diff --git a/Package.resolved b/Package.resolved
index c0a7874..0b11f23 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -6,8 +6,8 @@
         "repositoryURL": "https://github.com/kishikawakatsumi/KeychainAccess",
         "state": {
           "branch": null,
-          "revision": "8d33ffd6f74b3bcfc99af759d4204c6395a3f918",
-          "version": "3.2.1"
+          "revision": "654d52d30f3dd4592e944c3e0bccb53178c992f6",
+          "version": "4.2.1"
         }
       }
     ]
diff --git a/Package.swift b/Package.swift
index b80e374..633d10d 100644
--- a/Package.swift
+++ b/Package.swift
@@ -4,13 +4,13 @@ import PackageDescription
 let package = Package(
     name: "SwiftDog",
     platforms: [
-       .iOS(.v8)
+       .iOS(.v9)
     ],
     products: [
         .library(name: "SwiftDog", targets: ["SwiftDog"]),
     ],
     dependencies: [
-        .package(url: "https://github.com/kishikawakatsumi/KeychainAccess", from: "3.1.0")
+        .package(url: "https://github.com/kishikawakatsumi/KeychainAccess", from: "4.2.1")
     ],
     targets: [ .target(name: "SwiftDog", dependencies: ["KeychainAccess"], path: "SwiftDog/Classes") ]
 )