diff --git a/samples/SelfHostServer/project.json b/samples/SelfHostServer/project.json
index 845c594e63..7f6ec09eda 100644
--- a/samples/SelfHostServer/project.json
+++ b/samples/SelfHostServer/project.json
@@ -18,8 +18,7 @@
         "System.Diagnostics.Tools": "4.0.0.0",
         "System.Globalization": "4.0.10.0",
         "System.IO": "4.0.0.0",
-        "System.IO.FileSystem": "4.0.0.0",
-        "System.IO.FileSystem.Primitives": "4.0.0.0",
+        "System.IO.FileSystem": "4.0.10.0",
         "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.Server/project.json b/src/Microsoft.Net.Server/project.json
index 0316ca03aa..7a6f7cc088 100644
--- a/src/Microsoft.Net.Server/project.json
+++ b/src/Microsoft.Net.Server/project.json
@@ -21,7 +21,6 @@
         "System.Globalization": "4.0.10.0",
         "System.IO": "4.0.0.0",
         "System.IO.FileSystem": "4.0.10.0",
-        "System.IO.FileSystem.Primitives": "4.0.20.0",
         "System.Linq": "4.0.0.0",
         "System.Net.Primitives": "4.0.10.0",
         "System.Reflection": "4.0.10.0",