diff --git a/src/Microsoft.AspNet.Server.Testing/project.json b/src/Microsoft.AspNet.Server.Testing/project.json
index e6af8b13d7..cfa8859965 100644
--- a/src/Microsoft.AspNet.Server.Testing/project.json
+++ b/src/Microsoft.AspNet.Server.Testing/project.json
@@ -30,7 +30,7 @@
         "System.IO.FileSystem": "4.0.1-*",
         "System.Net.Http": "4.0.1-*",
         "System.Net.Primitives": "4.0.11-*",
-        "System.Runtime.Extensions": "4.0.11-*",
+        "System.Runtime.Extensions": "4.1.0-*",
         "System.Text.RegularExpressions": "4.0.11-*",
         "System.Threading": "4.0.11-*",
         "System.Threading.Thread": "4.0.0-*"