diff --git a/.github/workflows/publish-release.yml b/.github/workflows/publish-release.yml
index c442ad6..e45f8b6 100644
--- a/.github/workflows/publish-release.yml
+++ b/.github/workflows/publish-release.yml
@@ -9,6 +9,8 @@ on:
 env:
   MAVEN_USERNAME: ${{ secrets.MAVEN_USERNAME }}
   MAVEN_PASSWORD: ${{ secrets.MAVEN_PASSWORD }}
+  ORG_GRADLE_PROJECT_signingKey: ${{ secrets.OSSRH_GPG_SECRET_KEY }}
+  ORG_GRADLE_PROJECT_signingPassword: ${{ secrets.OSSRH_GPG_SECRET_KEY_PASSWORD }}
 
 jobs:
   deploy:
diff --git a/build.gradle.kts b/build.gradle.kts
index b64eed2..4998283 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -3,6 +3,7 @@ plugins {
     id("com.google.protobuf") version "0.9.2" apply false
     `maven-publish`
     id("org.jlleitschuh.gradle.ktlint") version "11.3.1"
+    signing
 }
 
 group = "io.github.mscheong01"
@@ -115,3 +116,12 @@ tasks.create("updateVersion") {
         }
     }
 }
+
+if (project.hasProperty("releaseVersion")) {
+    signing {
+        val signingKey: String? by project
+        val signingPassword: String? by project
+        useInMemoryPgpKeys(signingKey, signingPassword)
+        sign(publishing.publications)
+    }
+}
diff --git a/core/build.gradle.kts b/core/build.gradle.kts
index 633523c..923fb2d 100644
--- a/core/build.gradle.kts
+++ b/core/build.gradle.kts
@@ -11,6 +11,7 @@ dependencies {
 
 java {
     withSourcesJar()
+    withJavadocJar()
 }
 
 publishing {
diff --git a/example/build.gradle.kts b/example/build.gradle.kts
index 0624693..14e8e35 100644
--- a/example/build.gradle.kts
+++ b/example/build.gradle.kts
@@ -28,7 +28,6 @@ dependencies {
 }
 
 protobuf {
-
     protoc {
         artifact = "com.google.protobuf:protoc:${rootProject.ext["protobufVersion"]}"
     }
diff --git a/generator/build.gradle.kts b/generator/build.gradle.kts
index 6881d38..d16421c 100644
--- a/generator/build.gradle.kts
+++ b/generator/build.gradle.kts
@@ -4,6 +4,10 @@ plugins {
     application
 }
 
+java {
+    withJavadocJar()
+}
+
 application {
     mainClass.set("io.github.mscheong01.krotodc.MainExecutor")
 }