diff --git a/zxscanner/android/app/build.gradle b/zxscanner/android/app/build.gradle
index bb5155b..dd18284 100644
--- a/zxscanner/android/app/build.gradle
+++ b/zxscanner/android/app/build.gradle
@@ -21,6 +21,12 @@ if (flutterVersionName == null) {
     flutterVersionName = '1.0'
 }
 
+def keystoreProperties = new Properties()
+def keystorePropertiesFile = rootProject.file('key.properties')
+if (keystorePropertiesFile.exists()) {
+    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
+}
+
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
@@ -53,11 +59,18 @@ android {
         versionName flutterVersionName
     }
 
+    signingConfigs {
+        release {
+            keyAlias keystoreProperties['keyAlias']
+            keyPassword keystoreProperties['keyPassword']
+            storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
+            storePassword keystoreProperties['storePassword']
+        }
+    }
+
     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.debug
+            signingConfig signingConfigs.release
         }
     }
 }
diff --git a/zxscanner/android/build.gradle b/zxscanner/android/build.gradle
index 61afb9d..48a5fe9 100644
--- a/zxscanner/android/build.gradle
+++ b/zxscanner/android/build.gradle
@@ -1,12 +1,12 @@
 buildscript {
-    ext.kotlin_version = '1.6.21'
+    ext.kotlin_version = '1.7.0'
     repositories {
         google()
         mavenCentral()
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.1.3'
+        classpath 'com.android.tools.build:gradle:7.2.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/zxscanner/pubspec.yaml b/zxscanner/pubspec.yaml
index 2e1dfb9..3b4c30d 100644
--- a/zxscanner/pubspec.yaml
+++ b/zxscanner/pubspec.yaml
@@ -2,7 +2,7 @@ name: zxscanner
 description: A barcode scanner application.
 publish_to: 'none'
 
-version: 1.0.0+2
+version: 1.0.0+4
 
 environment:
   sdk: ">=2.17.0 <3.0.0"