diff --git a/samples/MvcSandbox/project.json b/samples/MvcSandbox/project.json
index 69744c3475..e486dc7cfe 100644
--- a/samples/MvcSandbox/project.json
+++ b/samples/MvcSandbox/project.json
@@ -23,7 +23,8 @@
   "frameworks": {
     "dnx451": {
       "dependencies": {
-        "Microsoft.AspNetCore.Mvc.Dnx": "1.0.0-*"
+        "Microsoft.AspNetCore.Mvc.Dnx": "1.0.0-*",
+        "System.Runtime": "4.1.0-*"
       }
     },
     "net451": { },
diff --git a/src/Microsoft.AspNetCore.Mvc.Dnx/project.json b/src/Microsoft.AspNetCore.Mvc.Dnx/project.json
index a68452f014..3cce59feed 100644
--- a/src/Microsoft.AspNetCore.Mvc.Dnx/project.json
+++ b/src/Microsoft.AspNetCore.Mvc.Dnx/project.json
@@ -16,7 +16,10 @@
     "Microsoft.Dnx.Compilation.CSharp.Common": "1.0.0-*",
     "Microsoft.Dnx.Compilation.CSharp.Abstractions": "1.0.0-*",
     "Microsoft.Extensions.DependencyInjection": "1.0.0-*",
-    "Microsoft.Extensions.PlatformAbstractions.Dnx": "1.0.0-*"
+    "Microsoft.Extensions.PlatformAbstractions.Dnx": "1.0.0-*",
+    "System.IO": "4.1.0-*",
+    "System.Reflection": "4.1.0-*",
+    "System.Runtime": "4.1.0-*"
   },
   "frameworks": {
     "net451": {},
diff --git a/src/Microsoft.AspNetCore.Mvc.Razor/project.json b/src/Microsoft.AspNetCore.Mvc.Razor/project.json
index a06406b72b..7bc6f72ef2 100644
--- a/src/Microsoft.AspNetCore.Mvc.Razor/project.json
+++ b/src/Microsoft.AspNetCore.Mvc.Razor/project.json
@@ -29,7 +29,11 @@
     "Microsoft.Extensions.PropertyHelper.Sources": {
       "version": "1.0.0-*",
       "type": "build"
-    }
+    },
+    "System.Collections": "4.0.11-*",
+    "System.IO": "4.1.0-*",
+    "System.Reflection": "4.1.0-*",
+    "System.Threading": "4.0.11-*"
   },
   "frameworks": {
     "net451": {
diff --git a/test/Microsoft.AspNetCore.Mvc.Abstractions.Test/project.json b/test/Microsoft.AspNetCore.Mvc.Abstractions.Test/project.json
index 5490f3ac81..002f2597c1 100644
--- a/test/Microsoft.AspNetCore.Mvc.Abstractions.Test/project.json
+++ b/test/Microsoft.AspNetCore.Mvc.Abstractions.Test/project.json
@@ -26,6 +26,7 @@
     "dnx451": {
       "dependencies": {
         "Moq": "4.2.1312.1622",
+        "System.Runtime": "4.1.0-*",
         "xunit.runner.aspnet": "2.0.0-aspnet-*"
       }
     },
diff --git a/test/Microsoft.AspNetCore.Mvc.ApiExplorer.Test/project.json b/test/Microsoft.AspNetCore.Mvc.ApiExplorer.Test/project.json
index d7f58e5cc2..a27867df2f 100644
--- a/test/Microsoft.AspNetCore.Mvc.ApiExplorer.Test/project.json
+++ b/test/Microsoft.AspNetCore.Mvc.ApiExplorer.Test/project.json
@@ -31,6 +31,7 @@
     "dnx451": {
       "dependencies": {
         "Moq": "4.2.1312.1622",
+        "System.Runtime": "4.1.0-*",
         "xunit.runner.aspnet": "2.0.0-aspnet-*"
       }
     },
diff --git a/test/Microsoft.AspNetCore.Mvc.Core.Test/project.json b/test/Microsoft.AspNetCore.Mvc.Core.Test/project.json
index 79660823b8..75884e5bf0 100644
--- a/test/Microsoft.AspNetCore.Mvc.Core.Test/project.json
+++ b/test/Microsoft.AspNetCore.Mvc.Core.Test/project.json
@@ -41,6 +41,7 @@
     "dnx451": {
       "dependencies": {
         "Moq": "4.2.1312.1622",
