diff --git a/ios/Classes/FlutterLibraryPlugin.swift b/ios/Classes/FlutterLibraryPlugin.swift
new file mode 100644
index 0000000..52524ef
--- /dev/null
+++ b/ios/Classes/FlutterLibraryPlugin.swift
@@ -0,0 +1,18 @@
+import Foundation
+import AmplitudeSwift
+
+class FlutterLibraryPlugin: BeforePlugin {
+    static let sdkLibrary = "amplitude-flutter"
+    // Version is managed automatically by semantic-release in release.config.js, please don't change it manually
+    static let sdkVersion = "4.0.0-beta.0"
+
+    override func setup(amplitude: Amplitude) {
+        super.setup(amplitude: amplitude)
+    }
+
+    override func execute(event: BaseEvent) -> BaseEvent? {
+        event.library = "\(FlutterLibraryPlugin.sdkLibrary)/\(FlutterLibraryPlugin.sdkVersion)"
+
+        return event
+    }
+}
diff --git a/ios/Classes/SwiftAmplitudeFlutterPlugin.swift b/ios/Classes/SwiftAmplitudeFlutterPlugin.swift
index 967fc9c..1133a38 100644
--- a/ios/Classes/SwiftAmplitudeFlutterPlugin.swift
+++ b/ios/Classes/SwiftAmplitudeFlutterPlugin.swift
@@ -18,10 +18,12 @@ import AmplitudeSwift
 
                 amplitude = Amplitude(configuration: getConfiguration(call: call))
 
-                // TODO(xinyi): add library plugin
+                // Set library
+                amplitude?.add(plugin: FlutterLibraryPlugin())
+
                 amplitude?.logger?.debug(message: "Amplitude has been successfully initialized.")
 
-                // TODO(xinyi): check app lifecycle events
+                // TODO(xinyi): add app lifecycle events
 
                 result("init called..")
 
@@ -171,7 +173,7 @@ import AmplitudeSwift
         case "debug":
             return .DEBUG
         default:
-            return .WARN
+            return .DEBUG
         }
     }
 
diff --git a/ios/amplitude_flutter.podspec b/ios/amplitude_flutter.podspec
index 169a40b..9888653 100644
--- a/ios/amplitude_flutter.podspec
+++ b/ios/amplitude_flutter.podspec
@@ -1,9 +1,12 @@
 #
 # To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html
 #
+
+amplitude_version = "4.0.0-beta.0" # Version is managed automatically by semantic-release, please don't change it manually
+
 Pod::Spec.new do |s|
   s.name             = 'amplitude_flutter'
-  s.version          = '0.0.1'
+  s.version          = amplitude_version
   s.summary          = 'A new flutter plugin project.'
   s.homepage         = 'http://example.com'
   s.license          = { :file => '../LICENSE' }
diff --git a/release.config.js b/release.config.js
index 7b5b234..03a5a8f 100644
--- a/release.config.js
+++ b/release.config.js
@@ -77,6 +77,20 @@ module.exports = {
             ],
             "countMatches": true
             },
+            {
+                "files": ["ios/Classes/FlutterLibraryPlugin.swift"],
+                "from": "static let sdkVersion = \".*\"",
+                "to": "static let sdkVersion = \"${nextRelease.version}\"",
+                "results": [
+                  {
+                    "file": "ios/Classes/FlutterLibraryPlugin.swift",
+                    "hasChanged": true,
+                    "numMatches": 1,
+                    "numReplacements": 1
+                  }
+                ],
+                "countMatches": true
+            },
         ]
       }
     ],