diff --git a/ios/tencentcloud_cos_sdk_plugin.podspec b/ios/tencentcloud_cos_sdk_plugin.podspec
index 9197c6f..488d81c 100644
--- a/ios/tencentcloud_cos_sdk_plugin.podspec
+++ b/ios/tencentcloud_cos_sdk_plugin.podspec
@@ -17,7 +17,7 @@ Tencent COS Flutter Plugin SDK.
   s.source_files = 'Classes/**/*'
   s.public_header_files = 'Classes/**/*.h'
   s.dependency 'Flutter'
-  s.dependency 'QCloudCOSXML','>= 6.4.0'
+  s.dependency 'QCloudCOSXML','= 6.4.0'
   s.platform = :ios, '9.0'
   s.static_framework = true
 
diff --git a/lib/cos.dart b/lib/cos.dart
index 07efd42..c9ae00d 100644
--- a/lib/cos.dart
+++ b/lib/cos.dart
@@ -97,7 +97,8 @@ class Cos {
   /// 包括SessionCredential或ScopeLimitCredential
   Future<void> forceInvalidationCredential() async {
     flutterCosApi.forceInvalidationScopeCredentials();
-    return await _cosApi.forceInvalidationCredential();
+    await _cosApi.forceInvalidationCredential();
+    _initialized = false;
   }
 
   Future<void> setCloseBeacon(bool isCloseBeacon) async {