Fixes #2461

Author: Anton Evers

composer.json

@@ -43,7 +43,7 @@
         "monolog/monolog": "^1.17",
         "oyejorge/less.php": "~1.7.0",
         "pelago/emogrifier": "0.1.1",
-        "tubalmartin/cssmin": "2.4.8-p4",
+        "tubalmartin/cssmin": "2.4.8-p6",
         "magento/magento-composer-installer": ">=0.1.11",
         "braintree/braintree_php": "3.7.0",
         "symfony/console": "~2.3, !=2.7.0",

dev/tests/integration/testsuite/Magento/Framework/Composer/_files/testFromClone/composer.json

@@ -34,7 +34,7 @@
         "composer/composer": "1.0.0-alpha9",
         "monolog/monolog": "1.11.0",
         "oyejorge/less.php": "1.7.0.3",
-        "tubalmartin/cssmin": "2.4.8-p4",
+        "tubalmartin/cssmin": "2.4.8-p6",
         "magento/magento-composer-installer": "*",
         "phpseclib/phpseclib": "~0.3",
         "symfony/console": "~2.3",