diff --git a/.gitignore b/.gitignore
index 02c0875..1b15a97 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,6 @@
 .DS_Store
-/.build
+/.build*
 /Packages
 /*.xcodeproj
+/*.pins
+/*.resolved
diff --git a/Package.swift b/Package.swift
index 2efa550..0d40187 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,9 +1,22 @@
+// swift-tools-version:4.0
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
 
 let package = Package(
     name: "PerfectMarkdown",
+    products: [
+        .library(
+            name: "PerfectMarkdown",
+            targets: ["PerfectMarkdown"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
     targets: [
-      Target(name: "upskirt", dependencies: []),
-      Target(name: "PerfectMarkdown", dependencies: ["upskirt"])
+      .target(name: "upskirt",dependencies: []),
+      .target(name: "PerfectMarkdown", dependencies: ["upskirt"]),
+      .testTarget(name: "PerfectMarkdownTests", dependencies: ["PerfectMarkdown"])
     ]
 )
diff --git a/README.md b/README.md
index 3bb80eb..fbc03e1 100644
--- a/README.md
+++ b/README.md
@@ -55,7 +55,13 @@ Perfect-Markdown is directly building on  [GerHobbelt's "upskirt"](https://githu
 Add dependencies to your Package.swift
 
 ``` swift
-.Package(url: "https://github.com/PerfectlySoft/Perfect-Markdown.git", majorVersion: 1)
+.package(url: "https://github.com/PerfectlySoft/Perfect-Markdown.git", 
+	from: "3.0.0")
+
+// on target section:
+.target(
+            // name: "your project name",
+            dependencies: ["PerfectMarkdown"]),
 ```
 
 ## Import Perfect Markdown Library
diff --git a/README.zh_CN.md b/README.zh_CN.md
index 430a00b..614fce7 100644
--- a/README.zh_CN.md
+++ b/README.zh_CN.md
@@ -59,7 +59,13 @@ Perfect-Markdown 直接基于  [GerHobbelt 的 "upskirt（超短裙）"](https:/
 请首先修改您的 Package.swift 文件增加依存关系：
 
 ``` swift
-.Package(url: "https://github.com/PerfectlySoft/Perfect-Markdown.git", majorVersion: 1)
+.package(url: "https://github.com/PerfectlySoft/Perfect-Markdown.git", 
+	from: "3.0.0")
+
+// on target section:
+.target(
+            // name: "your project name",
+            dependencies: ["PerfectMarkdown"]),
 ```
 
 ## 引用库函数
diff --git a/Sources/PerfectMarkdown/PerfectMarkdown.swift b/Sources/PerfectMarkdown/PerfectMarkdown.swift
index 74739ea..2ef2e97 100644
--- a/Sources/PerfectMarkdown/PerfectMarkdown.swift
+++ b/Sources/PerfectMarkdown/PerfectMarkdown.swift
@@ -18,7 +18,7 @@
 //
 
 #if os(Linux)
-import SwiftGlibc
+import Glibc
 #else
 import Darwin
 #endif