diff --git a/src/Microsoft.AspNet.Http/project.json b/src/Microsoft.AspNet.Http/project.json
index 4a641d3f1e..3de806f0c7 100644
--- a/src/Microsoft.AspNet.Http/project.json
+++ b/src/Microsoft.AspNet.Http/project.json
@@ -1,4 +1,4 @@
-{
+{
   "version": "1.0.0-*",
   "dependencies": {},
   "frameworks": {
@@ -11,7 +11,7 @@
         "System.Diagnostics.Tools": "4.0.0.0",
         "System.Globalization": "4.0.10.0",
         "System.Globalization.Extensions": "4.0.0.0",
-        "System.IO": "4.0.0.0",
+        "System.IO": "4.0.10.0",
         "System.Linq": "4.0.0.0",
         "System.Runtime": "4.0.20.0",
         "System.Runtime.Extensions": "4.0.10.0",
diff --git a/src/Microsoft.AspNet.HttpFeature/project.json b/src/Microsoft.AspNet.HttpFeature/project.json
index 88d1a45513..6eb8e1aef3 100644
--- a/src/Microsoft.AspNet.HttpFeature/project.json
+++ b/src/Microsoft.AspNet.HttpFeature/project.json
@@ -1,11 +1,11 @@
-{
+{
   "version": "1.0.0-*",
   "frameworks": {
     "net45": {},
     "k10": {
       "dependencies": {
         "Microsoft.Net.WebSocketAbstractions": "1.0.0-*",
-        "System.IO": "4.0.0.0",
+        "System.IO": "4.0.10.0",
         "System.Net.Primitives": "4.0.10.0",
         "System.Runtime": "4.0.20.0",
         "System.Runtime.InteropServices": "4.0.20.0",
diff --git a/src/Microsoft.AspNet.Owin/project.json b/src/Microsoft.AspNet.Owin/project.json
index 014ce61ad1..aed0aa1fd5 100644
--- a/src/Microsoft.AspNet.Owin/project.json
+++ b/src/Microsoft.AspNet.Owin/project.json
@@ -1,4 +1,4 @@
-{
+{
   "version": "1.0.0-*",
   "dependencies": {
     "Microsoft.AspNet.Http": "",
@@ -14,7 +14,7 @@
         "System.ComponentModel": "4.0.0.0",
         "System.Diagnostics.Tools": "4.0.0.0",
         "System.Globalization": "4.0.10.0",
-        "System.IO": "4.0.0.0",
+        "System.IO": "4.0.10.0",
         "System.Linq": "4.0.0.0",
         "System.Net.Primitives": "4.0.10.0",
         "System.Runtime": "4.0.20.0",
diff --git a/src/Microsoft.AspNet.PipelineCore/project.json b/src/Microsoft.AspNet.PipelineCore/project.json
index 1d116f7302..316aaadbe0 100644
--- a/src/Microsoft.AspNet.PipelineCore/project.json
+++ b/src/Microsoft.AspNet.PipelineCore/project.json
@@ -1,4 +1,4 @@
-
+
 {
   "version": "1.0.0-*",
   "dependencies": {
@@ -16,7 +16,7 @@
         "System.Diagnostics.Debug": "4.0.10.0",
         "System.Diagnostics.Tools": "4.0.0.0",
         "System.Globalization": "4.0.10.0",
-        "System.IO": "4.0.0.0",
+        "System.IO": "4.0.10.0",
         "System.Linq": "4.0.0.0",
         "System.Runtime": "4.0.20.0",
         "System.Runtime.Extensions": "4.0.10.0",