Lock Gradle Dependencies for Reproducible Release Builds

Separate declarations from resolution

A build can declare a range or a platform while resolving a concrete set of versions. The Gradle locking guide explains how locking captures that resolved state for enabled configurations.

A version catalog organizes requested versions; it does not replace locking of the actual dependency graph.

Enable locking intentionally

An illustrative Kotlin DSL configuration is:

dependencyLocking {
    lockAllConfigurations()
}

Choose configuration scope according to the project. Generate lock state using the relevant resolving tasks and Gradle's --write-locks option. Merely enabling the block without resolving the intended configurations does not establish complete lock coverage.

Review updates as dependency changes

Do not regenerate and commit every lockfile automatically to make CI green. That defeats the review boundary locking is meant to provide.

Keep reproducibility broader than libraries

Pin the Gradle wrapper and relevant build plugins, document the JDK and use controlled repositories. Native toolchains, generated sources and environment-dependent tasks can still make output differ even when dependency versions are locked.

Locking also does not validate a downloaded artifact's checksum; dependency verification addresses that separate concern.

Validate from a clean environment

Resolve and build in CI using the committed lock state. Confirm that an unexpected version change fails according to the project's locking mode rather than being silently accepted.

APKLint's Gradle Dependency Checker can help review declarations, but it cannot reconstruct the complete resolved graph or certify the lockfile from a snippet. Keep the actual lockfiles and CI resolution evidence with the release.