diff --git a/samples/SelfHostServer/project.json b/samples/SelfHostServer/project.json
index 6bab457b0b..48fe41184a 100644
--- a/samples/SelfHostServer/project.json
+++ b/samples/SelfHostServer/project.json
@@ -17,7 +17,7 @@
         "System.Diagnostics.Tools": "4.0.0.0",
         "System.Globalization": "4.0.10.0",
         "System.IO": "4.0.0.0",
-        "System.IO.FileSystem": "4.0.10.0",
+        "System.IO.FileSystem": "4.0.0.0",
         "System.Linq": "4.0.0.0",
         "System.Reflection": "4.0.10.0",
         "System.Resources.ResourceManager": "4.0.0.0",
diff --git a/src/Microsoft.Net.Http.Server/project.json b/src/Microsoft.Net.Http.Server/project.json
index 1c2d1ea7f0..29fbbceb06 100644
--- a/src/Microsoft.Net.Http.Server/project.json
+++ b/src/Microsoft.Net.Http.Server/project.json
@@ -20,7 +20,7 @@
         "System.Diagnostics.Tools": "4.0.0.0",
         "System.Globalization": "4.0.10.0",
         "System.IO": "4.0.0.0",
-        "System.IO.FileSystem": "4.0.10.0",
+        "System.IO.FileSystem": "4.0.0.0",
         "System.Linq": "4.0.0.0",
         "System.Net.Primitives": "4.0.10.0",
         "System.Reflection": "4.0.10.0",