diff --git a/example/android/app/build.gradle b/example/android/app/build.gradle
index cfa014775..433cdf2a0 100644
--- a/example/android/app/build.gradle
+++ b/example/android/app/build.gradle
@@ -44,7 +44,7 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "io.agora.agora_rtc_ng_example"
-        minSdkVersion flutter.minSdkVersion
+        minSdkVersion 21
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
diff --git a/test_shard/fake_test_app/android/app/build.gradle b/test_shard/fake_test_app/android/app/build.gradle
index 9c373d29c..c5a9b1b13 100644
--- a/test_shard/fake_test_app/android/app/build.gradle
+++ b/test_shard/fake_test_app/android/app/build.gradle
@@ -46,7 +46,7 @@ android {
         applicationId "com.example.fake_test_app"
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-build-configuration.
-        minSdkVersion flutter.minSdkVersion
+        minSdkVersion 21
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
diff --git a/test_shard/integration_test_app/android/app/build.gradle b/test_shard/integration_test_app/android/app/build.gradle
index 486f3e47f..b5d21dc08 100644
--- a/test_shard/integration_test_app/android/app/build.gradle
+++ b/test_shard/integration_test_app/android/app/build.gradle
@@ -46,7 +46,7 @@ android {
         applicationId "io.agora.integration_test_app.integration_test_app"
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-build-configuration.
-        minSdkVersion flutter.minSdkVersion
+        minSdkVersion 21
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
diff --git a/test_shard/iris_tester/android/build.gradle b/test_shard/iris_tester/android/build.gradle
index d04ab28d9..5c7a1c019 100644
--- a/test_shard/iris_tester/android/build.gradle
+++ b/test_shard/iris_tester/android/build.gradle
@@ -43,7 +43,7 @@ android {
     }
 
     defaultConfig {
-        minSdkVersion 16
+        minSdkVersion 21
     }
 }
 
diff --git a/test_shard/rendering_test/android/app/build.gradle b/test_shard/rendering_test/android/app/build.gradle
index ab1e70e14..ad8cc0050 100644
--- a/test_shard/rendering_test/android/app/build.gradle
+++ b/test_shard/rendering_test/android/app/build.gradle
@@ -47,7 +47,7 @@ android {
         applicationId "com.example.rendering_test"
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-build-configuration.
-        minSdkVersion flutter.minSdkVersion
+        minSdkVersion 21
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName