diff --git a/app/build.gradle b/app/build.gradle
index 7f5f1a1..393b839 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -54,5 +54,5 @@ android {
 dependencies {
     testImplementation 'junit:junit:4.12'
     implementation 'com.github.axet:android-audio-library:1.0.153' // implementation project(':android-audio-library')
-    assets('com.google.android.exoplayer:exoplayer:2.8.4') { exclude group: 'com.android.support' }
+    assets('com.google.android.exoplayer:exoplayer:2.7.3') { exclude group: 'com.android.support' }
 }