diff --git a/android/build.gradle b/android/build.gradle
index faacca8a..254590ae 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -9,8 +9,8 @@ buildscript {
     }
 
     dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.70"
-        classpath 'com.android.tools.build:gradle:3.6.1'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.0"
+        classpath 'com.android.tools.build:gradle:3.6.4'
     }
 }
 
@@ -28,14 +28,14 @@ apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
 
 android {
-    compileSdkVersion 28
+    compileSdkVersion 30
 
     sourceSets {
         main.java.srcDirs += 'src/main/kotlin'
     }
     defaultConfig {
         minSdkVersion 16
-        targetSdkVersion 28
+        targetSdkVersion 30
         versionCode 1
         versionName "1.0"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
@@ -68,7 +68,7 @@ android {
 }
 
 dependencies {
-    api 'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.70'
+    api 'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.71'
     implementation 'androidx.annotation:annotation:1.1.0'
     implementation 'com.stripe:stripe-android:16.10.0'
     implementation 'com.android.support:appcompat-v7:28.0.0'
diff --git a/android/gradle.properties b/android/gradle.properties
index 8bd86f68..53ae0ae4 100644
--- a/android/gradle.properties
+++ b/android/gradle.properties
@@ -1 +1,3 @@
+android.enableJetifier=true
+android.useAndroidX=true
 org.gradle.jvmargs=-Xmx1536M
diff --git a/android/gradle/wrapper/gradle-wrapper.properties b/android/gradle/wrapper/gradle-wrapper.properties
index b8417dba..02b50539 100644
--- a/android/gradle/wrapper/gradle-wrapper.properties
+++ b/android/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-all.zip
diff --git a/android/src/main/res/layout/activity_stripe.xml b/android/src/main/res/layout/activity_stripe.xml
index 5385a75f..f27b836d 100644
--- a/android/src/main/res/layout/activity_stripe.xml
+++ b/android/src/main/res/layout/activity_stripe.xml
@@ -19,7 +19,7 @@
     <Button
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Save"
+        android:text="@string/save"
         android:id="@+id/buttonSave"/>
 
     <androidx.core.widget.ContentLoadingProgressBar
diff --git a/android/src/main/res/values-ja/strings.xml b/android/src/main/res/values-ja/strings.xml
new file mode 100644
index 00000000..7e3cba39
--- /dev/null
+++ b/android/src/main/res/values-ja/strings.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="save">予約を確定する</string>
+</resources>
\ No newline at end of file
diff --git a/android/src/main/res/values/strings.xml b/android/src/main/res/values/strings.xml
new file mode 100644
index 00000000..294600e5
--- /dev/null
+++ b/android/src/main/res/values/strings.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="save">Save</string>
+</resources>
\ No newline at end of file