diff --git a/app/build.gradle b/app/build.gradle
index 519863de..bb36e525 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -8,8 +8,8 @@ android {
         applicationId = 'com.tutpro.baresip'
         minSdkVersion 21
         targetSdkVersion 28
-        versionCode = 52
-        versionName = '6.3.0'
+        versionCode = 53
+        versionName = '6.3.1'
         externalNativeBuild {
             cmake {
                 cFlags '-DHAVE_INTTYPES_H'
diff --git a/app/src/main/assets/config b/app/src/main/assets/config
index 6cae02ee..7ca9accd 100644
--- a/app/src/main/assets/config
+++ b/app/src/main/assets/config
@@ -6,8 +6,8 @@ call_max_calls 4
 audio_player opensles,nil
 audio_source opensles,nil
 audio_alert opensles,nil
-audio_srate		8000-48000
-audio_channels		1-2
+audio_srate 8000-48000
+audio_channels 1-2
 audio_level no
 rtp_tos 184
 rtcp_mux no
diff --git a/fastlane/metadata/android/en-US/changelogs/6.3.1.txt b/fastlane/metadata/android/en-US/changelogs/6.3.1.txt
new file mode 100644
index 00000000..8e200269
--- /dev/null
+++ b/fastlane/metadata/android/en-US/changelogs/6.3.1.txt
@@ -0,0 +1,4 @@
+- Fixed and improved DTMF watcher implementation.
+- Disabled editing of Incoming/Outgoing Call URI when call is in progress.
+- Destroyed User Agent when account is deleted.
+- Removed unused KILL_BACKGROUND_PROCESSES permission.