diff --git a/README.md b/README.md
index 7ff1078..80137b0 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ DSBridge-Android:https://github.com/wendux/DSBridge-Android
 ## Download
 
 ```objective-c
-pod "dsBridge"
+pod "dsBridge","2.0.6"
 ```
 
 ## Usage
@@ -51,9 +51,9 @@ pod "dsBridge"
 
      ```javascript
      //cdn
-     //<script src="https://unpkg.com/dsbridge/dist/dsbridge.js"> </script>
+     //<script src="https://unpkg.com/dsbridge@2.0.0/dist/dsbridge.js"> </script>
      //npm
-     //npm install dsbridge
+     //npm install dsbridge@2.0.0
      var dsBridge=require("dsbridge")
      ```
 
diff --git a/dsBridge.podspec b/dsBridge.podspec
index 2144212..80e1932 100644
--- a/dsBridge.podspec
+++ b/dsBridge.podspec
@@ -16,7 +16,7 @@ Pod::Spec.new do |s|
   #
 
   s.name         = "dsBridge"
-  s.version      = "2.0.5"
+  s.version      = "2.0.6"
   s.summary      = "An ios bridge for calling functions synchronously and asynchronously between JavaScript and Object-C in WKWebView/UIWebView"
 
   # This description is used to generate tags and improve search results.
diff --git a/dsbridge/DWebview.h b/dsbridge/DWebview.h
index 4b65846..8e179dd 100644
--- a/dsbridge/DWebview.h
+++ b/dsbridge/DWebview.h
@@ -21,7 +21,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (void)loadUrl: (NSString *) url;
 - (void)loadRequest:(NSURLRequest * )request;
-- (void)loadHTMLString:(NSString *)string baseURL:(nullable NSURL *)baseURL;
+- (void)loadHTMLString:(NSString *)string baseURL:(NSURL * _Nullable)baseURL;
 - (void)loadData:(NSData *)data MIMEType:(NSString *)MIMEType textEncodingName:(NSString *)textEncodingName baseURL:(NSURL *)baseURL;
 
 - (void)stopLoading;