diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..b93029b
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,4 @@
+/.gitattributes export-ignore
+/.gitignore export-ignore
+/.travis.yml export-ignore
+/phpcs.xml export-ignore
diff --git a/.travis.yml b/.travis.yml
index e4c6453..dc20b50 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,41 +1,54 @@
-sudo: false
+dist: xenial
 
 language: php
 
+stages:
+  - name: "Lint"
+  - name: "PHP Unit tests"
+
 cache:
   directories:
-    - $HOME/.composer/cache
-    - $HOME/.local
-    - vendor
-
-matrix:
-  fast_finish: true
-  include:
-    - php: 7.1
-      env:
-        - EXECUTE_CS_CHECK=true
-        - EXECUTE_TEST_COVERALLS=true
-        - PATH="$HOME/.local/bin:$PATH"
-    - php: nightly
-  allow_failures:
-    - php: nightly
-
-before_install:
-  - if [[ $EXECUTE_TEST_COVERALLS != 'true' ]]; then phpenv config-rm xdebug.ini || return 0 ; fi
-  - composer self-update
-  - if [[ $EXECUTE_TEST_COVERALLS == 'true' ]]; then composer require --dev --no-update satooshi/php-coveralls:dev-master ; fi
+    - $HOME/.composer/cache/
 
 install:
-  - travis_retry composer install --no-interaction
-  - composer info -i
+  - composer install --no-interaction
 
 script:
-  - if [[ $EXECUTE_TEST_COVERALLS == 'true' ]]; then vendor/bin/phpunit --coverage-clover clover.xml ; fi
-  - if [[ $EXECUTE_TEST_COVERALLS != 'true' ]]; then vendor/bin/phpunit ; fi
-  - if [[ $EXECUTE_CS_CHECK == 'true' ]]; then vendor/bin/phpcs ; fi
+  - ./vendor/bin/phpunit --coverage-clover clover.xml
+
+after_success:
+  - wget https://github.com/php-coveralls/php-coveralls/releases/download/v2.2.0/php-coveralls.phar
+  - chmod +x php-coveralls.phar
+  - php php-coveralls.phar -vvv
+
+jobs:
+  allow_failures:
+    - php: nightly
 
-after_script:
-  - if [[ $EXECUTE_TEST_COVERALLS == 'true' ]]; then vendor/bin/coveralls ; fi
+  include:
+    - stage: "Lint"
+      name: "Lint files"
+      before_install: phpenv config-rm xdebug.ini
+      after_success: skip
+      script: ./vendor/bin/phpcs
+
+    - stage: "PHP Unit tests"
+      php: 7.1
+      name: "PHP 7.1"
+    - stage: "PHP Unit tests"
+      php: 7.2
+      name: "PHP 7.2"
+    - stage: "PHP Unit tests"
+      php: 7.3
+      name: "PHP 7.3"
+    - stage: "PHP Unit tests"
+      php: 7.4
+      name: "PHP 7.4"
+    - stage: "PHP Unit tests"
+      php: nightly
+      name: "PHP nightly"
+      install:
+        - composer install --no-interaction --ignore-platform-reqs
 
 notifications:
   email: true
diff --git a/composer.json b/composer.json
index 41184d3..b3d745a 100644
--- a/composer.json
+++ b/composer.json
@@ -5,8 +5,9 @@
     "authors": [
         {
             "name": "Ben Scholzen 'DASPRiD'",
+            "email": "mail@dasprids.de",
             "homepage": "https://dasprids.de/",
-            "email": "mail@dasprids.de"
+            "role": "Developer"
         }
     ],
     "keywords": [
@@ -14,8 +15,8 @@
         "map"
     ],
     "require-dev": {
-        "phpunit/phpunit": "^6.4",
-        "squizlabs/php_codesniffer": "^3.1"
+        "phpunit/phpunit": "^7 | ^8 | ^9",
+        "squizlabs/php_codesniffer": "^3.4"
     },
     "autoload": {
         "psr-4": {
diff --git a/test/AbstractEnumTest.php b/test/AbstractEnumTest.php
index ddba7d3..58ca913 100644
--- a/test/AbstractEnumTest.php
+++ b/test/AbstractEnumTest.php
@@ -14,7 +14,7 @@
 
 final class AbstractEnumTest extends TestCase
 {
-    public function setUp()
+    public function setUp(): void
     {
         $reflectionClass = new ReflectionClass(AbstractEnum::class);