diff --git a/samples/AntiforgerySample/package.json b/samples/AntiforgerySample/package.json
index e3693fbdb7..cad917e2a0 100644
--- a/samples/AntiforgerySample/package.json
+++ b/samples/AntiforgerySample/package.json
@@ -4,10 +4,6 @@
   "version": "0.0.0",
   "devDependencies": {
     "gulp": "^3.9.0",
-    "gulp-concat": "^2.6.0",
-    "gulp-cssmin": "^0.1.7",
-    "gulp-uglify": "^1.5.1",
-    "main-bower-files": "^2.9.0",
-    "rimraf": "^2.4.4"
+    "main-bower-files": "^2.9.0"
   }
 }
diff --git a/src/Microsoft.AspNetCore.Antiforgery/project.json b/src/Microsoft.AspNetCore.Antiforgery/project.json
index 2ef0639561..e1d6fe15b6 100644
--- a/src/Microsoft.AspNetCore.Antiforgery/project.json
+++ b/src/Microsoft.AspNetCore.Antiforgery/project.json
@@ -28,6 +28,10 @@
         "dotnet5.4"
       ]
     },
-    "net451": { }
+    "net451": {
+      "frameworkAssemblies": {
+        "System.Runtime": { "type": "build"}
+      }
+    }
   }
 }
\ No newline at end of file
diff --git a/test/Microsoft.AspNetCore.Antiforgery.FunctionalTests/project.json b/test/Microsoft.AspNetCore.Antiforgery.FunctionalTests/project.json
index e516749f67..7b345f04fe 100644
--- a/test/Microsoft.AspNetCore.Antiforgery.FunctionalTests/project.json
+++ b/test/Microsoft.AspNetCore.Antiforgery.FunctionalTests/project.json
@@ -20,8 +20,7 @@
     },
     "net451": {
       "dependencies": {
-        "Moq": "4.2.1312.1622",
-        "xunit.runner.console": "2.1.0"
+        "Moq": "4.2.1312.1622"
       },
       "frameworkAssemblies": {
         "System.Net.Http": ""