+        "System.Runtime": "4.1.0-*",
         "xunit.runner.aspnet": "2.0.0-aspnet-*"
       }
     },
diff --git a/test/Microsoft.AspNetCore.Mvc.Cors.Test/project.json b/test/Microsoft.AspNetCore.Mvc.Cors.Test/project.json
index aa17a56ede..f5a3a7582f 100644
--- a/test/Microsoft.AspNetCore.Mvc.Cors.Test/project.json
+++ b/test/Microsoft.AspNetCore.Mvc.Cors.Test/project.json
@@ -33,6 +33,7 @@
     "dnx451": {
       "dependencies": {
         "Moq": "4.2.1312.1622",
+        "System.Runtime": "4.1.0-*",
         "xunit.runner.aspnet": "2.0.0-aspnet-*"
       }
     },
diff --git a/test/Microsoft.AspNetCore.Mvc.DataAnnotations.Test/project.json b/test/Microsoft.AspNetCore.Mvc.DataAnnotations.Test/project.json
index 060bcf4674..68aba67c14 100644
--- a/test/Microsoft.AspNetCore.Mvc.DataAnnotations.Test/project.json
+++ b/test/Microsoft.AspNetCore.Mvc.DataAnnotations.Test/project.json
@@ -33,6 +33,7 @@
     "dnx451": {
       "dependencies": {
         "Moq": "4.2.1312.1622",
+        "System.Runtime": "4.1.0-*",
         "xunit.runner.aspnet": "2.0.0-aspnet-*"
       }
     },
diff --git a/test/Microsoft.AspNetCore.Mvc.Formatters.Json.Test/project.json b/test/Microsoft.AspNetCore.Mvc.Formatters.Json.Test/project.json
index aa17a56ede..f5a3a7582f 100644
--- a/test/Microsoft.AspNetCore.Mvc.Formatters.Json.Test/project.json
+++ b/test/Microsoft.AspNetCore.Mvc.Formatters.Json.Test/project.json
@@ -33,6 +33,7 @@
     "dnx451": {
       "dependencies": {
         "Moq": "4.2.1312.1622",
+        "System.Runtime": "4.1.0-*",
         "xunit.runner.aspnet": "2.0.0-aspnet-*"
       }
     },
diff --git a/test/Microsoft.AspNetCore.Mvc.Formatters.Xml.Test/project.json b/test/Microsoft.AspNetCore.Mvc.Formatters.Xml.Test/project.json
index bd7632f2be..c82d000694 100644
--- a/test/Microsoft.AspNetCore.Mvc.Formatters.Xml.Test/project.json
+++ b/test/Microsoft.AspNetCore.Mvc.Formatters.Xml.Test/project.json
@@ -32,6 +32,7 @@
     "dnx451": {
       "dependencies": {
         "Moq": "4.2.1312.1622",
+        "System.Runtime": "4.1.0-*",
         "xunit.runner.aspnet": "2.0.0-aspnet-*"
       }
     },
diff --git a/test/Microsoft.AspNetCore.Mvc.FunctionalTests/project.json b/test/Microsoft.AspNetCore.Mvc.FunctionalTests/project.json
index 4e662bb0ed..7429d9b6cf 100644
--- a/test/Microsoft.AspNetCore.Mvc.FunctionalTests/project.json
+++ b/test/Microsoft.AspNetCore.Mvc.FunctionalTests/project.json
@@ -71,6 +71,11 @@
     "dnx451": {
       "dependencies": {
         "Microsoft.AspNetCore.Mvc.Dnx": "1.0.0-*",
+        "System.Collections": "4.0.11-*",
+        "System.IO": "4.1.0-*",
+        "System.Reflection": "4.1.0-*",
+        "System.Runtime": "4.1.0-*",
+        "System.Threading": "4.0.11-*",
         "xunit.runner.aspnet": "2.0.0-aspnet-*"
       }
     },
diff --git a/test/Microsoft.AspNetCore.Mvc.IntegrationTests/project.json b/test/Microsoft.AspNetCore.Mvc.IntegrationTests/project.json
index 6c3277df9e..0343b3410a 100644
--- a/test/Microsoft.AspNetCore.Mvc.IntegrationTests/project.json
+++ b/test/Microsoft.AspNetCore.Mvc.IntegrationTests/project.json
@@ -32,6 +32,7 @@
