diff --git a/README.md b/README.md
index 472cf0d..d05fd73 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ Add to `pubspec.yaml`:
 
 ```yaml
 dependencies:
-  oauth1: ^1.0.1
+  oauth1: ^1.0.4
 ```
 
 Please use like below.
@@ -27,7 +27,7 @@ void main() {
       'https://api.twitter.com/oauth/request_token', // temporary credentials request
       'https://api.twitter.com/oauth/authorize',     // resource owner authorization
       'https://api.twitter.com/oauth/access_token',  // token credentials request
-      oauth1.SignatureMethods.HMAC_SHA1              // signature method
+      oauth1.SignatureMethods.hmacSha1              // signature method
       );
 
   // define client credentials (consumer keys)