diff --git a/src/Microsoft.AspNet.WebSockets.Protocol/project.json b/src/Microsoft.AspNet.WebSockets.Protocol/project.json
index be38440635..c268656661 100644
--- a/src/Microsoft.AspNet.WebSockets.Protocol/project.json
+++ b/src/Microsoft.AspNet.WebSockets.Protocol/project.json
@@ -14,12 +14,12 @@
     "dotnet5.4": {
       "dependencies": {
         "System.Diagnostics.Contracts": "4.0.1-*",
-        "System.IO": "4.0.11-*",
+        "System.IO": "4.1.0-*",
         "System.Linq": "4.0.1-*",
         "System.Net.WebSockets": "4.0.0-*",
         "System.Runtime": "4.0.21-*",
         "System.Runtime.InteropServices": "4.0.21-*",
-        "System.Runtime.Extensions": "4.0.11-*",
+        "System.Runtime.Extensions": "4.1.0-*",
         "System.Security.Cryptography.Algorithms": "4.0.0-*",
         "System.Text.Encoding.Extensions": "4.0.11-*",
         "System.Threading": "4.0.11-*",
diff --git a/test/Microsoft.AspNet.WebSockets.Protocol.Test/project.json b/test/Microsoft.AspNet.WebSockets.Protocol.Test/project.json
index 9cc3c1ffdc..af40e33ade 100644
--- a/test/Microsoft.AspNet.WebSockets.Protocol.Test/project.json
+++ b/test/Microsoft.AspNet.WebSockets.Protocol.Test/project.json
@@ -5,9 +5,7 @@
     },
     "frameworks": {
         "dnx451": { },
-        "dnxcore50": {
-            "System.IO": "4.0.11-*"
-        }
+        "dnxcore50": { }
     },
     "commands": {
         "test": "xunit.runner.aspnet"