diff --git a/src/Microsoft.AspNet.Server.Kestrel/project.json b/src/Microsoft.AspNet.Server.Kestrel/project.json
index de43a8c018..cdf77c22f4 100644
--- a/src/Microsoft.AspNet.Server.Kestrel/project.json
+++ b/src/Microsoft.AspNet.Server.Kestrel/project.json
@@ -1,4 +1,4 @@
-{
+{
     "version": "1.0.0-*",
     "dependencies": {
         "Microsoft.Framework.Runtime.Interfaces": "1.0.0-*"
@@ -24,7 +24,7 @@
                 "System.Threading.Tasks": "4.0.10.0",
                 "System.Diagnostics.Tracing": "4.0.10.0",
                 "System.Collections": "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.Extensions": "4.0.10.0",
diff --git a/test/Microsoft.AspNet.Server.KestrelTests/project.json b/test/Microsoft.AspNet.Server.KestrelTests/project.json
index 9afbb9a1e3..17f1a499c1 100644
--- a/test/Microsoft.AspNet.Server.KestrelTests/project.json
+++ b/test/Microsoft.AspNet.Server.KestrelTests/project.json
@@ -1,4 +1,4 @@
-{
+{
     "version": "1.0.0-*",
     "dependencies": {
         "Xunit.KRunner": "1.0.0-*",
@@ -13,7 +13,7 @@
             "dependencies": {
                 "System.Net.Sockets": "4.0.0.0",
                 "System.Runtime.Handles": "4.0.0.0",
-                "System.IO": "4.0.0.0"
+                "System.IO": "4.0.10.0"
             }
         }
     },