diff --git a/DNSecure/Extensions/NEOnDemandRuleAction+Codable.swift b/DNSecure/Extensions/NEOnDemandRuleAction+Codable.swift
index 0ae8ebc..9888eb4 100644
--- a/DNSecure/Extensions/NEOnDemandRuleAction+Codable.swift
+++ b/DNSecure/Extensions/NEOnDemandRuleAction+Codable.swift
@@ -7,4 +7,4 @@
 
 import NetworkExtension
 
-extension NEOnDemandRuleAction: Codable {}
+extension NEOnDemandRuleAction: @retroactive Codable {}
diff --git a/DNSecure/Extensions/NEOnDemandRuleInterfaceType+Codable.swift b/DNSecure/Extensions/NEOnDemandRuleInterfaceType+Codable.swift
index 8889f31..bf3dd79 100644
--- a/DNSecure/Extensions/NEOnDemandRuleInterfaceType+Codable.swift
+++ b/DNSecure/Extensions/NEOnDemandRuleInterfaceType+Codable.swift
@@ -7,4 +7,4 @@
 
 import NetworkExtension
 
-extension NEOnDemandRuleInterfaceType: Codable {}
+extension NEOnDemandRuleInterfaceType: @retroactive Codable {}
diff --git a/DNSecure/Views/ContentView.swift b/DNSecure/Views/ContentView.swift
index c1fce01..12fdf6e 100644
--- a/DNSecure/Views/ContentView.swift
+++ b/DNSecure/Views/ContentView.swift
@@ -5,7 +5,7 @@
 //  Created by Kenta Kubo on 7/1/20.
 //
 
-import NetworkExtension
+@preconcurrency import NetworkExtension
 import SwiftUI
 
 struct ContentView {