diff --git a/composer.lock b/composer.lock
index 95a7c2db5..e2a1c6b6f 100644
--- a/composer.lock
+++ b/composer.lock
@@ -68,8 +68,8 @@
             "description": "JSON Linter",
             "keywords": [
                 "json",
-                "parser",
                 "linter",
+                "parser",
                 "validator"
             ]
         },
@@ -80,22 +80,22 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/Console",
-                "reference": "v2.2.0-BETA1"
+                "reference": "f65e34d058f0990a724f78e8d091dc0a20e439ac"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://github.com/symfony/Console/archive/v2.2.0-BETA1.zip",
-                "reference": "v2.2.0-BETA1",
+                "url": "https://api.github.com/repos/symfony/Console/zipball/f65e34d058f0990a724f78e8d091dc0a20e439ac",
+                "reference": "f65e34d058f0990a724f78e8d091dc0a20e439ac",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.3.3"
             },
-            "time": "2013-01-08 18:17:41",
+            "time": "2013-01-31 21:39:01",
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.2-dev"
+                    "dev-master": "2.3-dev"
                 }
             },
             "autoload": {
@@ -122,23 +122,23 @@
         },
         {
             "name": "symfony/finder",
-            "version": "v2.1.6",
+            "version": "v2.1.7",
             "target-dir": "Symfony/Component/Finder",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/Finder",
-                "reference": "v2.1.6"
+                "reference": "v2.1.7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://github.com/symfony/Finder/archive/v2.1.6.zip",
-                "reference": "v2.1.6",
+                "url": "https://github.com/symfony/Finder/archive/v2.1.7.zip",
+                "reference": "v2.1.7",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.3.3"
             },
-            "time": "2012-12-10 12:46:54",
+            "time": "2013-01-09 08:51:07",
             "type": "library",
             "autoload": {
                 "psr-0": {
@@ -169,22 +169,22 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/Process",
-                "reference": "v2.2.0-BETA1"
+                "reference": "c99475d555934461f079521d024d88a0d4e861eb"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://github.com/symfony/Process/archive/v2.2.0-BETA1.zip",
-                "reference": "v2.2.0-BETA1",
+                "url": "https://api.github.com/repos/symfony/Process/zipball/c99475d555934461f079521d024d88a0d4e861eb",
+                "reference": "c99475d555934461f079521d024d88a0d4e861eb",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.3.3"
             },
-            "time": "2013-01-05 18:24:35",
+            "time": "2013-01-31 21:39:01",
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.2-dev"
+                    "dev-master": "2.3-dev"
                 }
             },
             "autoload": {
@@ -228,8 +228,8 @@
             "require": {
                 "php": ">=5.3.3",
                 "phpunit/php-file-iterator": ">=1.3.0@stable",
-                "phpunit/php-token-stream": ">=1.1.3@stable",
-                "phpunit/php-text-template": ">=1.1.1@stable"
+                "phpunit/php-text-template": ">=1.1.1@stable",
+                "phpunit/php-token-stream": ">=1.1.3@stable"
             },
             "suggest": {
                 "ext-dom": "*",
@@ -259,8 +259,8 @@
             "description": "Library that provides collection, processing, and rendering functionality for PHP code coverage information.",
             "homepage": "https://github.com/sebastianbergmann/php-code-coverage",
             "keywords": [
-                "testing",
                 "coverage",
+                "testing",
                 "xunit"
             ]
         },
@@ -444,38 +444,38 @@
         },
         {
             "name": "phpunit/phpunit",
-            "version": "3.7.12",
+            "version": "3.7.13",
             "source": {
                 "type": "git",
                 "url": "git://github.com/sebastianbergmann/phpunit.git",
-                "reference": "3.7.12"
+                "reference": "3.7.13"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://github.com/sebastianbergmann/phpunit/archive/3.7.12.zip",
-                "reference": "3.7.12",
+                "url": "https://github.com/sebastianbergmann/phpunit/archive/3.7.13.zip",
+                "reference": "3.7.13",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.3",
-                "phpunit/php-file-iterator": ">=1.3.1",
-                "phpunit/php-text-template": ">=1.1.1",
-                "phpunit/php-code-coverage": ">=1.2.1",
-                "phpunit/php-timer": ">=1.0.2",
-                "phpunit/phpunit-mock-objects": ">=1.2.0,<1.3.0",
-                "symfony/yaml": ">=2.1.0,<2.2.0",
                 "ext-dom": "*",
                 "ext-pcre": "*",
