diff --git a/build.gradle b/build.gradle
index 506fdfd..1601036 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,104 +1,81 @@
-apply plugin: 'idea'
-apply plugin: 'eclipse'
-apply plugin: 'java'
-apply plugin: 'com.diffplug.spotless'
+plugins {
+    id 'idea'
+    id 'eclipse'
+    id 'java'
+    id 'signing'
+    id 'com.diffplug.spotless' version '6.13.0'
+    id 'maven-publish'
+}
 
 group = 'com.kintone'
 version = '0.0.1-SNAPSHOT'
 
-buildscript {
-    repositories {
-        mavenCentral()
-    }
-    dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.+'
-        classpath 'com.github.dcendents:android-maven-gradle-plugin:2.1'
-        classpath 'com.diffplug.spotless:spotless-plugin-gradle:6.11.0'
-    }
-}
-
 repositories {
     mavenCentral()
 }
-sourceSets {
-    main.java.srcDirs = ['src/main/java']
-}
 
-if(hasProperty('target') && target == 'android') {
+sourceCompatibility = JavaVersion.VERSION_1_8
+targetCompatibility = JavaVersion.VERSION_1_8
+
+task javadocJar(type: Jar) {
+    archiveClassifier = 'javadoc'
+    from javadoc
+}
 
-    apply plugin: 'com.android.library'
-    apply plugin: 'com.github.dcendents.android-maven'
+task sourcesJar(type: Jar) {
+    archiveClassifier = 'sources'
+    from sourceSets.main.allSource
+}
 
-    android {
-        compileSdkVersion 25
-        buildToolsVersion '25.0.2'
-        defaultConfig {
-            minSdkVersion 14
-            targetSdkVersion 25
-        }
-        compileOptions {
-            sourceCompatibility JavaVersion.VERSION_1_8
-            targetCompatibility JavaVersion.VERSION_1_8
-        }
+artifacts {
+    archives javadocJar, sourcesJar
+}
 
-        // Rename the aar correctly
-        libraryVariants.all { variant ->
-            variant.outputs.each { output ->
-                def outputFile = output.outputFile
-                if (outputFile != null && outputFile.name.endsWith('.aar')) {
-                    def fileName = "${project.name}-${variant.baseName}-${version}.aar"
-                    output.outputFile = new File(outputFile.parent, fileName)
+publishing {
+    publications {
+        mavenJava(MavenPublication) {
+            artifactId = 'kintone-rest-client-java'
+            from components.java
+            pom {
+                name = 'kintone-rest-client-java'
+                description = 'API client library for Kintone REST APIs on Java.'
+                url = 'https://github.com/kintone/kintone-rest-client-java'
+                licenses {
+                    license {
+                        name = 'The MIT License'
+                        url = 'https://opensource.org/licenses/MIT'
+                    }
+                }
+                developers {
+                    developer {
+                        name = 'cybozu'
+                        email = 'oss@cybozu.com'
+                    }
+                }
+                scm {
+                    connection = 'https://github.com/kintone/kintone-rest-client-java.git'
+                    url = 'https://github.com/kintone/kintone-rest-client-java'
                 }
             }
         }
-
-        dependencies {
-            provided "jakarta.annotation:jakarta.annotation-api:$jakarta_annotation_version"
-        }
-    }
-
-    afterEvaluate {
-        android.libraryVariants.all { variant ->
-            def task = project.tasks.create "jar${variant.name.capitalize()}", Jar
-            task.description = "Create jar artifact for ${variant.name}"
-            task.dependsOn variant.javaCompile
-            task.from variant.javaCompile.destinationDirectory
-            task.destinationDirectory = project.file("${project.buildDir}/outputs/jar")
-            task.archiveFileName = "${project.name}-${variant.baseName}-${version}.jar"
-            artifacts.add('archives', task)
-        }
-    }
-
-    task sourcesJar(type: Jar) {
-        from android.sourceSets.main.java.srcDirs
-        classifier = 'sources'
-    }
-
-    artifacts {
-        archives sourcesJar
     }
-
-} else {
-
-    apply plugin: 'java'
-    apply plugin: 'maven-publish'
-
-    sourceCompatibility = JavaVersion.VERSION_1_8
-    targetCompatibility = JavaVersion.VERSION_1_8
-
-    publishing {
-        publications {
-            maven(MavenPublication) {
-               artifactId = 'kintone-rest-client'
-               from components.java
+    repositories {
+        maven {
+            def releasesRepoUrl = "https://oss.sonatype.org/service/local/staging/deploy/maven2"
+            def snapshotsRepoUrl = "https://oss.sonatype.org/content/repositories/snapshots"
+            url = version.endsWith('SNAPSHOT') ? snapshotsRepoUrl : releasesRepoUrl
+            if (project.hasProperty('sonatypeUsername') && project.hasProperty('sonatypePassword')) {
+                credentials {
+                    username = "${sonatypeUsername}"
+                    password = "${sonatypePassword}"
+                }
             }
         }
     }
+}
 
-    task execute(type:JavaExec) {
-       main = System.getProperty('mainClass')
-       classpath = sourceSets.main.runtimeClasspath
-    }
+signing {
+    sign publishing.publications.mavenJava
 }
 
 ext {
diff --git a/build.sbt b/build.sbt
deleted file mode 100644
index 9d0d474..0000000
--- a/build.sbt
+++ /dev/null
@@ -1,27 +0,0 @@
-lazy val root = (project in file(".")).
-  settings(
-    organization := "com.kintone",
-    name := "kintone-rest-client",
-    version := "0.0.1-SNAPSHOT",
-    scalaVersion := "2.11.4",
-    scalacOptions ++= Seq("-feature"),
-    javacOptions in compile ++= Seq("-Xlint:deprecation"),
-    publishArtifact in (Compile, packageDoc) := false,
-    resolvers += Resolver.mavenLocal,
-    libraryDependencies ++= Seq(
-      "io.swagger" % "swagger-annotations" % "1.6.5",
-      "com.squareup.okhttp3" % "okhttp" % "4.12.0",
-      "com.squareup.okhttp3" % "logging-interceptor" % "4.12.0",
-      "com.google.code.gson" % "gson" % "2.9.1",
-      "org.apache.commons" % "commons-lang3" % "3.17.0",
-      "jakarta.ws.rs" % "jakarta.ws.rs-api" % "2.1.6",
-      "org.openapitools" % "jackson-databind-nullable" % "0.2.6",
-      "io.gsonfire" % "gson-fire" % "1.9.0" % "compile",
-      "jakarta.annotation" % "jakarta.annotation-api" % "1.3.5" % "compile",
-      "com.google.code.findbugs" % "jsr305" % "3.0.2" % "compile",
-      "jakarta.annotation" % "jakarta.annotation-api" % "1.3.5" % "compile",
-      "org.junit.jupiter" % "junit-jupiter-api" % "5.10.3" % "test",
-      "com.novocode" % "junit-interface" % "0.10" % "test",
-      "org.mockito" % "mockito-core" % "3.12.4" % "test"
-    )
-  )
diff --git a/gradlew b/gradlew
old mode 100644
new mode 100755
diff --git a/pom.xml b/pom.xml
deleted file mode 100644
index c981215..0000000
--- a/pom.xml
+++ /dev/null
@@ -1,340 +0,0 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-    <groupId>com.kintone</groupId>
-    <artifactId>kintone-rest-client</artifactId>
-    <packaging>jar</packaging>
-    <name>kintone-rest-client</name>
-    <version>0.0.1-SNAPSHOT</version>
-    <url>https://github.com/openapitools/openapi-generator</url>
-    <description>OpenAPI Java</description>
-    <scm>
-        <connection>scm:git:git@github.com:openapitools/openapi-generator.git</connection>
-        <developerConnection>scm:git:git@github.com:openapitools/openapi-generator.git</developerConnection>
-        <url>https://github.com/openapitools/openapi-generator</url>
-    </scm>
-
-    <licenses>
-        <license>
-            <name>Unlicense</name>
-            <url>http://unlicense.org</url>
-            <distribution>repo</distribution>
-        </license>
-    </licenses>
-
-    <developers>
-        <developer>
-            <name>OpenAPI-Generator Contributors</name>
-            <email>team@openapitools.org</email>
-            <organization>OpenAPITools.org</organization>
-            <organizationUrl>http://openapitools.org</organizationUrl>
-        </developer>
-    </developers>
-
-    <build>
-        <plugins>
-           <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.1</version>
-                <configuration>
-                    <fork>true</fork>
-                    <meminitial>128m</meminitial>
-                    <maxmem>512m</maxmem>
-                    <compilerArgs>
-                        <arg>-Xlint:all</arg>
-                        <arg>-J-Xss4m</arg><!-- Compiling the generated JSON.java file may require larger stack size. -->
-                    </compilerArgs>
-                </configuration>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-enforcer-plugin</artifactId>
-                <version>3.4.1</version>
-                <executions>
-                    <execution>
-                        <id>enforce-maven</id>
-                        <goals>
-                            <goal>enforce</goal>
-                        </goals>
-                        <configuration>
-                            <rules>
-                                <requireMavenVersion>
-                                    <version>2.2.0</version>
-                                </requireMavenVersion>
-                            </rules>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-surefire-plugin</artifactId>
-                <version>2.22.2</version>
-                <configuration>
-                    <systemPropertyVariables>
-                        <property>
-                            <name>loggerPath</name>
-                            <value>conf/log4j.properties</value>
-                        </property>
-                    </systemPropertyVariables>
-                    <argLine>-Xms512m -Xmx1500m</argLine>
-                    <parallel>methods</parallel>
-                    <threadCount>10</threadCount>
-                </configuration>
-                <dependencies>
-                    <!--Custom provider and engine for Junit 5 to surefire-->
