diff --git a/composer.json b/composer.json
index 061b310..d3a33d8 100644
--- a/composer.json
+++ b/composer.json
@@ -37,7 +37,7 @@
     },
     "require-dev": {
         "ext-mcrypt": "*",
-        "mikey179/vfsStream": "dev-master",
+        "mikey179/vfsStream": "~1.0",
         "symfony/filesystem": "~2.0",
         "symfony/process": "~2.3"
     },
diff --git a/src/BeSimple/SoapClient/composer.json b/src/BeSimple/SoapClient/composer.json
index 9b1b7ab..8687ce5 100644
--- a/src/BeSimple/SoapClient/composer.json
+++ b/src/BeSimple/SoapClient/composer.json
@@ -27,7 +27,7 @@
         "ass/xmlsecurity": "~1.0"
     },
     "require-dev": {
-        "mikey179/vfsStream": "dev-master",
+        "mikey179/vfsStream": "~1.0",
         "symfony/filesystem": "~2.0",
         "symfony/process": "~2.3"
     },
diff --git a/src/BeSimple/SoapCommon/composer.json b/src/BeSimple/SoapCommon/composer.json
index 17386ae..bf1ec6d 100644
--- a/src/BeSimple/SoapCommon/composer.json
+++ b/src/BeSimple/SoapCommon/composer.json
@@ -26,7 +26,7 @@
     },
     "require-dev": {
         "ext-mcrypt": "*",
-        "mikey179/vfsStream": "dev-master"
+        "mikey179/vfsStream": "~1.0"
     },
     "autoload": {
         "psr-0": { "BeSimple\\SoapCommon": "" }