diff --git a/README.md b/README.md
index f8c1c97..5317aba 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,8 @@ See demo application for example code snippets.
 ### Gradle dependence
 ```Java
 dependencies {
+    implementation 'org.jetbrains.kotlin:kotlin-stdlib:1.3.50'
+    
     implementation 'net.akaish.ikey.hkb:ikey-hkb:0.5'
 }
 ```
diff --git a/ihkb_demo.gif b/ihkb_demo.gif
index 41b66fc..e09af78 100644
Binary files a/ihkb_demo.gif and b/ihkb_demo.gif differ