diff --git a/README.md b/README.md
index be7fafd..6b47a35 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ PHP >= 5.4
 
 ### Install
 
-The package can be installed using [ Composer ](https://getcomposer.org/). (not yet)
+The package can be installed using [ Composer ](https://getcomposer.org/).
 ```
 composer require meta-tech/pws-auth
 ```
@@ -47,7 +47,7 @@ Or add the package to your `composer.json`.
 
 ```
 "require": {
-    "meta-tech/pws-auth" : "1.0"
+    "meta-tech/pws-auth" : "@dev"
 }
 ```
 
diff --git a/composer.json b/composer.json
index ffa3ea2..2f46b61 100644
--- a/composer.json
+++ b/composer.json
@@ -17,6 +17,7 @@
         }
     },
     "require"       : {
-        "symfony/yaml": "^3.2"
+        "php" : ">=5.4",
+        "symfony/yaml" : "^3.2"
     }
 }