diff --git a/.github/workflows/ci-build.yml b/.github/workflows/ci-build.yml
index b7f0dec..6d02f42 100755
--- a/.github/workflows/ci-build.yml
+++ b/.github/workflows/ci-build.yml
@@ -4,31 +4,15 @@ on: [push, pull_request, workflow_dispatch]
 
 jobs:
   Build:
-    runs-on: [self-hosted, docker]
+    runs-on: ubuntu-latest
     permissions:
       checks: write
     timeout-minutes: 30
-    container:
-      image: ghcr.io/project-tsurugi/oltp-sandbox:ubuntu-22.04
-      credentials:
-        username: ${{ github.repository_owner }}
-        password: ${{ secrets.GHCR_PAT }}
-      volumes:
-        - ${{ vars.gradle_cache_dir }}:/root/.gradle
     defaults:
       run:
         shell: bash
     env:
       JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF8
-      GPR_USER: ${{ github.repository_owner }}
-      GPR_KEY: ${{ secrets.GHCR_PAT }}
-
-    services:
-      tsurugi:
-        image: ghcr.io/project-tsurugi/tsurugi:latest
-        credentials:
-          username: ${{ github.repository_owner }}
-          password: ${{ secrets.GHCR_PAT }}
 
     steps:
       - name: Setup_Java
@@ -60,9 +44,8 @@ jobs:
 
   Publish:
     uses: ./.github/workflows/ci-publish.yml
-    if: (contains(github.ref, '/tags/') || contains(github.ref, '/heads/master'))
+    if: github.repository_owner == 'project-tsurugi' && (contains(github.ref, '/tags/') || contains(github.ref, '/heads/master'))
     needs: Build
     secrets: inherit
     permissions:
       contents: write
-      packages: write
diff --git a/.github/workflows/ci-publish.yml b/.github/workflows/ci-publish.yml
index 4a05f67..cccd784 100755
--- a/.github/workflows/ci-publish.yml
+++ b/.github/workflows/ci-publish.yml
@@ -1,28 +1,19 @@
 name: Tanzawa-CI-Publish
 
 on: [workflow_dispatch, workflow_call]
+concurrency: ${{ github.workflow }}
 
 jobs:
   Publish:
-    runs-on: [self-hosted, docker]
+    runs-on: ubuntu-latest
     permissions:
       contents: write
-      packages: write
     timeout-minutes: 30
-    container:
-      image: ghcr.io/project-tsurugi/oltp-sandbox:ubuntu-22.04
-      credentials:
-        username: ${{ github.repository_owner }}
-        password: ${{ secrets.GHCR_PAT }}
-      volumes:
-        - ${{ vars.gradle_cache_dir }}:/root/.gradle
     defaults:
       run:
         shell: bash
     env:
       JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF8
-      GPR_USER: ${{ github.repository_owner }}
-      GPR_KEY: ${{ secrets.GHCR_PAT }}
 
     steps:
       - name: Setup_Java
@@ -39,6 +30,12 @@ jobs:
       - name: Publish
         run: |
           ./gradlew -i tanzawa-core:showTsubakuroManifest clean publish
+        env:
+          ST_OSSRH_USER: ${{ secrets.ST_OSSRH_USER }}
+          ST_OSSRH_PASSWORD: ${{ secrets.ST_OSSRH_PASSWORD }}
+          ORG_GRADLE_PROJECT_signingKeyId: ${{ secrets.SIGNING_KEY_ID }}
+          ORG_GRADLE_PROJECT_signingKey: ${{ secrets.SIGNING_KEY }}
+          ORG_GRADLE_PROJECT_signingPassword: ${{ secrets.SIGNING_PASSWORD }}
 
