diff --git a/samples/ErrorPageSample/project.json b/samples/ErrorPageSample/project.json
index f38335b51e..1d6422dc08 100644
--- a/samples/ErrorPageSample/project.json
+++ b/samples/ErrorPageSample/project.json
@@ -30,8 +30,8 @@
         "System.Resources.ResourceManager": "4.0.0.0",
         "System.Runtime": "4.0.20.0",
         "System.Runtime.Extensions": "4.0.10.0",
-        "System.Runtime.InteropServices": "4.0.10.0",
-        "System.Text.Encoding": "4.0.10.0",
+        "System.Runtime.InteropServices": "4.0.20.0",
+        "System.Text.Encoding": "4.0.20.0",
         "System.Threading.Tasks": "4.0.0.0"
       }
     }
diff --git a/samples/WelcomePageSample/project.json b/samples/WelcomePageSample/project.json
index f38335b51e..2e840afdb9 100644
--- a/samples/WelcomePageSample/project.json
+++ b/samples/WelcomePageSample/project.json
@@ -31,7 +31,7 @@
         "System.Runtime": "4.0.20.0",
         "System.Runtime.Extensions": "4.0.10.0",
         "System.Runtime.InteropServices": "4.0.10.0",
-        "System.Text.Encoding": "4.0.10.0",
+        "System.Text.Encoding": "4.0.20.0",
         "System.Threading.Tasks": "4.0.0.0"
       }
     }