-                    <dependency>
-                        <groupId>org.junit.jupiter</groupId>
-                        <artifactId>junit-jupiter-engine</artifactId>
-                        <version>${junit-version}</version>
-                    </dependency>
-                </dependencies>
-            </plugin>
-            <plugin>
-                <artifactId>maven-dependency-plugin</artifactId>
-                <version>3.6.1</version>
-                <executions>
-                    <execution>
-                        <phase>package</phase>
-                        <goals>
-                            <goal>copy-dependencies</goal>
-                        </goals>
-                        <configuration>
-                            <outputDirectory>${project.build.directory}/lib</outputDirectory>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-            <!-- attach test jar -->
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-jar-plugin</artifactId>
-                <version>3.3.0</version>
-                <executions>
-                    <execution>
-                        <goals>
-                            <goal>test-jar</goal>
-                        </goals>
-                    </execution>
-                </executions>
-                <configuration>
-                </configuration>
-            </plugin>
-            <plugin>
-                <groupId>org.codehaus.mojo</groupId>
-                <artifactId>build-helper-maven-plugin</artifactId>
-                <version>3.5.0</version>
-                <executions>
-                    <execution>
-                        <id>add_sources</id>
-                        <phase>generate-sources</phase>
-                        <goals>
-                            <goal>add-source</goal>
-                        </goals>
-                        <configuration>
-                            <sources>
-                                <source>src/main/java</source>
-                            </sources>
-                        </configuration>
-                    </execution>
-                    <execution>
-                        <id>add_test_sources</id>
-                        <phase>generate-test-sources</phase>
-                        <goals>
-                            <goal>add-test-source</goal>
-                        </goals>
-                        <configuration>
-                            <sources>
-                                <source>src/test/java</source>
-                            </sources>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-javadoc-plugin</artifactId>
-                <version>3.6.3</version>
-                <executions>
-                    <execution>
-                        <id>attach-javadocs</id>
-                        <goals>
-                            <goal>jar</goal>
-                        </goals>
-                    </execution>
-                </executions>
-                <configuration>
-                    <doclint>none</doclint>
-                    <tags>
-                        <tag>
-                            <name>http.response.details</name>
-                            <placement>a</placement>
-                            <head>Http Response Details:</head>
-                        </tag>
-                    </tags>
-                </configuration>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-source-plugin</artifactId>
-                <version>3.3.0</version>
-                <executions>
-                    <execution>
-                        <id>attach-sources</id>
-                        <goals>
-                            <goal>jar-no-fork</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-            <!-- Use spotless plugin to automatically format code, remove unused import, etc
-                 To apply changes directly to the file, run `mvn spotless:apply`
-                 Ref: https://github.com/diffplug/spotless/tree/main/plugin-maven
-            -->
-            <plugin>
-              <groupId>com.diffplug.spotless</groupId>
-              <artifactId>spotless-maven-plugin</artifactId>
-              <version>${spotless.version}</version>
-              <configuration>
-                <formats>
-                  <!-- you can define as many formats as you want, each is independent -->
-                  <format>
-                    <!-- define the files to apply to -->
-                    <includes>
-                      <include>.gitignore</include>
-                    </includes>
-                    <!-- define the steps to apply to those files -->
-                    <trimTrailingWhitespace/>
-                    <endWithNewline/>
-                    <indent>
-                      <spaces>true</spaces> <!-- or <tabs>true</tabs> -->
-                      <spacesPerTab>4</spacesPerTab> <!-- optional, default is 4 -->
