diff --git a/samples/Mvc.Client/project.json b/samples/Mvc.Client/project.json
index 289e974a..8473860b 100644
--- a/samples/Mvc.Client/project.json
+++ b/samples/Mvc.Client/project.json
@@ -46,7 +46,7 @@
 
   "tools": {
     "Microsoft.AspNetCore.Server.IISIntegration.Tools": {
-      "version": "1.0.0-rc2-*",
+      "version": "1.0.0-preview1-*",
       "imports": "portable-net45+wp80+win8+wpa81+dnxcore50"
     }
   },
diff --git a/samples/Mvc.Server/project.json b/samples/Mvc.Server/project.json
index a264c337..c8a77aba 100644
--- a/samples/Mvc.Server/project.json
+++ b/samples/Mvc.Server/project.json
@@ -51,7 +51,7 @@
 
   "tools": {
     "Microsoft.AspNetCore.Server.IISIntegration.Tools": {
-      "version": "1.0.0-rc2-*",
+      "version": "1.0.0-preview1-*",
       "imports": "portable-net45+wp80+win8+wpa81+dnxcore50"
     }
   },