diff --git a/android/app/build.gradle.kts b/android/app/build.gradle.kts
index 67b8c73..de6efde 100644
--- a/android/app/build.gradle.kts
+++ b/android/app/build.gradle.kts
@@ -1,9 +1,21 @@
+import java.util.Properties
+import java.io.FileInputStream
+
 plugins {
     id("com.android.application")
     // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
     id("dev.flutter.flutter-gradle-plugin")
 }
 
+// 릴리스 서명 키: android/key.properties 에서 읽음(파일은 git 제외).
+// 파일이 없으면(다른 개발자/CI) debug 키로 폴백하여 빌드는 깨지지 않게 함.
+val keystoreProperties = Properties()
+val keystorePropertiesFile = rootProject.file("key.properties")
+val hasReleaseKeystore = keystorePropertiesFile.exists()
+if (hasReleaseKeystore) {
+    keystoreProperties.load(FileInputStream(keystorePropertiesFile))
+}
+
 android {
     namespace = "com.specialpartners.spin"
     compileSdk = flutter.compileSdkVersion
@@ -25,11 +37,25 @@ android {
         versionName = flutter.versionName
     }
 
+    signingConfigs {
+        if (hasReleaseKeystore) {
+            create("release") {
+                storeFile = file(keystoreProperties["storeFile"] as String)
+                storePassword = keystoreProperties["storePassword"] as String
+                keyAlias = keystoreProperties["keyAlias"] as String
+                keyPassword = keystoreProperties["keyPassword"] as String
+            }
+        }
+    }
+
     buildTypes {
         release {
-            // TODO: Add your own signing config for the release build.
-            // Signing with the debug keys for now, so `flutter run --release` works.
-            signingConfig = signingConfigs.getByName("debug")
+            // key.properties 있으면 release 키로 서명, 없으면 debug 키 폴백.
+            signingConfig = if (hasReleaseKeystore) {
+                signingConfigs.getByName("release")
+            } else {
+                signingConfigs.getByName("debug")
+            }
         }
     }
 }