diff --git a/.travis.yml b/.travis.yml
index db1575d..722a775 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -22,6 +22,8 @@ matrix:
       env: LARAVEL='5.7.*' TESTBENCH='3.7.*'
     - php: 7.2
       env: LARAVEL='5.8.*' TESTBENCH='3.8.*'
+    - php: 7.2
+      env: LARAVEL='6.0.*' TESTBENCH='3.9.*'
     - php: 7.3
       env: LARAVEL='5.5.*' TESTBENCH='3.5.*'
     - php: 7.3
@@ -30,6 +32,8 @@ matrix:
       env: LARAVEL='5.7.*' TESTBENCH='3.7.*'
     - php: 7.3
       env: LARAVEL='5.8.*' TESTBENCH='3.8.*'
+    - php: 7.3
+      env: LARAVEL='6.0.*' TESTBENCH='3.9.*'
   fast_finish: true
 
 cache:
diff --git a/composer.json b/composer.json
index fed199a..8caa212 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,7 @@
         "illuminate/validation": "5.5.* || 5.6.* || 5.7.* || 5.8.* || ^6.0"
     },
     "require-dev": {
-        "orchestra/testbench": "3.5.* || 3.6.* || 3.7.* || 3.8.*",
+        "orchestra/testbench": "3.5.* || 3.6.* || 3.7.* || 3.8.* || 3.9.*",
         "phpunit/phpunit": "^6.0 || ^7.0 || ^8.0"
     },
     "config": {
@@ -51,6 +51,8 @@
             "Mvdnbrk\\Gtin\\Tests\\": "tests"
         }
     },
+    "minimum-stability": "dev",
+    "prefer-stable": true,
     "scripts": {
         "test": "vendor/bin/phpunit"
     }