diff --git a/android/app/build.gradle b/android/app/build.gradle
index b20cdbd..580a8a8 100644
--- a/android/app/build.gradle
+++ b/android/app/build.gradle
@@ -27,7 +27,7 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 29
+    compileSdkVersion 28
 
     sourceSets {
         main.java.srcDirs += 'src/main/kotlin'
@@ -63,5 +63,5 @@ dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
     implementation platform('com.google.firebase:firebase-bom:26.6.0')
     implementation 'com.google.firebase:firebase-analytics'
-    implementation 'com.google.android.gms:play-services-ads:19.8.0'
-}
+    implementation 'com.google.android.gms:play-services-ads:19.7.0'
+}
\ No newline at end of file
diff --git a/android/build.gradle b/android/build.gradle
index 65a88d4..4988f52 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -7,8 +7,8 @@ buildscript {
 
     dependencies {
         classpath 'com.google.gms:google-services:4.3.5'
-        classpath 'com.android.tools.build:gradle:4.0.2'
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.61"
+        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
 
@@ -29,4 +29,4 @@ subprojects {
 
 task clean(type: Delete) {
     delete rootProject.buildDir
-}
+}
\ No newline at end of file