diff --git a/Yavsc.Abstract/project.json b/Yavsc.Abstract/project.json
index a7d028b3..37a9174e 100644
--- a/Yavsc.Abstract/project.json
+++ b/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"
             }
         }
     }
diff --git a/Yavsc.Abstract/project.lock.json b/Yavsc.Abstract/project.lock.json
index 5a5800ef..df2d46db 100644
--- a/Yavsc.Abstract/project.lock.json
+++ b/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"
     ]
   }
 }
\ No newline at end of file