     "dnx451": {
       "dependencies": {
         "Moq": "4.2.1312.1622",
+        "System.Runtime": "4.1.0-*",
         "xunit.runner.aspnet": "2.0.0-aspnet-*"
       }
     },
diff --git a/test/Microsoft.AspNetCore.Mvc.Localization.Test/project.json b/test/Microsoft.AspNetCore.Mvc.Localization.Test/project.json
index f345f6709b..4e746dbedb 100644
--- a/test/Microsoft.AspNetCore.Mvc.Localization.Test/project.json
+++ b/test/Microsoft.AspNetCore.Mvc.Localization.Test/project.json
@@ -31,6 +31,7 @@
     "dnx451": {
       "dependencies": {
         "Moq": "4.2.1312.1622",
+        "System.Runtime": "4.1.0-*",
         "xunit.runner.aspnet": "2.0.0-aspnet-*"
       }
     },
diff --git a/test/Microsoft.AspNetCore.Mvc.Razor.Host.Test/project.json b/test/Microsoft.AspNetCore.Mvc.Razor.Host.Test/project.json
index 657f228418..c976378d92 100644
--- a/test/Microsoft.AspNetCore.Mvc.Razor.Host.Test/project.json
+++ b/test/Microsoft.AspNetCore.Mvc.Razor.Host.Test/project.json
@@ -38,6 +38,7 @@
     "dnx451": {
       "dependencies": {
         "Moq": "4.2.1312.1622",
+        "System.Runtime": "4.1.0-*",
         "xunit.runner.aspnet": "2.0.0-aspnet-*"
       }
     },
diff --git a/test/Microsoft.AspNetCore.Mvc.Razor.Test/project.json b/test/Microsoft.AspNetCore.Mvc.Razor.Test/project.json
index 3fefb5da9d..eb73809b2c 100644
--- a/test/Microsoft.AspNetCore.Mvc.Razor.Test/project.json
+++ b/test/Microsoft.AspNetCore.Mvc.Razor.Test/project.json
@@ -47,6 +47,7 @@
     "dnx451": {
       "dependencies": {
         "Moq": "4.2.1312.1622",
+        "System.Runtime": "4.1.0-*",
         "xunit.runner.aspnet": "2.0.0-aspnet-*"
       }
     },
diff --git a/test/Microsoft.AspNetCore.Mvc.TagHelpers.Test/project.json b/test/Microsoft.AspNetCore.Mvc.TagHelpers.Test/project.json
index 5aaa248e10..20e05e06b3 100644
--- a/test/Microsoft.AspNetCore.Mvc.TagHelpers.Test/project.json
+++ b/test/Microsoft.AspNetCore.Mvc.TagHelpers.Test/project.json
@@ -34,6 +34,7 @@
     "dnx451": {
       "dependencies": {
         "Moq": "4.2.1312.1622",
+        "System.Runtime": "4.1.0-*",
         "xunit.runner.aspnet": "2.0.0-aspnet-*"
       }
     },
diff --git a/test/Microsoft.AspNetCore.Mvc.Test/project.json b/test/Microsoft.AspNetCore.Mvc.Test/project.json
index 18c371029e..3d202bb42d 100644
--- a/test/Microsoft.AspNetCore.Mvc.Test/project.json
+++ b/test/Microsoft.AspNetCore.Mvc.Test/project.json
@@ -28,6 +28,7 @@
     "dnx451": {
       "dependencies": {
         "Moq": "4.2.1312.1622",
+        "System.Runtime": "4.1.0-*",
         "xunit.runner.aspnet": "2.0.0-aspnet-*"
       }
     },
diff --git a/test/Microsoft.AspNetCore.Mvc.ViewFeatures.Test/project.json b/test/Microsoft.AspNetCore.Mvc.ViewFeatures.Test/project.json
index b6d73866e2..330cbfb203 100644
--- a/test/Microsoft.AspNetCore.Mvc.ViewFeatures.Test/project.json
+++ b/test/Microsoft.AspNetCore.Mvc.ViewFeatures.Test/project.json
@@ -39,6 +39,7 @@
     "dnx451": {
       "dependencies": {
         "Moq": "4.2.1312.1622",
+        "System.Runtime": "4.1.0-*",
         "xunit.runner.aspnet": "2.0.0-aspnet-*"
       }
     },