diff --git a/samples/ErrorPageSample/project.json b/samples/ErrorPageSample/project.json
index aad5c0dec9..d992057175 100644
--- a/samples/ErrorPageSample/project.json
+++ b/samples/ErrorPageSample/project.json
@@ -25,7 +25,7 @@
         "System.Runtime.Extensions": "4.0.10.0",
         "System.Runtime.InteropServices": "4.0.20.0",
         "System.Security.Claims":  "1.0.0-*",
-        "System.Text.Encoding": "4.0.20.0",
+        "System.Text.Encoding": "4.0.10.0",
         "System.Threading.Tasks": "4.0.10.0"
       }
     }
diff --git a/samples/WelcomePageSample/project.json b/samples/WelcomePageSample/project.json
index 808c58145b..af5de5a751 100644
--- a/samples/WelcomePageSample/project.json
+++ b/samples/WelcomePageSample/project.json
@@ -25,7 +25,7 @@
         "System.Runtime.Extensions": "4.0.10.0",
         "System.Runtime.InteropServices": "4.0.20.0",
         "System.Security.Claims":  "1.0.0-*",
-        "System.Text.Encoding": "4.0.20.0",
+        "System.Text.Encoding": "4.0.10.0",
         "System.Threading.Tasks": "4.0.10.0"
       }
     }