       - id: Create_Release
         name: Create_Release
diff --git a/buildSrc/src/main/groovy/tanzawa.java-conventions.gradle b/buildSrc/src/main/groovy/tanzawa.java-conventions.gradle
index 3e9316a..05d4e0f 100644
--- a/buildSrc/src/main/groovy/tanzawa.java-conventions.gradle
+++ b/buildSrc/src/main/groovy/tanzawa.java-conventions.gradle
@@ -12,24 +12,16 @@ if (hasProperty('mavenLocal')) {
 } else {
     repositories {
         maven {
-            url 'https://maven.pkg.github.com/project-tsurugi/*'
+            url 'https://s01.oss.sonatype.org/content/repositories/snapshots/'
             content {
                 includeGroupByRegex 'com\\.tsurugidb.*'
             }
-            credentials {
-                username findProperty('gpr.user') ?: System.getenv('GPR_USER')
-                password findProperty('gpr.key') ?: System.getenv('GPR_KEY')
-            }
         }
     }
 }
 
 repositories {
-    mavenCentral {
-        content {
-            excludeGroupByRegex 'com\\.tsurugidb.*'
-        }
-    }
+    mavenCentral()
 }
 
 configurations.all {
@@ -38,6 +30,7 @@ configurations.all {
 
 java {
     withSourcesJar()
+    withJavadocJar()
 }
 
 dependencies {
@@ -66,6 +59,8 @@ spotbugsMain {
 spotbugsTest.enabled = false
 checkstyleTest.enabled = false
 
+javadoc.failOnError = false
+
 jar {
     manifest.attributes (
         'Build-Timestamp': buildTimestamp,
diff --git a/buildSrc/src/main/groovy/tanzawa.libs-conventions.gradle b/buildSrc/src/main/groovy/tanzawa.libs-conventions.gradle
index 66fdf0c..88afc20 100644
--- a/buildSrc/src/main/groovy/tanzawa.libs-conventions.gradle
+++ b/buildSrc/src/main/groovy/tanzawa.libs-conventions.gradle
@@ -1,6 +1,7 @@
 plugins {
     id 'java-library'
     id 'java-test-fixtures'
+    id 'signing'
     id 'maven-publish'
 
     id 'tanzawa.java-conventions'
@@ -9,17 +10,48 @@ plugins {
 publishing {
     repositories {
         maven {
-            name 'GitHubPackages'
-            url 'https://maven.pkg.github.com/project-tsurugi/tanzawa'
+            name 'OSSRH'
+            def releasesRepoUrl = "https://s01.oss.sonatype.org/service/local/staging/deploy/maven2/"
+            def snapshotsRepoUrl = "https://s01.oss.sonatype.org/content/repositories/snapshots/"
+            url version.endsWith('-SNAPSHOT') ? snapshotsRepoUrl : releasesRepoUrl
             credentials {
-                username findProperty('gpr.user') ?: System.getenv('GPR_USER')
-                password findProperty('gpr.key') ?: System.getenv('GPR_KEY')
+                username findProperty('st.ossrh.user') ?: System.getenv('ST_OSSRH_USER')
+                password findProperty('st.ossrh.password') ?: System.getenv('ST_OSSRH_PASSWORD')
             }
         }
     }
     publications {
         mavenJava(MavenPublication) {
             from components.java
+            pom {
+                name = 'Tanzawa'
+                description = 'Tsurugi SQL console engine is a core library of Tsurugi SQL console.'
+                url = 'https://github.com/project-tsurugi/tanzawa'
+                licenses {
+                    license {
+                        name = 'The Apache License, Version 2.0'
+                        url = 'http://www.apache.org/licenses/LICENSE-2.0.txt'
+                    }
+                }
+                developers {
+                    developer {
+                        id = 'project-tsurugi'
+                    }
+                }
+                scm {
+                    connection = 'scm:git:https://github.com/project-tsurugi/tanzawa.git'
+                    developerConnection = 'scm:git:https://github.com/project-tsurugi/tanzawa.git'
+                    url = 'https://github.com/project-tsurugi/tanzawa'
+                }
+            }
         }
     }
 }
+
+signing {
+    def signingKeyId = findProperty("signingKeyId")
+    def signingKey = findProperty("signingKey")
+    def signingPassword = findProperty("signingPassword")
+    useInMemoryPgpKeys(signingKey, signingPassword)
+    sign publishing.publications.mavenJava
+}