diff --git a/.travis.yml b/.travis.yml
index 89b4d38..1e54f88 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,8 +9,9 @@ php:
 
 env:
   matrix:
+    - COMPOSER_PREFER=""
     - COMPOSER_PREFER="--prefer-stable"
-    - COMPOSER_PREFER="--prefer-lowest"
+    - COMPOSER_PREFER="--prefer-stable --prefer-lowest"
 
 matrix:
   allow_failures:
diff --git a/composer.json b/composer.json
index 13a6bb9..d2a80b9 100644
--- a/composer.json
+++ b/composer.json
@@ -9,6 +9,7 @@
             "email": "dev@verylastroom.com"
         }
     ],
+    "minimum-stability": "dev",
     "autoload": {
         "psr-4": { "Rezzza\\SymfonyRestApiJson\\": "src" }
     },
@@ -16,9 +17,9 @@
         "psr-4": { "Rezzza\\SymfonyRestApiJson\\Tests\\": "tests" }
     },
     "require": {
-        "symfony/http-kernel": "^2.8|^3.0",
-        "symfony/http-foundation": "^2.8|^3.0",
-        "symfony/debug": "^2.8|^3.0",
+        "symfony/http-kernel": "^2.8|^3.0|^4.0",
+        "symfony/http-foundation": "^2.8|^3.0|^4.0",
+        "symfony/debug": "^2.8|^3.0|^4.0",
         "jakeasmith/http_build_url": "^1.0",
         "justinrainbow/json-schema": ">=3.0 <6.0"
     },