diff --git a/samples/SelfHostServer/project.json b/samples/SelfHostServer/project.json
index 48fe41184a..bd23b22505 100644
--- a/samples/SelfHostServer/project.json
+++ b/samples/SelfHostServer/project.json
@@ -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.IO.FileSystem": "4.0.0.0",
         "System.Linq": "4.0.0.0",
         "System.Reflection": "4.0.10.0",
diff --git a/src/Microsoft.AspNet.Server.WebListener/project.json b/src/Microsoft.AspNet.Server.WebListener/project.json
index 2ee44e51cb..50b13d703d 100644
--- a/src/Microsoft.AspNet.Server.WebListener/project.json
+++ b/src/Microsoft.AspNet.Server.WebListener/project.json
@@ -23,7 +23,7 @@
         "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.Net.Primitives": "4.0.10.0",
         "System.Reflection": "4.0.10.0",
diff --git a/src/Microsoft.Net.Http.Server/project.json b/src/Microsoft.Net.Http.Server/project.json
index 29fbbceb06..a6ffbe5438 100644
--- a/src/Microsoft.Net.Http.Server/project.json
+++ b/src/Microsoft.Net.Http.Server/project.json
@@ -19,7 +19,7 @@
         "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.IO.FileSystem": "4.0.0.0",
         "System.Linq": "4.0.0.0",
         "System.Net.Primitives": "4.0.10.0",
diff --git a/src/Microsoft.Net.WebSockets/project.json b/src/Microsoft.Net.WebSockets/project.json
index 1a18c457ba..0a52489089 100644
--- a/src/Microsoft.Net.WebSockets/project.json
+++ b/src/Microsoft.Net.WebSockets/project.json
@@ -15,7 +15,7 @@
                     "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.Net.Primitives": "4.0.10.0",
                     "System.Reflection": "4.0.10.0",