diff --git a/app/build.gradle b/app/build.gradle
index cec1ae15..15645211 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -12,7 +12,7 @@ android {
     }
     defaultConfig {
         applicationId "com.idormy.sms.forwarder"
-        minSdkVersion 23
+        minSdkVersion 21
         targetSdkVersion 29
         versionCode appVersionCode
         versionName appVersionName