diff --git a/composer.json b/composer.json
index 1689b35..d93d8a7 100644
--- a/composer.json
+++ b/composer.json
@@ -13,11 +13,11 @@
   "require": {
     "php": "^7.0",
     "respect/validation": "^1.1",
-    "symfony/options-resolver": "^3.4"
+    "symfony/options-resolver": "^3.3"
   },
   "require-dev": {
     "phpunit/phpunit": "^6.4",
-    "symfony/var-dumper": "^3.4"
+    "symfony/var-dumper": "^3.3"
   },
   "autoload": {
     "psr-4": {
diff --git a/composer.lock b/composer.lock
index 6aef9ed..15b4bdf 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "8d346e6b5be070f5cd7da59ceeb397ef",
+    "content-hash": "a68b8d2f07f7a575bbc75a37802ea6c8",
     "packages": [
         {
             "name": "respect/validation",
@@ -186,7 +186,7 @@
     "packages-dev": [
         {
             "name": "doctrine/instantiator",
-            "version": "1.0.5",
+            "version": "1.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/instantiator.git",
@@ -539,16 +539,16 @@
         },
         {
             "name": "phpspec/prophecy",
-            "version": "1.7.3",
+            "version": "1.7.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "e4ed002c67da8eceb0eb8ddb8b3847bb53c5c2bf"
+                "reference": "9f901e29c93dae4aa77c0bb161df4276f9c9a1be"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/e4ed002c67da8eceb0eb8ddb8b3847bb53c5c2bf",
-                "reference": "e4ed002c67da8eceb0eb8ddb8b3847bb53c5c2bf",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/9f901e29c93dae4aa77c0bb161df4276f9c9a1be",
+                "reference": "9f901e29c93dae4aa77c0bb161df4276f9c9a1be",
                 "shasum": ""
             },
             "require": {
@@ -560,7 +560,7 @@
             },
             "require-dev": {
                 "phpspec/phpspec": "^2.5|^3.2",
-                "phpunit/phpunit": "^4.8.35 || ^5.7"
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5"
             },
             "type": "library",
             "extra": {
@@ -598,7 +598,7 @@
                 "spy",
                 "stub"
             ],
-            "time": "2017-11-24T13:59:53+00:00"
+            "time": "2018-02-11T18:49:29+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
diff --git a/tests/FlexValidatorTest.php b/tests/FlexValidatorTest.php
index 76bb74a..384fbe9 100644
--- a/tests/FlexValidatorTest.php
+++ b/tests/FlexValidatorTest.php
@@ -443,7 +443,7 @@ public function validateWithSameRuleMultipleTimes()
 
         $rules = [
             'username' => [
-                'rules' => v::alpha('_')->alpha(','),
+                'rules' => v::allOf(v::alpha('_'), v::alpha(',')),
             ],
         ];