diff --git a/src/Microsoft.AspNet.Razor/project.json b/src/Microsoft.AspNet.Razor/project.json
index 2c9965ddf8..43284e0cfa 100644
--- a/src/Microsoft.AspNet.Razor/project.json
+++ b/src/Microsoft.AspNet.Razor/project.json
@@ -9,12 +9,13 @@
                 "System.Collections": "4.0.10-beta-*",
                 "System.Diagnostics.Debug": "4.0.10-beta-*",
                 "System.Diagnostics.Tools": "4.0.0-beta-*",
+                "System.IO": "4.0.10-beta-*",
                 "System.IO.FileSystem": "4.0.0-beta-*",
                 "System.Linq": "4.0.0-beta-*",
                 "System.Reflection": "4.0.10-beta-*",
                 "System.Resources.ResourceManager": "4.0.0-beta-*",
                 "System.Runtime.Extensions": "4.0.10-beta-*",
-                "System.Threading": "4.0.0-beta-*",
+                "System.Threading": "4.0.10-beta-*",
                 "System.Threading.Tasks": "4.0.10-beta-*",
                 "System.Threading.Thread": "4.0.0-beta-*",
                 "System.Security.Cryptography.Hashing.Algorithms": "4.0.0-beta-*"