diff --git a/src/Microsoft.AspNet.Server.Kestrel/project.json b/src/Microsoft.AspNet.Server.Kestrel/project.json
index 4cb8e6bd5d..8fce00cce0 100644
--- a/src/Microsoft.AspNet.Server.Kestrel/project.json
+++ b/src/Microsoft.AspNet.Server.Kestrel/project.json
@@ -33,10 +33,10 @@
         "System.Diagnostics.TraceSource": "4.0.0-*",
         "System.Diagnostics.Tracing": "4.0.21-*",
         "System.Globalization": "4.0.11-*",
-        "System.IO": "4.0.11-*",
+        "System.IO": "4.1.0-*",
         "System.Linq": "4.0.1-*",
         "System.Net.Primitives": "4.0.11-*",
-        "System.Runtime.Extensions": "4.0.11-*",
+        "System.Runtime.Extensions": "4.1.0-*",
         "System.Runtime.InteropServices": "4.0.21-*",
         "System.Text.Encoding": "4.0.11-*",
         "System.Threading": "4.0.11-*",
diff --git a/test/Microsoft.AspNet.Server.KestrelTests/project.json b/test/Microsoft.AspNet.Server.KestrelTests/project.json
index af2652e3a8..4060d91d5e 100644
--- a/test/Microsoft.AspNet.Server.KestrelTests/project.json
+++ b/test/Microsoft.AspNet.Server.KestrelTests/project.json
@@ -12,7 +12,6 @@
         "dnxcore50": {
             "dependencies": {
                 "System.Diagnostics.TraceSource": "4.0.0-*",
-                "System.IO": "4.0.11-*",
                 "System.Net.Http.WinHttpHandler": "4.0.0-*",
                 "System.Net.Sockets": "4.1.0-*",
                 "System.Runtime.Handles": "4.0.1-*"