diff --git a/composer.json b/composer.json
index 9ed126a9ccade9c324bf516f6848d98a70ab4e4c..86bedd94f4b9ec0fc4e25a7fbeccb82e789054e9 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,7 @@
 		"pear-pear.horde.org/Horde_Text_Flowed": "^2.0.3@stable",
 		"pear-pear.horde.org/Horde_Util": "^2.5.8@stable",
 		"pear-pear.horde.org/Horde_Smtp": "^1.9.5@stable",
-		"cerdic/css-tidy": "v1.5.5",
+		"cerdic/css-tidy": "v1.5.6",
 		"ezyang/htmlpurifier": "4.9.3",
 		"kwi/urllinker": "dev-default",
 		"gravatarphp/gravatar": "^1.0",
diff --git a/composer.lock b/composer.lock
index 58fe9e12d525c899187e100033f4186890b17bb0..5248d26c06c2f085ec82158239b0e784c2de62f5 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": "914f49867773d167a317beb72ece8ad6",
+    "content-hash": "221d98db37a5e831353a88d64076f731",
     "packages": [
         {
             "name": "arthurhoaro/favicon",
@@ -58,16 +58,16 @@
         },
         {
             "name": "cerdic/css-tidy",
-            "version": "v1.5.5",
+            "version": "v1.5.6",
             "source": {
                 "type": "git",
                 "url": "https://github.com/Cerdic/CSSTidy.git",
-                "reference": "b0c1bda3be5a35da44ba1ac28cc61c67d2ada465"
+                "reference": "d4443352da925610919f1b49c5f6bb68216b6b60"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/Cerdic/CSSTidy/zipball/b0c1bda3be5a35da44ba1ac28cc61c67d2ada465",
-                "reference": "b0c1bda3be5a35da44ba1ac28cc61c67d2ada465",
+                "url": "https://api.github.com/repos/Cerdic/CSSTidy/zipball/d4443352da925610919f1b49c5f6bb68216b6b60",
+                "reference": "d4443352da925610919f1b49c5f6bb68216b6b60",
                 "shasum": ""
             },
             "type": "library",
@@ -87,7 +87,7 @@
                 }
             ],
             "description": "CSSTidy is a CSS minifier",
-            "time": "2015-11-28T21:47:43+00:00"
+            "time": "2017-09-29T14:18:45+00:00"
         },
         {
             "name": "ezyang/htmlpurifier",
@@ -233,7 +233,7 @@
             ],
             "description": "Autolink URLs in text or html",
             "homepage": "http://www.kwi.dk/projects/php/UrlLinker/",
-            "time": "2014-12-28T22:05:00+00:00"
+            "time": "2014-12-28T23:05:00+00:00"
         },
         {
             "name": "pear-pear.horde.org/Horde_Crypt_Blowfish",
@@ -891,6 +891,7 @@
                 "shasum": ""
             },
             "type": "library",
+            "notification-url": "https://packagist.org/downloads/",
             "license": [
                 "AGPLv3"
             ],
@@ -901,9 +902,6 @@
                 }
             ],
             "description": "Composer package containing Nextcloud's public API (classes, interfaces)",
-            "support": {
-                "source": "https://github.com/ChristophWurst/nextcloud_composer/tree/master"
-            },
             "time": "2017-09-20T09:46:46+00:00"
         },
         {