diff --git a/build.gradle b/build.gradle
index c016e1b..ea7a8fe 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,7 +1,7 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.1.2-4'
+    ext.kotlin_version = '1.1.3-2'
     repositories {
         maven { url 'https://maven.google.com' }
         jcenter()
diff --git a/keystore b/keystore
new file mode 100644
index 0000000..82caf6d
Binary files /dev/null and b/keystore differ
diff --git a/mobile/build.gradle b/mobile/build.gradle
index a5dacc3..8103de9 100644
--- a/mobile/build.gradle
+++ b/mobile/build.gradle
@@ -13,8 +13,17 @@ android {
         versionName "0.4"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
+    signingConfigs {
+        release {
+            storeFile file("../keystore")
+            storePassword "password"
+            keyAlias "key0"
+            keyPassword "123456"
+        }
+    }
     buildTypes {
         release {
+            signingConfig signingConfigs.release
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }