Update Swift version to support concurrency

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ on:
 jobs:
   test-macos:
     name: Test on macOS
-    runs-on: macos-latest
+    runs-on: macos-26
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -32,7 +32,7 @@ jobs:
     name: Test on Linux
     runs-on: ubuntu-latest
     container:
-      image: swift:5.9
+      image: swift:6.2
     steps:
       - name: Checkout code
         uses: actions/checkout@v4

.github/workflows/release.yml

@@ -8,7 +8,7 @@ on:
 jobs:
   build-macos:
     name: Build macOS Universal Binary
-    runs-on: macos-latest
+    runs-on: macos-26
     steps:
       - name: Checkout code
         uses: actions/checkout@v4

CLAUDE.md

@@ -168,7 +168,7 @@ The library has been fully implemented with:
 
 ## Installing Swift for Testing
 
-This project requires **Swift 5.9** or later.
+This project requires **Swift 6.2** or later.
 
 ### Prerequisites
 

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 5.9
+// swift-tools-version: 6.2
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription

README.md

@@ -325,7 +325,7 @@ cp .build/release/ejson /usr/local/bin/
 ```
 
 **Requirements:**
-- Swift 5.9+
+- Swift 6.2+
 - Linux only: libsodium-dev (`apt-get install libsodium-dev`)
 - macOS: No additional dependencies (uses bundled libsodium)
 
@@ -428,7 +428,7 @@ swift test
 
 ## Requirements
 
-- Swift 5.9+
+- Swift 6.2+
 - macOS 10.15+ / iOS 13+ / tvOS 13+ / watchOS 6+
 - Linux: libsodium-dev package required