Gradle version plugin release version working fine

gistfile1.txt

suztomo@suxtomo24:~/hello-gradle-version-plugin$ cat build.gradle 
plugins {
    id 'java'
    id "com.github.ben-manes.versions" version "0.27.0"
}

group 'suztomo'
version '1.0-SNAPSHOT'

sourceCompatibility = 1.8

repositories {
    mavenCentral()
}

dependencies {
    compile "com.google.cloud.bigtable:bigtable-client-core:1.8.0"
}
suztomo@suxtomo24:~/hello-gradle-version-plugin$ ./gradlew dependencyUpdates -Drevision=release

> Task :dependencyUpdates

------------------------------------------------------------
: Project Dependency Updates (report to plain text file)
------------------------------------------------------------

The following dependencies are using the latest release version:
 - com.github.ben-manes.versions:com.github.ben-manes.versions.gradle.plugin:0.27.0

The following dependencies have later release versions:
 - com.google.cloud.bigtable:bigtable-client-core [1.8.0 -> 1.12.1]
     https://cloud.google.com/bigtable/

Gradle release-candidate updates:
 - Gradle: [5.2.1 -> 6.0]

Generated report file build/dependencyUpdates/report.txt

BUILD SUCCESSFUL in 0s
1 actionable task: 1 executed