diff --git a/README.md b/README.md
index 88fff9f..d8d1e56 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ Inspired by [flutter_cache_manager](https://github.com/renefloor/flutter_cache_m
 
 ```yaml
 dependencies:
-  dio_http_cache: ^0.3.x #latest version
+  dio_http_cache: ^0.4.x #latest version
 ```
 
 ### QuickStart
diff --git a/example/ios/Flutter/AppFrameworkInfo.plist b/example/ios/Flutter/AppFrameworkInfo.plist
index 9367d48..8d4492f 100644
--- a/example/ios/Flutter/AppFrameworkInfo.plist
+++ b/example/ios/Flutter/AppFrameworkInfo.plist
@@ -21,6 +21,6 @@
   <key>CFBundleVersion</key>
   <string>1.0</string>
   <key>MinimumOSVersion</key>
-  <string>8.0</string>
+  <string>9.0</string>
 </dict>
 </plist>
diff --git a/example/ios/Flutter/Flutter.podspec b/example/ios/Flutter/Flutter.podspec
index 2c4421c..663d5b2 100644
--- a/example/ios/Flutter/Flutter.podspec
+++ b/example/ios/Flutter/Flutter.podspec
@@ -11,7 +11,7 @@ Pod::Spec.new do |s|
   s.license          = { :type => 'MIT' }
   s.author           = { 'Flutter Dev Team' => 'flutter-dev@googlegroups.com' }
   s.source           = { :git => 'https://github.com/flutter/engine', :tag => s.version.to_s }
-  s.ios.deployment_target = '8.0'
+  s.ios.deployment_target = '9.0'
   # Framework linking is handled by Flutter tooling, not CocoaPods.
   # Add a placeholder to satisfy `s.dependency 'Flutter'` plugin podspecs.
   s.vendored_frameworks = 'path/to/nothing'
diff --git a/example/ios/Podfile.lock b/example/ios/Podfile.lock
index 7b3fd81..0534963 100644
--- a/example/ios/Podfile.lock
+++ b/example/ios/Podfile.lock
@@ -22,10 +22,10 @@ EXTERNAL SOURCES:
     :path: ".symlinks/plugins/sqflite/ios"
 
 SPEC CHECKSUMS:
-  Flutter: 434fef37c0980e73bb6479ef766c45957d4b510c
+  Flutter: 50d75fe2f02b26cc09d224853bb45737f8b3214a
   FMDB: 2ce00b547f966261cd18927a3ddb07cb6f3db82a
   sqflite: 6d358c025f5b867b29ed92fc697fd34924e11904
 
 PODFILE CHECKSUM: 4f075935f8d51cabd6114ffcdb57f90115d955bd
 
-COCOAPODS: 1.10.1
+COCOAPODS: 1.11.2
diff --git a/example/ios/Runner.xcodeproj/project.pbxproj b/example/ios/Runner.xcodeproj/project.pbxproj
index b069340..c9e979f 100644
--- a/example/ios/Runner.xcodeproj/project.pbxproj
+++ b/example/ios/Runner.xcodeproj/project.pbxproj
@@ -3,7 +3,7 @@
 	archiveVersion = 1;
 	classes = {
 	};
-	objectVersion = 46;
+	objectVersion = 50;
 	objects = {
 
 /* Begin PBXBuildFile section */
@@ -168,7 +168,7 @@
 		97C146E61CF9000F007C117D /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 0910;
+				LastUpgradeCheck = 1300;
 				ORGANIZATIONNAME = "The Chromium Authors";
 				TargetAttributes = {
 					97C146ED1CF9000F007C117D = {
@@ -354,7 +354,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				TARGETED_DEVICE_FAMILY = "1,2";
@@ -431,7 +431,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
@@ -478,7 +478,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				TARGETED_DEVICE_FAMILY = "1,2";
diff --git a/example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme b/example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme
index 786d6aa..f156018 100644
--- a/example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme
+++ b/example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0910"
+   LastUpgradeVersion = "1300"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/lib/src/builder_dio.dart b/lib/src/builder_dio.dart
index e62885a..ff15bad 100644
--- a/lib/src/builder_dio.dart
+++ b/lib/src/builder_dio.dart
@@ -17,7 +17,7 @@ Options buildServiceCacheOptions(
         forceRefresh: forceRefresh);
 
 /// build a normal cache options
-Options buildCacheOptions(Duration maxAge,
+Options buildCacheOptions(Duration? maxAge,
         {Duration? maxStale,
         String? primaryKey,
         String? subKey,
diff --git a/pubspec.yaml b/pubspec.yaml
index 089a63a..71d9dfc 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,21 +1,20 @@
 name: dio_http_cache
 description: http cache lib for Flutter dio like RxCache.It use sqflite as disk cache,and google/quiver-dart/LRU strategy as memory cache.
-version: 0.3.0
+version: 0.4.0
 authors:
   - Hurshi <ihsruh@gmail.com>
   - Eric Kok <erickok@gmail.com>
 homepage: https://github.com/hurshi/dio-http-cache
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: '>=2.14.0 <3.0.0'
 
 dependencies:
   crypto: ^3.0.1
   dio: ^4.0.0
   flutter:
     sdk: flutter
-  json_serializable: ^4.1.4
-  json_annotation: ^4.0.1
+  json_serializable: ^6.1.0
   path: ^1.8.0
   quiver: ^3.0.1
   sqflite: ^2.0.0+3