori/verja/v/stable.svg)](https://packagist.org/packages/tflori/verja) 
 [![Total Downloads](https://poser.pugx.org/tflori/verja/downloads.svg)](https://packagist.org/packages/tflori/verja) 
 [![License](https://poser.pugx.org/tflori/verja/license.svg)](https://packagist.org/packages/tflori/verja)
diff --git a/composer.json b/composer.json
index 9e90864..cb5bbde 100644
--- a/composer.json
+++ b/composer.json
@@ -3,15 +3,16 @@
   "description": "An validation tool for arrays filled by foreign input",
   "license": "MIT",
   "require": {
-    "php": "^7.0",
+    "php": "^7.0 || ^8.0",
     "ext-json": "*"
   },
   "require-dev": {
-    "phpunit/phpunit": "^6.0",
-    "mockery/mockery": "^0.9",
-    "squizlabs/php_codesniffer": "^2.7",
-    "tflori/dependency-injector": "^1.3",
-    "nesbot/carbon": "^1.23"
+    "phpunit/phpunit": "*",
+    "tflori/phpunit-printer": "*",
+    "mockery/mockery": "^1.1",
+    "squizlabs/php_codesniffer": "^3.5",
+    "tflori/dependency-injector": "^2.2",
+    "nesbot/carbon": "^2.53"
   },
   "autoload": {
     "psr-4": {
diff --git a/phpunit.xml b/phpunit.xml
index 3a97ae4..08eda2f 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -9,8 +9,7 @@
          convertWarningsToExceptions="true"
          processIsolation="false"
          stopOnFailure="false"
-         syntaxCheck="true"
-         printerClass="\Verja\Test\Printer">
+         printerClass="PhpUnitPrinter\TextPrinter">
     <testsuite name="tests">
         <directory>./tests/</directory>
     </testsuite>
diff --git a/tests/ErrorsTest.php b/tests/ErrorsTest.php
index 35f5252..a8f126c 100644
--- a/tests/ErrorsTest.php
+++ b/tests/ErrorsTest.php
@@ -43,9 +43,9 @@ public function errorsCanBeSerialized()
 
         $serialized = serialize($error);
 
-        self::assertContains('ERROR_KEY', $serialized);
-        self::assertContains('validated value', $serialized);
-        self::assertContains('Error message from validator', $serialized);
+        self::assertStringContainsString('ERROR_KEY', $serialized);
+        self::assertStringContainsString('validated value', $serialized);
+        self::assertStringContainsString('Error message from validator', $serialized);
     }
 
     /** @test */
diff --git a/tests/Field/ValidatorTest.php b/tests/Field/ValidatorTest.php
index 36d46bc..21a432a 100644
--- a/tests/Field/ValidatorTest.php
+++ b/tests/Field/ValidatorTest.php
@@ -2,7 +2,6 @@
 
 namespace Verja\Test\Field;
 
-use Mockery\Adapter\Phpunit\MockeryPHPUnitIntegration;
 use Verja\Field;
 use Verja\Gate;
 use Verja\Test\Examples\NotSerializable;
@@ -13,8 +12,6 @@
 
 class ValidatorTest extends TestCase
 {
-    use MockeryPHPUnitIntegration;
-
     /** @dataProvider provideValidatorsValueExpected
      * @param ValidatorInterface[] $validators
      * @param mixed $value
diff --git a/tests/Filter/DateTimeTest.php b/tests/Filter/DateTimeTest.php
index c884a59..306da86 100644
--- a/tests/Filter/DateTimeTest.php
+++ b/tests/Filter/DateTimeTest.php
@@ -9,7 +9,7 @@
 
 class DateTimeTest extends TestCase
 {
-    public static function setUpBeforeClass()
+    public static function setUpBeforeClass(): void
     {
         parent::setUpBeforeClass();
         date_default_timezone_set('Europe/Berlin');
diff --git a/tests/Filter/EscapeTest.php b/tests/Filter/EscapeTest.php
index b2c9e30..7b148e7 100644
--- a/tests/Filter/EscapeTest.php
+++ b/tests/Filter/EscapeTest.php
@@ -39,7 +39,7 @@ public function doesNotConvertNonStrings()
 
         $filtered = $filter->filter(42);
 
-        self::assertInternalType('integer', $filtered);
+        self::assertIsInt($filtered);
     }
 
