diff --git a/app/build.gradle b/app/build.gradle
index 9b60148..cf693e7 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -8,8 +8,8 @@ android {
         applicationId "com.github.axet.audiorecorder"
         minSdkVersion 9
         targetSdkVersion 23
-        versionCode 134
-        versionName "1.5.5"
+        versionCode 135
+        versionName "1.5.6"
     }
     signingConfigs {
         release {
diff --git a/app/src/main/java/com/github/axet/audiorecorder/activities/RecordingActivity.java b/app/src/main/java/com/github/axet/audiorecorder/activities/RecordingActivity.java
index b22ef2a..f7f61db 100644
--- a/app/src/main/java/com/github/axet/audiorecorder/activities/RecordingActivity.java
+++ b/app/src/main/java/com/github/axet/audiorecorder/activities/RecordingActivity.java
@@ -12,7 +12,6 @@ import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.media.AudioFormat;
 import android.media.AudioRecord;
-import android.media.AudioTrack;
 import android.media.MediaRecorder;
 import android.os.Build;
 import android.os.Bundle;
@@ -35,6 +34,7 @@ import android.widget.TextView;
 import android.widget.Toast;
 
 import com.github.axet.androidlibrary.animations.MarginBottomAnimation;
+import com.github.axet.androidlibrary.sound.AudioTrack;
 import com.github.axet.audiolibrary.app.RawSamples;
 import com.github.axet.audiolibrary.app.Sound;
 import com.github.axet.audiolibrary.app.Storage;