diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 30005b9..3f73789 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -29,4 +29,9 @@ jobs:
         run: ./gradlew :lib:publishToMavenLocal --dry-run
 
       - name: Validate Gradle Plugin Portal publishing setup
-        run: ./gradlew :lib:validatePlugins
\ No newline at end of file
+        run: ./gradlew :lib:publishPlugins --validate-only
+        env:
+          GRADLE_PUBLISH_KEY: ${{ secrets.GRADLE_PUBLISH_KEY }}
+          GRADLE_PUBLISH_SECRET: ${{ secrets.GRADLE_PUBLISH_SECRET }}
+          ORG_GRADLE_PROJECT_signingInMemoryKey: ${{ secrets.SIGNING_PRIVATE_KEY }}
+          ORG_GRADLE_PROJECT_signingInMemoryKeyPassword: ${{ secrets.SIGNING_PASSWORD }}
\ No newline at end of file
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 90f49ff..b01a426 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -32,8 +32,8 @@ jobs:
         env:
           GRADLE_PUBLISH_KEY: ${{ secrets.GRADLE_PUBLISH_KEY }}
           GRADLE_PUBLISH_SECRET: ${{ secrets.GRADLE_PUBLISH_SECRET }}
-          ORG_GRADLE_PROJECT_signingKey: ${{ secrets.SIGNING_PRIVATE_KEY }}
-          ORG_GRADLE_PROJECT_signingPassword: ${{ secrets.SIGNING_PASSWORD }}
+          ORG_GRADLE_PROJECT_signingInMemoryKey: ${{ secrets.SIGNING_PRIVATE_KEY }}
+          ORG_GRADLE_PROJECT_signingInMemoryKeyPassword: ${{ secrets.SIGNING_PASSWORD }}
 
       - name: Extract version from gradle.properties
         id: get_version
diff --git a/lib/build.gradle.kts b/lib/build.gradle.kts
index 68ffa1d..d4cc35e 100644
--- a/lib/build.gradle.kts
+++ b/lib/build.gradle.kts
@@ -1,5 +1,6 @@
 import com.vanniktech.maven.publish.GradlePlugin
 import com.vanniktech.maven.publish.JavadocJar
+import org.gradle.kotlin.dsl.signing
 import org.gradle.kotlin.dsl.withType
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 import org.jetbrains.kotlin.gradle.tasks.KotlinJvmCompile
@@ -9,6 +10,7 @@ plugins {
     alias(libs.plugins.maven.publish)
     alias(libs.plugins.gradle.publish)
     kotlin("jvm")
+    signing
 }
 
 dependencies {
@@ -79,3 +81,12 @@ gradlePlugin {
         }
     }
 }
+
+signing {
+    val signingInMemoryKey = project.findProperty("signingInMemoryKey") as String?
+    val signingInMemoryPassword = project.findProperty("signingInMemoryPassword") as String?
+    if (signingInMemoryKey != null && signingInMemoryPassword != null) {
+        useInMemoryPgpKeys(signingInMemoryKey, signingInMemoryPassword)
+        sign(publishing.publications)
+    }
+}