diff --git a/fastlane/metadata/android/en-US/changelogs/97.txt b/fastlane/metadata/android/en-US/changelogs/97.txt
new file mode 100644
index 00000000..bd47354a
--- /dev/null
+++ b/fastlane/metadata/android/en-US/changelogs/97.txt
@@ -0,0 +1,2 @@
+Bug fixes
+- #571: Fixed media session null checks.
diff --git a/fastlane/metadata/android/es-ES/changelogs/97.txt b/fastlane/metadata/android/es-ES/changelogs/97.txt
new file mode 100644
index 00000000..25abfb8e
--- /dev/null
+++ b/fastlane/metadata/android/es-ES/changelogs/97.txt
@@ -0,0 +1,2 @@
+Correción de errores
+- #571: Se comprueban los valores nulos en la sesión de medios.
diff --git a/ultrasonic/build.gradle b/ultrasonic/build.gradle
index 4cc54f62..90935476 100644
--- a/ultrasonic/build.gradle
+++ b/ultrasonic/build.gradle
@@ -9,8 +9,8 @@ android {
 
     defaultConfig {
         applicationId "org.moire.ultrasonic"
-        versionCode 95
-        versionName "2.23.0"
+        versionCode 97
+        versionName "2.23.1"
 
         minSdkVersion versions.minSdk
         targetSdkVersion versions.targetSdk