diff --git a/composer.json b/composer.json
index 6e6d31a..68ec96f 100644
--- a/composer.json
+++ b/composer.json
@@ -7,10 +7,10 @@
     "require": {
         "php": "~5.4",
         "nelmio/alice": "1.7.*",
-        "symfony/http-foundation": "2.6.*",
-        "symfony/http-kernel": "2.6.*",
-        "crell/api-problem": "1.7.*",
-        "doctrine/collections": "1.2.*"
+        "symfony/http-foundation": "~2.6",
+        "symfony/http-kernel": "~2.6",
+        "crell/api-problem": "~1.7",
+        "doctrine/collections": "~1.2"
     },
     "require-dev": {
         "phpunit/phpunit": "~4.5",
diff --git a/composer.lock b/composer.lock
index a90a601..28dd3c7 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at http://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "7d50e341d769c0768d25e34923696b10",
+    "hash": "353815e4e3e83751287a138c876a17ca",
     "packages": [
         {
             "name": "crell/api-problem",