diff --git a/src/Microsoft.AspNet.Mvc.ModelBinding/project.json b/src/Microsoft.AspNet.Mvc.ModelBinding/project.json
index 5c1718a2b9..df57c339a7 100644
--- a/src/Microsoft.AspNet.Mvc.ModelBinding/project.json
+++ b/src/Microsoft.AspNet.Mvc.ModelBinding/project.json
@@ -20,7 +20,7 @@
     },
     "aspnetcore50": {
       "dependencies": {
-        "System.Collections.Concurrent": "4.0.0-beta-*",
+        "System.Collections.Concurrent": "4.0.10-beta-*",
         "System.ComponentModel.TypeConverter": "4.0.0-beta-*",
         "System.Diagnostics.Contracts": "4.0.0-beta-*",
         "System.Reflection.TypeExtensions": "4.0.0-beta-*",
diff --git a/src/Microsoft.AspNet.Mvc.Razor.Host/project.json b/src/Microsoft.AspNet.Mvc.Razor.Host/project.json
index f6a1de3585..882f4c5c13 100644
--- a/src/Microsoft.AspNet.Mvc.Razor.Host/project.json
+++ b/src/Microsoft.AspNet.Mvc.Razor.Host/project.json
@@ -17,7 +17,7 @@
         },
         "aspnetcore50": {
             "dependencies": {
-                "System.Collections.Concurrent": "4.0.0-beta-*",
+                "System.Collections.Concurrent": "4.0.10-beta-*",
                 "System.Diagnostics.Contracts": "4.0.0-beta-*",
                 "Microsoft.Framework.Runtime.Interfaces": { "version": "1.0.0-*", "type": "build" }
             }