diff --git a/ACardEmulator/app/build.gradle b/ACardEmulator/app/build.gradle
index 5b12d82..b220c03 100644
--- a/ACardEmulator/app/build.gradle
+++ b/ACardEmulator/app/build.gradle
@@ -16,8 +16,8 @@ android {
         applicationId "com.vsmartcard.acardemulator"
         minSdkVersion 19
         targetSdkVersion 23
-        versionCode 3
-        versionName "3.0"
+        versionCode 4
+        versionName "3.1"
     }
     buildTypes {
         release {