diff --git a/.travis.yml b/.travis.yml
index 24c2d6c..ddfd84f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,15 +4,42 @@ php:
   - 7.1
   - 7.2
   - 7.3
+  - 7.4
 
 env:
-  matrix:
-    - COMPOSER_FLAGS="--prefer-lowest"
-    - COMPOSER_FLAGS=""
+  - LARAVEL="^5.5" COMPOSER_FLAGS="--prefer-lowest"
+  - LARAVEL="^5.5" COMPOSER_FLAGS=""
+  - LARAVEL="^6.0" COMPOSER_FLAGS="--prefer-lowest"
+  - LARAVEL="^6.0" COMPOSER_FLAGS=""
+  - LARAVEL="^7.0" COMPOSER_FLAGS="--prefer-lowest"
+  - LARAVEL="^7.0" COMPOSER_FLAGS=""
 
-before_script:
-  - travis_retry composer self-update
-  - travis_retry composer update ${COMPOSER_FLAGS} --no-interaction --prefer-source
+matrix:
+  exclude:
+    - php: 7.1
+      env: LARAVEL="^6.0" COMPOSER_FLAGS="--prefer-lowest"
+    - php: 7.1
+      env: LARAVEL="^6.0" COMPOSER_FLAGS=""
+    - php: 7.1
+      env: LARAVEL="^7.0" COMPOSER_FLAGS="--prefer-lowest"
+    - php: 7.1
+      env: LARAVEL="^7.0" COMPOSER_FLAGS=""
+  allow_failures:
+    - php: 7.4
+      env: LARAVEL="^5.5" COMPOSER_FLAGS="--prefer-lowest"
+    - php: 7.4
+      env: LARAVEL="^6.0" COMPOSER_FLAGS="--prefer-lowest"
+
+cache:
+  directories:
+    - $HOME/.composer/cache/files
+
+before_install:
+  - echo "memory_limit=2G" >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
+
+install:
+  - travis_retry composer require laravel/framework:${LARAVEL} --no-interaction --prefer-dist
+  - travis_retry composer update ${COMPOSER_FLAGS} --no-interaction --prefer-dist
 
 script:
   - vendor/bin/phpunit --coverage-text --coverage-clover=coverage.clover
diff --git a/composer.json b/composer.json
index a68a093..9db0a09 100644
--- a/composer.json
+++ b/composer.json
@@ -17,11 +17,11 @@
     ],
     "require": {
         "php": "^7.1",
-        "illuminate/support": "^5.5|^6"
+        "illuminate/support": "^5.5 || ^6.0 || ^7.0"
     },
     "require-dev": {
-        "orchestra/testbench": "3.6.*",
-        "phpunit/phpunit": "^7.0"
+        "orchestra/testbench": "^3.0 || ^4.0 || ^5.0",
+        "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/tests/TestCase.php b/tests/TestCase.php
index 6f669c4..b981a0a 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -12,7 +12,7 @@ abstract class TestCase extends \Orchestra\Testbench\TestCase
 {
     protected static $setUpRun = false;
 
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
 
@@ -79,4 +79,4 @@ protected function setUpDatabase()
             $table->morphs('commentable');
         });
     }
-}
\ No newline at end of file
+}