     /** @dataProvider provideStringsWithHtmlEntities
diff --git a/tests/Filter/FromStringTest.php b/tests/Filter/FromStringTest.php
index a5074f2..258e531 100644
--- a/tests/Filter/FromStringTest.php
+++ b/tests/Filter/FromStringTest.php
@@ -9,7 +9,7 @@
 
 class FromStringTest extends TestCase
 {
-    protected function tearDown()
+    protected function tearDown(): void
     {
         parent::tearDown();
         Filter::resetNamespaces();
diff --git a/tests/Printer.php b/tests/Printer.php
deleted file mode 100644
index a2c8ca5..0000000
--- a/tests/Printer.php
+++ /dev/null
@@ -1,207 +0,0 @@
-<?php
-
-namespace Verja\Test;
-
-use PHPUnit\Framework\AssertionFailedError;
-use PHPUnit\Framework\Test;
-use PHPUnit\Framework\Warning;
-use PHPUnit\TextUI\ResultPrinter;
-
-class Printer extends ResultPrinter
-{
-
-    /**
-     * Replacement symbols for test statuses.
-     *
-     * @var array
-     */
-    protected static $symbols = [
-        'E' => "\e[31m!\e[0m", // red !
-        'F' => "\e[31m\xe2\x9c\x96\e[0m", // red X
-        'W' => "\e[33mW\e[0m", // yellow W
-        'I' => "\e[33mI\e[0m", // yellow I
-        'R' => "\e[33mR\e[0m", // yellow R
-        'S' => "\e[36mS\e[0m", // cyan S
-        '.' => "\e[32m\xe2\x9c\x94\e[0m", // green checkmark
-    ];
-    /**
-     * Structure of the outputted test row.
-     *
-     * @var string
-     */
-    protected $testRow = '';
-
-    /** @var string */
-    protected $previousClassName = '';
-
-    /**
-     * {@inheritdoc}
-     */
-    protected function writeProgress($progress)
-    {
-        if ($this->hasReplacementSymbol($progress)) {
-            $progress = static::$symbols[$progress];
-        }
-        $this->write("  {$progress} {$this->testRow}" . PHP_EOL);
-        $this->column++;
-        $this->numTestsRun++;
-    }
-    /**
-     * {@inheritdoc}
-     */
-    public function addError(Test $test, \Exception $e, $time)
-    {
-        $this->buildTestRow(get_class($test), $test->getName(), $time, 'fg-red');
-        parent::addError($test, $e, $time);
-    }
-    /**
-     * {@inheritdoc}
-     */
-    public function addFailure(Test $test, AssertionFailedError $e, $time)
-    {
-        $this->buildTestRow(get_class($test), $test->getName(), $time, 'fg-red');
-        parent::addFailure($test, $e, $time);
-    }
-    /**
-     * {@inheritdoc}
-     */
-    public function addWarning(Test $test, Warning $e, $time)
-    {
-        $this->buildTestRow(get_class($test), $test->getName(), $time, 'fg-yellow');
-        parent::addWarning($test, $e, $time);
-    }
-    /**
-     * {@inheritdoc}
-     */
-    public function addIncompleteTest(Test $test, \Exception $e, $time)
-    {
-        $this->buildTestRow(get_class($test), $test->getName(), $time, 'fg-yellow');
-        parent::addIncompleteTest($test, $e, $time);
-    }
-    /**
-     * {@inheritdoc}
-     */
-    public function addRiskyTest(Test $test, \Exception $e, $time)
-    {
-        $this->buildTestRow(get_class($test), $test->getName(), $time, 'fg-yellow');
-        parent::addRiskyTest($test, $e, $time);
-    }
-    /**
-     * {@inheritdoc}
-     */
-    public function addSkippedTest(Test $test, \Exception $e, $time)
-    {
-        $this->buildTestRow(get_class($test), $test->getName(), $time, 'fg-cyan');
-        parent::addSkippedTest($test, $e, $time);
-    }
-    /**
-     * {@inheritdoc}
-     */
-    public function endTest(Test $test, $time)
-    {
-        $testName = \PHPUnit\Util\Test::describe($test);
-        if ($this->hasCompoundClassName($testName)) {
-            list($className, $methodName) = explode('::', $testName);
-            $this->buildTestRow($className, $methodName, $time);
-        }
-        parent::endTest($test, $time);
-    }
-    /**
-     * {@inheritdoc}
-     *
-     * We'll handle the coloring ourselves.
-     */
-    protected function writeProgressWithColor($color, $buffer)
-    {
-        return $this->writeProgress($buffer);
-    }
-    /**
-     * Formats the results for a single test.
-     *
-     * @param $className
-     * @param $methodName
-     * @param $time
-     * @param $color
-     */
-    protected function buildTestRow($className, $methodName, $time, $color = 'fg-white')
-    {
-        if ($className != $this->previousClassName) {
-            $this->write(PHP_EOL . $this->formatWithColor('fg-magenta', $className) . PHP_EOL);
-            $this->previousClassName = $className;
-        }
-
-        $this->testRow = sprintf(
-            "(%s) %s",
-            $this->formatTestDuration($time),
-            $this->formatWithColor($color, "{$this->formatMethodName($methodName)}")
-        );
-    }
-    /**
-     * Makes the method name more readable.
-     *
-     * @param $method
-     * @return mixed
-     */
-    protected function formatMethodName($method)
-    {
-        return ucfirst(
-            $this->splitCamels(
-                $this->splitSnakes($method)
-            )
-        );
-    }
-    /**
-     * Replaces underscores in snake case with spaces.
-     *
-     * @param $name
-     * @return string
-     */
-    protected function splitSnakes($name)
-    {
-        return str_replace('_', ' ', $name);
-    }
-    /**
-     * Splits camel-cased names while handling caps sections properly.
-     *
-     * @param $name
-     * @return string
-     */
-    protected function splitCamels($name)
-    {
-        return preg_replace('/(?<=[a-z])(?=[A-Z])|(?<=[A-Z])(?=[A-Z][a-z])/', ' $1', $name);
-    }
-    /**
-     * Colours the duration if the test took longer than 500ms.
-     *
-     * @param $time
-     * @return string
-     */
-    protected function formatTestDuration($time)
-    {
-        $testDurationInMs = round($time * 1000);
-        $duration = $testDurationInMs > 500
-            ? $this->formatWithColor('fg-yellow', $testDurationInMs)
-            : $testDurationInMs;
-        return sprintf('%s ms', $duration);
-    }
-    /**
-     * Verifies if we have a replacement symbol available.
-     *
-     * @param $progress
-     * @return bool
-     */
-    protected function hasReplacementSymbol($progress)
-    {
-        return in_array($progress, array_keys(static::$symbols));
-    }
-    /**
-     * Checks if the class name is in format Class::method.
-     *
-     * @param $testName
-     * @return bool
-     */
-    protected function hasCompoundClassName($testName)
-    {
-        return ! empty($testName) && strpos($testName, '::') > -1;
-    }
-}
diff --git a/tests/TestCase.php b/tests/TestCase.php
index d874a70..420b0bd 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -2,35 +2,8 @@
 
