diff --git a/Package.swift b/Package.swift
index ef7d1be..be13759 100644
--- a/Package.swift
+++ b/Package.swift
@@ -8,8 +8,9 @@ let package = Package(
   platforms: [
     .macOS(.v10_15),
     .iOS(.v13),
-    .watchOS(.v6),
+    .visionOS(.v1),
     .tvOS(.v13),
+    .watchOS(.v6)
   ],
   products: [
     // Products define the executables and libraries a package produces, making them visible to other packages.
@@ -27,7 +28,7 @@ let package = Package(
     .default(enabledTraits: ["UseSwiftCrypto"]),
   ],
   dependencies: [
-    .package(url: "https://github.com/apple/swift-crypto", "1.0.0" ..< "4.0.0"),
+    .package(url: "https://github.com/apple/swift-crypto", from: "2.0.0"),
     .package(url: "https://github.com/lovetodream/swift-blake2", from: "0.1.0")
   ],
   targets: [
@@ -44,6 +45,5 @@ let package = Package(
       name: "MinisignTests",
       dependencies: ["Minisign"]
     ),
-  ],
-  swiftLanguageModes: [.v6]
+  ]
 )
diff --git a/Package@swift-5.9.swift b/Package@swift-5.8.swift
similarity index 85%
rename from Package@swift-5.9.swift
rename to Package@swift-5.8.swift
index 33d3fa9..a56c119 100644
--- a/Package@swift-5.9.swift
+++ b/Package@swift-5.8.swift
@@ -1,4 +1,4 @@
-// swift-tools-version: 5.9
+// swift-tools-version: 5.8
 
 import PackageDescription
 
@@ -7,8 +7,9 @@ let package = Package(
   platforms: [
     .macOS(.v10_15),
     .iOS(.v13),
-    .watchOS(.v6),
+    .visionOS(.v1),
     .tvOS(.v13),
+    .watchOS(.v6),
   ],
   products: [
     // Products define the executables and libraries a package produces, making them visible to other packages.
@@ -18,7 +19,7 @@ let package = Package(
     )
   ],
   dependencies: [
-    .package(url: "https://github.com/apple/swift-crypto", "1.0.0" ..< "4.0.0"),
+    .package(url: "https://github.com/apple/swift-crypto", from: "2.0.0"),
     .package(url: "https://github.com/lovetodream/swift-blake2", from: "0.1.0"),
   ],
   targets: [
@@ -39,5 +40,5 @@ let package = Package(
       dependencies: ["Minisign"]
     ),
   ],
-  swiftLanguageVersions: [.version("6"), .v5]
+  swiftLanguageModes: [.version("6"), .v5],
 )
diff --git a/README.md b/README.md
index 30180f4..4504a90 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,5 @@
 # Swift Minisign
 
-[![](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2Flaosb%2Fswift-minisign%2Fbadge%3Ftype%3Dplatforms)](https://swiftpackageindex.com/laosb/swift-minisign)
-[![](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2Flaosb%2Fswift-minisign%2Fbadge%3Ftype%3Dswift-versions)](https://swiftpackageindex.com/laosb/swift-minisign)
-
 Swift implementation of Minisign, a simple and secure tool for signing and verifying files.
 
 This is a fork of [slarew/swift-minisign](https://github.com/slarew/swift-minisign), with these improvements:
diff --git a/Sources/Minisign/Minisign.swift b/Sources/Minisign/Minisign.swift
index ecaa5b4..4093222 100644
--- a/Sources/Minisign/Minisign.swift
+++ b/Sources/Minisign/Minisign.swift
@@ -6,9 +6,9 @@ import BLAKE2
 import Foundation
 
 #if UseSwiftCrypto
-  @preconcurrency import Crypto
+  import Crypto
 #else
-  @preconcurrency import CryptoKit
+  import CryptoKit
 #endif
 
 public enum SignatureAlgorithm: Sendable, RawRepresentable {
@@ -87,12 +87,13 @@ public struct PublicKey: Sendable {
   ///
   /// This method reads the file in chunks to avoid loading the entire file into memory, but does so in a blocking manner.
   /// It's recommended to use this method in a background thread or task.
-  public func isValidSignature(_ signature: Signature, forFileAt url: URL, bufferSize: Int = 8192) throws -> Bool {
+  public func isValidSignature(_ signature: Signature, forFileAt url: URL) throws -> Bool {
     guard signature.signatureAlgorithm == .hashedEdDSA else { throw SignatureVerifyError.algorithmNotSupportedForFile }
     var blake2b = try! BLAKE2b()
 
     let fileHandle = try FileHandle(forReadingFrom: url)
 
+    let bufferSize = 4096
     while true {
       let data = fileHandle.readData(ofLength: bufferSize)
       if data.isEmpty { break }