System.Json is not a dependency

Yavsc.Abstract/project.json

@@ -32,8 +32,7 @@
     "frameworks": {
         "net451": {
             "frameworkAssemblies": {
-                "System.ComponentModel.DataAnnotations": "4.0.0",
-                "System.Json": "4.0.0"
+                "System.ComponentModel.DataAnnotations": "4.0.0"
             }
         }
     }

Yavsc.Abstract/project.lock.json

@@ -67,8 +67,7 @@
       "Newtonsoft.Json >= 9.0.1"
     ],
     ".NETFramework,Version=v4.5.1": [
-      "fx/System.ComponentModel.DataAnnotations >= 4.0.0",
-      "fx/System.Json >= 4.0.0"
+      "fx/System.ComponentModel.DataAnnotations >= 4.0.0"
     ]
   }
 }