-                    </indent>
-                  </format>
-                </formats>
-                <!-- define a language-specific format -->
-                <java>
-                  <!-- no need to specify files, inferred automatically, but you can if you want -->
-
-                  <!-- apply a specific flavor of google-java-format and reflow long strings -->
-                  <googleJavaFormat>
-                    <version>1.8</version>
-                    <style>AOSP</style>
-                    <reflowLongStrings>true</reflowLongStrings>
-                  </googleJavaFormat>
-
-                  <removeUnusedImports/>
-                  <importOrder/>
-
-                </java>
-              </configuration>
-            </plugin>
-        </plugins>
-    </build>
-
-    <profiles>
-        <profile>
-            <id>sign-artifacts</id>
-            <build>
-                <plugins>
-                    <plugin>
-                        <groupId>org.apache.maven.plugins</groupId>
-                        <artifactId>maven-gpg-plugin</artifactId>
-                        <version>3.2.1</version>
-                        <executions>
-                            <execution>
-                                <id>sign-artifacts</id>
-                                <phase>verify</phase>
-                                <goals>
-                                    <goal>sign</goal>
-                                </goals>
-                            </execution>
-                        </executions>
-                    </plugin>
-                </plugins>
-            </build>
-        </profile>
-    </profiles>
-
-    <dependencies>
-        <!-- @Nullable annotation -->
-        <dependency>
-            <groupId>com.google.code.findbugs</groupId>
-            <artifactId>jsr305</artifactId>
-            <version>3.0.2</version>
-        </dependency>
-        <dependency>
-            <groupId>com.squareup.okhttp3</groupId>
-            <artifactId>okhttp</artifactId>
-            <version>${okhttp-version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.squareup.okhttp3</groupId>
-            <artifactId>logging-interceptor</artifactId>
-            <version>${okhttp-version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.google.code.gson</groupId>
-            <artifactId>gson</artifactId>
-            <version>${gson-version}</version>
-        </dependency>
-        <dependency>
-            <groupId>io.gsonfire</groupId>
-            <artifactId>gson-fire</artifactId>
-            <version>${gson-fire-version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-lang3</artifactId>
-            <version>${commons-lang3-version}</version>
-        </dependency>
-        <dependency>
-            <groupId>jakarta.annotation</groupId>
-            <artifactId>jakarta.annotation-api</artifactId>
-            <version>${jakarta-annotation-version}</version>
-            <scope>provided</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.openapitools</groupId>
-            <artifactId>jackson-databind-nullable</artifactId>
-            <version>${jackson-databind-nullable-version}</version>
-        </dependency>
-        <dependency>
-            <groupId>jakarta.ws.rs</groupId>
-            <artifactId>jakarta.ws.rs-api</artifactId>
-            <version>${jakarta.ws.rs-api-version}</version>
-        </dependency>
-        <!-- test dependencies -->
-        <dependency>
-            <groupId>org.junit.jupiter</groupId>
-            <artifactId>junit-jupiter-engine</artifactId>
-            <version>${junit-version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.junit.platform</groupId>
-            <artifactId>junit-platform-runner</artifactId>
-            <version>${junit-platform-runner.version}</version>
-            <scope>test</scope>
-        </dependency>
-    </dependencies>
-    <properties>
-        <java.version>1.8</java.version>
-        <maven.compiler.source>${java.version}</maven.compiler.source>
-        <maven.compiler.target>${java.version}</maven.compiler.target>
-        <gson-fire-version>1.9.0</gson-fire-version>
-        <okhttp-version>4.12.0</okhttp-version>
-        <gson-version>2.10.1</gson-version>
-        <commons-lang3-version>3.17.0</commons-lang3-version>
-        <jackson-databind-nullable-version>0.2.6</jackson-databind-nullable-version>
-        <jakarta-annotation-version>1.3.5</jakarta-annotation-version>
-        <beanvalidation-version>2.0.2</beanvalidation-version>
-        <junit-version>5.10.3</junit-version>
-        <junit-platform-runner.version>1.10.0</junit-platform-runner.version>
-        <jakarta.ws.rs-api-version>2.1.6</jakarta.ws.rs-api-version>
-        <jsr311-api-version>1.1.1</jsr311-api-version>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <spotless.version>2.43.0</spotless.version>
-    </properties>
-</project>