                 "ext-reflection": "*",
-                "ext-spl": "*"
+                "ext-spl": "*",
+                "php": ">=5.3.3",
+                "phpunit/php-code-coverage": ">=1.2.1",
+                "phpunit/php-file-iterator": ">=1.3.1",
+                "phpunit/php-text-template": ">=1.1.1",
+                "phpunit/php-timer": ">=1.0.2",
+                "phpunit/phpunit-mock-objects": ">=1.2.0,<1.3.0",
+                "symfony/yaml": ">=2.1.0,<2.2.0"
             },
             "suggest": {
-                "phpunit/php-invoker": ">=1.1.0",
                 "ext-json": "*",
                 "ext-simplexml": "*",
-                "ext-tokenizer": "*"
+                "ext-tokenizer": "*",
+                "phpunit/php-invoker": ">=1.1.0"
             },
-            "time": "2013-01-09 22:41:02",
+            "time": "2013-01-13 10:21:19",
             "bin": [
                 "composer/bin/phpunit"
             ],
@@ -508,23 +508,23 @@
             "description": "The PHP Unit Testing framework.",
             "homepage": "http://www.phpunit.de/",
             "keywords": [
-                "testing",
                 "phpunit",
+                "testing",
                 "xunit"
             ]
         },
         {
             "name": "phpunit/phpunit-mock-objects",
-            "version": "1.2.2",
+            "version": "1.2.3",
             "source": {
                 "type": "git",
                 "url": "git://github.com/sebastianbergmann/phpunit-mock-objects.git",
-                "reference": "1.2.2"
+                "reference": "1.2.3"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://github.com/sebastianbergmann/phpunit-mock-objects/archive/1.2.2.zip",
-                "reference": "1.2.2",
+                "url": "https://github.com/sebastianbergmann/phpunit-mock-objects/archive/1.2.3.zip",
+                "reference": "1.2.3",
                 "shasum": ""
             },
             "require": {
@@ -534,7 +534,7 @@
             "suggest": {
                 "ext-soap": "*"
             },
-            "time": "2012-11-05 10:39:13",
+            "time": "2013-01-13 10:24:48",
             "type": "library",
             "autoload": {
                 "classmap": [
@@ -564,23 +564,23 @@
         },
         {
             "name": "symfony/yaml",
-            "version": "v2.1.6",
+            "version": "v2.1.7",
             "target-dir": "Symfony/Component/Yaml",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/Yaml",
-                "reference": "v2.1.6"
+                "reference": "v2.1.7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://github.com/symfony/Yaml/archive/v2.1.6.zip",
-                "reference": "v2.1.6",
+                "url": "https://api.github.com/repos/symfony/Yaml/zipball/v2.1.7",
+                "reference": "v2.1.7",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.3.3"
             },
-            "time": "2012-12-06 10:00:55",
+            "time": "2013-01-17 21:21:51",
             "type": "library",
             "autoload": {
                 "psr-0": {
diff --git a/src/Composer/Package/Version/VersionParser.php b/src/Composer/Package/Version/VersionParser.php
index 8d0d4d0f2..fbedc9e33 100644
--- a/src/Composer/Package/Version/VersionParser.php
+++ b/src/Composer/Package/Version/VersionParser.php
@@ -256,7 +256,7 @@ class VersionParser
             return array();
         }
 
-        if (preg_match('{^~(\d+)(?:\.(\d+))?(?:\.(\d+))?(?:\.(\d+))?'.self::$modifierRegex.'?$}', $constraint, $matches)) {
+        if (preg_match('{^~(\d+)(?:\.(\d+))?(?:\.(\d+))?(?:\.(\d+))?'.self::$modifierRegex.'?$}i', $constraint, $matches)) {
             if (isset($matches[4]) && '' !== $matches[4]) {
                 $highVersion = $matches[1] . '.' . $matches[2] . '.' . ($matches[3] + 1) . '.0-dev';
                 $lowVersion = $matches[1] . '.' . $matches[2] . '.' . $matches[3]. '.' . $matches[4];
diff --git a/tests/Composer/Test/Package/Version/VersionParserTest.php b/tests/Composer/Test/Package/Version/VersionParserTest.php
index c115a4e22..d62a8df5c 100644
--- a/tests/Composer/Test/Package/Version/VersionParserTest.php
+++ b/tests/Composer/Test/Package/Version/VersionParserTest.php
@@ -265,6 +265,7 @@ class VersionParserTest extends \PHPUnit_Framework_TestCase
             array('~1.2.3.4', new VersionConstraint('>=', '1.2.3.4'), new VersionConstraint('<', '1.2.4.0-dev')),
             array('~1.2-beta',new VersionConstraint('>=', '1.2.0.0-beta'), new VersionConstraint('<', '2.0.0.0-dev')),
             array('~1.2-b2',  new VersionConstraint('>=', '1.2.0.0-beta2'), new VersionConstraint('<', '2.0.0.0-dev')),
+            array('~1.2-BETA2', new VersionConstraint('>=', '1.2.0.0-beta2'), new VersionConstraint('<', '2.0.0.0-dev')),
             array('~1.2.2-dev', new VersionConstraint('>=', '1.2.2.0-dev'), new VersionConstraint('<', '1.3.0.0-dev')),
         );
     }