diff --git a/.gitignore b/.gitignore
index c8c70f2..bc03af2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 /build
 /.gradle
+appkey.jks
+signing.properties
diff --git a/app/build.gradle b/app/build.gradle
index cc8b112..437e423 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,5 +1,14 @@
 apply plugin: 'com.android.application'
 
+def keystorePropertiesFile = rootProject.file("signing.properties")
+def keystoreProperties = new Properties()
+
+try {
+    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
+} catch (Exception e) {
+    keystoreProperties = null
+}
+
 android {
     compileSdkVersion 30
     buildToolsVersion "33.0.0"
@@ -7,15 +16,35 @@ android {
     defaultConfig {
         applicationId "cc.winboll.gallery"
         minSdkVersion 16
-        targetSdkVersion 26
+        targetSdkVersion 30
         versionCode 1
         versionName "1.0"
     }
+    
+    signingConfigs {
+        release {
+            if (keystoreProperties != null) {
+                storeFile rootProject.file(keystoreProperties["STORE_FILE"])
+                storePassword keystoreProperties["STORE_PASSWORD"]
+                keyAlias keystoreProperties["KEY_ALIAS"]
+                keyPassword keystoreProperties["KEY_PASSWORD"]
+            } else {
+                storeFile rootProject.file("appkey.jks")
+                storePassword "appkey123"
+                keyAlias "winboll.cc"
+                keyPassword "appkey123"
+            }
+        }
+    }
     buildTypes {
         release {
             minifyEnabled false
+            signingConfig signingConfigs.release
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
+        debug {
+            signingConfig signingConfigs.release
+        }
     }
     
     buildFeatures {