diff --git a/composer.json b/composer.json
index 2f46c925d4..eaa471ad42 100644
--- a/composer.json
+++ b/composer.json
@@ -40,7 +40,7 @@
         {
             "type": "pear",
             "url": "https://pear.horde.org"
-        }
+		}
     ],
 	"config": {
 	},
@@ -64,6 +64,7 @@
 		"pear-pear.horde.org/horde_mapi": "^1.0.9",
 		"pear-pear.horde.org/horde_managesieve": "^1.0.2",
 		"pear-pear.horde.org/horde_crypt": "^2.7.9",
+		"pear-pear.horde.org/horde_text_diff": "^2.2",
 		"pear/pear": "*",
 		"pear/auth_sasl": "*",
 		"pear/xml_feed_parser": "^1.0.5",
@@ -74,6 +75,7 @@
 		"bower-asset/jquery-touchswipe": "1.6.*",
 		"bower-asset/jquery-ui":"=1.11.2",
 		"bower-asset/cropper":"2.3.*",
+		"bower-asset/diff2html": "^2.7",
 		"npm-asset/as-jqplot" : "1.0.*",
 		"npm-asset/gridster":"0.5.*",
 		"adldap2/adldap2": "=4.0.4",
@@ -103,5 +105,7 @@
 		"installer-paths": {
 			"{$name}/": ["type:egroupware-app"]
 		}
-	}
+	},
+    "minimum-stability": "dev",
+    "prefer-stable": true
 }