diff --git a/build.gradle b/build.gradle
index 12fafad..a4b93b3 100644
--- a/build.gradle
+++ b/build.gradle
@@ -3,13 +3,13 @@ plugins {
     id "checkstyle"
     id "maven-publish"
     id "org.embulk.embulk-plugins" version "0.4.2"
+    id "signing"
 }
 repositories {
     mavenCentral()
-    jcenter()
 }
 
-group = "com.github.hiroyuki_sato"
+group = "io.github.hiroyuki-sato"
 version = "0.4.0-SNAPSHOT"
 description = "Parses JSON files with JSONPath read by other file input plugins."
 
@@ -17,10 +17,10 @@ sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
 dependencies {
-    compileOnly "org.embulk:embulk-api:0.10.30"
-    compileOnly "org.embulk:embulk-spi:0.10.30"
+    compileOnly "org.embulk:embulk-api:0.10.31"
+    compileOnly "org.embulk:embulk-spi:0.10.31"
 
-    compile("org.embulk:embulk-util-config:0.2.1") {
+    compile("org.embulk:embulk-util-config:0.3.1") {
         // They conflict with embulk-core. They are once excluded here,
         // and added explicitly with versions exactly the same with embulk-core:0.10.19.
         exclude group: "com.fasterxml.jackson.core", module: "jackson-annotations"
@@ -30,7 +30,7 @@ dependencies {
         exclude group: "javax.validation", module: "validation-api"
     }
     compile "org.embulk:embulk-util-timestamp:0.2.1"
-    compile('org.embulk:embulk-util-json:0.1.0') {
+    compile('org.embulk:embulk-util-json:0.1.1') {
         exclude group: "org.msgpack", module: "msgpack-core"
     }
 
@@ -51,14 +51,14 @@ dependencies {
     compile "org.embulk:embulk-util-timestamp:0.2.1"
 
     testCompile "junit:junit:4.13.2"
-    testCompile "org.embulk:embulk-core:0.10.30"
-    testCompile  "org.embulk:embulk-core:0.10.30:tests"
+    testCompile "org.embulk:embulk-core:0.10.31"
+    testCompile  "org.embulk:embulk-core:0.10.31:tests"
     // 0.10.29 eliminates embulk-standards
     //testCompile  "org.embulk:embulk-standards:0.10.29"
 
     // TODO: Remove them.
     // These `testCompile` are a tentative workaround. It will be covered in Embulk core's testing mechanism.
-    testCompile "org.embulk:embulk-deps:0.10.30"
+    testCompile "org.embulk:embulk-deps:0.10.31"
 }
 
 checkstyle {
@@ -84,19 +84,6 @@ embulkPlugin {
     type = "jsonpath"
 }
 
-publishing {
-    publications {
-        embulkPluginMaven(MavenPublication) {  // Publish it with "publishEmbulkPluginMavenPublicationToMavenRepository".
-            from components.java  // Must be "components.java". The dependency modification works only for it.
-        }
-    }
-    repositories {
-        maven {
-            url = "${project.buildDir}/mavenPublishLocal"
-        }
-    }
-}
-
 gem {
     authors = [ "Hiroyuki Sato","Takuma kanari" ]
     email = [ "hiroysato@gmail.com","chemtrails.t@gmail.com"]
@@ -133,3 +120,84 @@ tasks.withType(JavaCompile) {
 test {
   maxHeapSize = "2g"
 }
+
+java {
+    withJavadocJar()
+    withSourcesJar()
+}
+
+jar {
+    from rootProject.file("LICENSE.txt")
+}
+
+sourcesJar {
+    from rootProject.file("LICENSE.txt")
+}
+
+javadocJar {
+    from rootProject.file("LICENSE.txt")
+}
+
+publishing {
+    publications {
+        maven(MavenPublication) {
+            groupId = project.group
+            artifactId = project.name
+
+            from components.java  // Must be "components.java". The dependency modification works only for it.
+            // javadocJar and sourcesJar are added by java.withJavadocJar() and java.withSourcesJar() above.
+            // See: https://docs.gradle.org/current/javadoc/org/gradle/api/plugins/JavaPluginExtension.html
+
+            pom {  // https://central.sonatype.org/pages/requirements.html
+                packaging "jar"
+
+                name = project.name
+                description = project.description
+                url = "https://github.com/hiroyuki-sato/embulk-parser-jsonpath"
+
+                licenses {
+                    license {
+                        // http://central.sonatype.org/pages/requirements.html#license-information
+                        name = "MIT License"
+                        url = "http://www.opensource.org/licenses/mit-license.php"
+                    }
+                }
+
+                developers {
+                    developer {
+                        name = "Hiroyuki Sato"
+                        email = "hiroysato@gmail.com"
+                    }
+                }
+
+                scm {
+                    connection = "scm:git:git://github.com/hiroyuki-sato/embulk-parser-jsonpath.git"
+                    developerConnection = "scm:git:git@github.com:hiroyuki-sato/embulk-parser-jsonpath.git"
+                    url = "https://github.com/hiroyuki-sato/embulk-parser-jsonpath"
+                }
+            }
+        }
+    }
+
+    repositories {
+        maven {  // publishMavenPublicationToMavenCentralRepository
+            name = "mavenCentral"
+            if (project.version.endsWith("-SNAPSHOT")) {
+                url "https://s01.oss.sonatype.org/content/repositories/snapshots"
+            } else {
+                url "https://s01.oss.sonatype.org/service/local/staging/deploy/maven2"
+            }
+
+            credentials {
+                username = project.hasProperty("ossrhUsername") ? ossrhUsername : ""
+                password = project.hasProperty("ossrhPassword") ? ossrhPassword : ""
+            }
+        }
+    }
+}
+
+signing {
+    // https://docs.gradle.org/current/userguide/signing_plugin.html#sec:using_gpg_agent
+    useGpgCmd()
+    sign publishing.publications.maven
+}
diff --git a/gradle/dependency-locks/embulkPluginRuntime.lockfile b/gradle/dependency-locks/embulkPluginRuntime.lockfile
index 70c94f7..5b44ad2 100644
--- a/gradle/dependency-locks/embulkPluginRuntime.lockfile
+++ b/gradle/dependency-locks/embulkPluginRuntime.lockfile
@@ -9,9 +9,9 @@ com.jayway.jsonpath:json-path:2.4.0
 javax.validation:validation-api:1.1.0.Final
 net.minidev:accessors-smart:1.2
 net.minidev:json-smart:2.3
-org.embulk:embulk-util-config:0.2.1
+org.embulk:embulk-util-config:0.3.1
 org.embulk:embulk-util-file:0.1.3
-org.embulk:embulk-util-json:0.1.0
+org.embulk:embulk-util-json:0.1.1
 org.embulk:embulk-util-rubytime:0.3.2
 org.embulk:embulk-util-timestamp:0.2.1
 org.ow2.asm:asm:5.0.4