diff --git a/src/Microsoft.AspNet.Cors.Core/project.json b/src/Microsoft.AspNet.Cors.Core/project.json
index c9551fc701..dbbc14ee5d 100644
--- a/src/Microsoft.AspNet.Cors.Core/project.json
+++ b/src/Microsoft.AspNet.Cors.Core/project.json
@@ -19,8 +19,8 @@
         },
         "dnxcore50" : { 
             "dependencies": {
-                "System.Runtime": "4.0.20-beta-*"
+                "System.Runtime": "4.0.21-beta-*"
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/Microsoft.AspNet.Cors/project.json b/src/Microsoft.AspNet.Cors/project.json
index 60fac13b7d..035a2dfb88 100644
--- a/src/Microsoft.AspNet.Cors/project.json
+++ b/src/Microsoft.AspNet.Cors/project.json
@@ -1,4 +1,4 @@
-{
+{
     "version": "1.0.0-*",
     "repository": {
         "type": "git",
@@ -18,7 +18,7 @@
         },
         "dnxcore50" : { 
             "dependencies": {
-                "System.Runtime": "4.0.20-beta-*"
+                "System.Runtime": "4.0.21-beta-*"
             }
         }
     }