diff --git a/android/app/src/main/java/com/codebridgex/webapp/AppUpdateChecker.java b/android/app/src/main/java/com/codebridgex/webapp/AppUpdateChecker.java
index 60726fb..3162956 100644
--- a/android/app/src/main/java/com/codebridgex/webapp/AppUpdateChecker.java
+++ b/android/app/src/main/java/com/codebridgex/webapp/AppUpdateChecker.java
@@ -8,9 +8,11 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
 import android.net.Uri;
 import android.os.Build;
 import android.os.Environment;
+import android.provider.Settings;
 import android.util.Log;
 
 import androidx.core.content.FileProvider;
@@ -33,6 +35,7 @@ public class AppUpdateChecker {
 
     private final Activity activity;
     private final ExecutorService executor = Executors.newSingleThreadExecutor();
+    private String pendingInstallFileName;
 
     public AppUpdateChecker(Activity activity) {
         this.activity = activity;
@@ -178,9 +181,81 @@ public class AppUpdateChecker {
     }
 
     /**
-     * APK 설치 Intent 실행
+     * APK 설치 Intent 실행 (권한 체크 포함)
      */
     private void installApk(String fileName) {
+        try {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                if (!activity.getPackageManager().canRequestPackageInstalls()) {
+                    // 권한 없음 → 설정 화면 안내
+                    pendingInstallFileName = fileName;
+                    activity.runOnUiThread(() -> showInstallPermissionDialog());
+                    return;
+                }
+            }
+
+            launchInstallIntent(fileName);
+
+        } catch (Exception e) {
+            Log.e(TAG, "Install APK error", e);
+        }
+    }
+
+    /**
+     * 출처를 알 수 없는 앱 설치 권한 안내 다이얼로그
+     */
+    private void showInstallPermissionDialog() {
+        if (activity.isFinishing() || activity.isDestroyed()) return;
+
+        new AlertDialog.Builder(activity)
+                .setTitle("설치 권한 필요")
+                .setMessage("앱 업데이트를 설치하려면 '출처를 알 수 없는 앱 설치' 권한을 허용해주세요.\n\n설정 화면으로 이동합니다.")
+                .setCancelable(false)
+                .setPositiveButton("설정으로 이동", (dialog, which) -> {
+                    dialog.dismiss();
+                    openInstallPermissionSettings();
+                })
+                .setNegativeButton("취소", (dialog, which) -> {
+                    dialog.dismiss();
+                    pendingInstallFileName = null;
+                })
+                .show();
+    }
+
+    /**
+     * 출처를 알 수 없는 앱 설치 설정 화면 열기
+     */
+    private void openInstallPermissionSettings() {
+        try {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                Intent intent = new Intent(Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES);
+                intent.setData(Uri.parse("package:" + activity.getPackageName()));
+                activity.startActivityForResult(intent, 1001);
+            }
+        } catch (Exception e) {
+            Log.e(TAG, "Open install permission settings error", e);
+        }
+    }
+
+    /**
+     * 설정 화면에서 돌아온 후 설치 재시도
+     */
+    public void onActivityResult(int requestCode, int resultCode) {
+        if (requestCode == 1001 && pendingInstallFileName != null) {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O
+                    && activity.getPackageManager().canRequestPackageInstalls()) {
+                launchInstallIntent(pendingInstallFileName);
+            } else {
+                Log.w(TAG, "Install permission still not granted");
+            }
+            pendingInstallFileName = null;
+        }
+    }
+
+    /**
+     * 실제 APK 설치 Intent 실행
+     */
+    private void launchInstallIntent(String fileName) {
         try {
             File apkFile = new File(activity.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS), fileName);
             if (!apkFile.exists()) {
@@ -202,7 +277,7 @@ public class AppUpdateChecker {
             activity.startActivity(installIntent);
 
         } catch (Exception e) {
-            Log.e(TAG, "Install APK error", e);
+            Log.e(TAG, "Launch install intent error", e);
         }
     }
 
diff --git a/android/app/src/main/java/com/codebridgex/webapp/MainActivity.java b/android/app/src/main/java/com/codebridgex/webapp/MainActivity.java
index 5ce3fab..71b0dfb 100644
--- a/android/app/src/main/java/com/codebridgex/webapp/MainActivity.java
+++ b/android/app/src/main/java/com/codebridgex/webapp/MainActivity.java
@@ -6,12 +6,15 @@ import android.content.Context;
 import android.media.AudioAttributes;
 import android.net.Uri;
 import android.os.Build;
+import android.content.Intent;
 import android.os.Bundle;
 
 import com.getcapacitor.BridgeActivity;
 
 public class MainActivity extends BridgeActivity {
 
+    private AppUpdateChecker updateChecker;
+
     // 채널 ID (FCM payload의 android.notification.channel_id 로 사용할 값)
     public static final String CHANNEL_DEFAULT         = "push_default";
     public static final String CHANNEL_VENDOR_REGISTER = "push_vendor_register";
@@ -27,7 +30,8 @@ public class MainActivity extends BridgeActivity {
         createNotificationChannels();
 
         // 인앱 업데이트 체크
-        new AppUpdateChecker(this).checkForUpdate();
+        updateChecker = new AppUpdateChecker(this);
+        updateChecker.checkForUpdate();
 
         // WebView 줌 설정 (핀치 줌 활성화)
         getBridge().getWebView().getSettings().setSupportZoom(true);
@@ -137,4 +141,12 @@ public class MainActivity extends BridgeActivity {
         nm.createNotificationChannel(chPurchaseOrder);
         nm.createNotificationChannel(chContract);
     }
+
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+        super.onActivityResult(requestCode, resultCode, data);
+        if (updateChecker != null) {
+            updateChecker.onActivityResult(requestCode, resultCode);
+        }
+    }
 }
\ No newline at end of file