diff --git a/android/src/main/java/audiorecorder2/audiorecorder2/AudioRecorder2Plugin.java b/android/src/main/java/audiorecorder2/audiorecorder2/AudioRecorder2Plugin.java
index 40eafaa..5a02c16 100644
--- a/android/src/main/java/audiorecorder2/audiorecorder2/AudioRecorder2Plugin.java
+++ b/android/src/main/java/audiorecorder2/audiorecorder2/AudioRecorder2Plugin.java
@@ -96,7 +96,7 @@ private void startRecording() {
     mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
     mRecorder.setOutputFormat(getOutputFormatFromString(mExtension));
     mRecorder.setOutputFile(mFilePath);
-    mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
+    mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
 
     try {
       mRecorder.prepare();
diff --git a/pubspec.yaml b/pubspec.yaml
index aaff716..0571513 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -11,8 +11,8 @@ dependencies:
   path: ^1.5.1
   flutter:
     sdk: flutter
-  path_provider: ^0.4.1
-  file: ^5.0.4
+  path_provider: ^2.0.0
+  file: ^6.0.0-nullsafety.2
 
 # For information on the generic Dart part of this file, see the
 # following page: https://www.dartlang.org/tools/pub/pubspec