 namespace Verja\Test;
 
-use Mockery\Adapter\Phpunit\MockeryPHPUnitIntegration;
+use Mockery\Adapter\Phpunit\MockeryTestCase;
 
-class TestCase extends \PHPUnit\Framework\TestCase
+class TestCase extends MockeryTestCase
 {
-    use MockeryPHPUnitIntegration;
-
-    /**
-     * Performs assertions shared by all tests of a test case. This method is
-     * called before execution of a test ends and before the tearDown method.
-     */
-    protected function assertPostConditions()
-    {
-        $this->addMockeryExpectationsToAssertionCount();
-        $this->closeMockery();
-
-        parent::assertPostConditions();
-    }
-
-    protected function addMockeryExpectationsToAssertionCount()
-    {
-        $container = \Mockery::getContainer();
-        if ($container != null) {
-            $count = $container->mockery_getExpectationCount();
-            $this->addToAssertionCount($count);
-        }
-    }
-
-    protected function closeMockery()
-    {
-        \Mockery::close();
-    }
 }
diff --git a/tests/Validator/FromStringTest.php b/tests/Validator/FromStringTest.php
index f361b66..de5fb66 100644
--- a/tests/Validator/FromStringTest.php
+++ b/tests/Validator/FromStringTest.php
@@ -9,7 +9,7 @@
 
 class FromStringTest extends TestCase
 {
-    protected function tearDown()
+    protected function tearDown(): void
     {
         parent::tearDown();
         Validator::resetNamespaces();
diff --git a/tests/Validator/UrlTest.php b/tests/Validator/UrlTest.php
index 47e6ae2..81a4bad 100644
--- a/tests/Validator/UrlTest.php
+++ b/tests/Validator/UrlTest.php
@@ -14,7 +14,7 @@ class UrlTest extends TestCase
     /** @var Helper|Mock */
     protected $helperMock;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
@@ -208,11 +208,10 @@ public function storesErrorWithoutListeningServer()
     public function provideInvalidUrls()
     {
         return [
-            [':'],
-            ['//'],
-            ['//example.com:65536'], // port out of range
-            ['//example.com:0'], // port out of range
-            ['//:'],
+            'only-colon' => [':'],
+            'only-slashes' => ['//'],
+            'port>65k' => ['//example.com:65536'], // port out of range
+            'no-port-and-host' => ['//:'],
         ];
     }