dependency-check-updates

Dependency Check & Update — a fast, multi-ecosystem dependency updater written in Rust.

Like npm-check-updates, but for every language.

$ dcu
Checking Cargo.toml
 toml_edit  0.22  ->  0.25.4

Checking .github/workflows/CI.yml
 actions/checkout    v4  ->  v5
 actions/setup-node  v4  ->  v5

Run dcu -u to upgrade

dcu is a short alias installed alongside dependency-check-updates. Both commands are identical — use whichever you prefer.

Quick Start (Zero Install)

No install needed — run straight from your package manager's ephemeral runner:

# Node.js ecosystem
bunx @dependency-check-updates/cli
npx  @dependency-check-updates/cli

# Python ecosystem
uvx dependency-check-updates
pipx run dependency-check-updates

All four accept the same flags described in Usage.

Features

• Multi-ecosystem — package.json, Cargo.toml, pyproject.toml, and .github/workflows/*.yml all handled by a single binary
• Format-preserving — surgical byte-range patching for JSON / YAML; toml_edit for TOML. Your indentation, comments, trailing newlines, and key ordering stay intact
• Fast — concurrent registry lookups across all manifests via futures::join_all
• Smart range checking — skips false positives where the resolved version already satisfies the current range (^3 already covers 3.5.1)
• Deep scan — -d recursively finds manifests in monorepos, respecting .gitignore
• ncu-compatible UX — the same flags you already know from npm-check-updates
• Short alias — type dcu instead of dependency-check-updates; both are installed by every distribution
• CI-friendly — -e 2 exits non-zero when updates exist; --format json emits machine-readable output

Supported Ecosystems

Ecosystem	Manifest	Registry	Package
Node.js	package.json	npm	@dependency-check-updates/cli
Rust	Cargo.toml	crates.io	dependency-check-updates
Python	pyproject.toml	PyPI	dependency-check-updates
GitHub Actions	.github/workflows/*.yml, action.yml	GitHub Tags API	(built-in)

GitHub Actions specifics

• Discovers every *.yml / *.yaml under .github/workflows/ and any action.yml / action.yaml at the repo root automatically. Composite actions nested under .github/actions/**/ are picked up with -d.
• Scans uses: owner/repo@ref directives. Refs without version digits — @main, @master, branch names, and full commit SHAs — are left untouched on purpose; they pin a moving target intentionally.
• Tag prefix is preserved: @v5 updates to @v6 (major float), @v5.1.0 updates to @v6.0.0 (full precision). Bare semver without the v (@1.2.3, @5) is recognised and tracked the same way.
• Duplicate rows are collapsed in the output — if actions/checkout@v5 appears in 12 jobs, you see one row, not twelve. The patch engine still updates every occurrence in the file.
• Rate limit: unauthenticated runs use GitHub's 60 req/hr ceiling. Hitting it produces an explicit error pointing to the fix — set GITHUB_TOKEN (or GH_TOKEN) in your environment to raise the limit to 5 000 req/hr.
• Tag fetch is bounded to the first 100 tags per action (newest-first). This comfortably covers every mainstream action; deliberately not paginating keeps API consumption predictable so deep scans don't spike into the rate-limit ceiling.

Installation

Every distribution below ships the exact same binary. Pick whichever matches your toolchain.

Rust (Cargo)

cargo install dependency-check-updates

Installs commands: dependency-check-updates and dcu (short alias).

Node.js (npm / bun / pnpm / yarn)

Permanent global install:

npm  install   -g @dependency-check-updates/cli
bun  add       -g @dependency-check-updates/cli
pnpm add       -g @dependency-check-updates/cli
yarn global add   @dependency-check-updates/cli

Installs commands: dependency-check-updates and dcu (short alias).

One-off execution (no install):

bunx @dependency-check-updates/cli [flags]
npx  @dependency-check-updates/cli [flags]

Python (pip / uv / pipx)

Permanent isolated install:

pipx install dependency-check-updates
uv tool install dependency-check-updates

Install inside a virtualenv:

pip    install dependency-check-updates
uv pip install dependency-check-updates

Installs commands: dependency-check-updates and dcu (short alias).

One-off execution (no install):

uvx dependency-check-updates [flags]
pipx run dependency-check-updates [flags]

Usage

Run from a directory containing at least one of package.json, Cargo.toml, pyproject.toml, or .github/workflows/*.yml. Every supported manifest in the current directory is auto-detected.

All examples below use the short dcu alias. The long form dependency-check-updates works identically.

Basic

# Check for outdated dependencies (read-only, nothing is written)
dcu

# Apply updates in place (format-preserving)
dcu -u

# Recursively scan subdirectories (monorepo-friendly, respects .gitignore)
dcu -d
dcu -d -u

All Options

Usage: dcu [OPTIONS] [FILTER]...

Flag	Description	Default
[FILTER]...	Positional package names to include (allowlist; repeatable)	(all)
-u, --upgrade	Write updated versions back to the manifest file	off
-d, --deep	Recursively scan subdirectories, respecting .gitignore	off
-t, --target <LEVEL>	Version target: patch · minor · latest · newest · greatest	latest
-x, --reject <PATTERN>	Exclude packages by name (repeatable)	—
--manifest <PATH>	Operate on a single specific manifest file	(auto)
--format <FORMAT>	Output format: table or json	table
-e, --error-level <N>	1 = always exit 0 · 2 = exit 1 when updates exist (CI gate)	1
-v, --verbose	Increase verbosity: -v info · -vv debug · -vvv trace	off
-h, --help	Print help	—
-V, --version	Print version	—

-t, --target values

Value	Behavior
patch	Only patch bumps (e.g., 1.0.1 → 1.0.2)
minor	Patch + minor bumps (e.g., 1.0.0 → 1.1.0)
latest	Latest stable version; prereleases are skipped (default)
newest	Most recently published version by publish date
greatest	Highest version number, including prereleases

Examples

# Target specific update level
dcu -t patch           # patch only
dcu -t minor           # minor + patch
dcu -t latest          # default: latest stable
dcu -t greatest        # include prereleases

# Filter packages — positional args act as an include-list
dcu react eslint       # only check react and eslint
dcu -x typescript      # exclude typescript
dcu -x typescript -x lodash

# Filter GitHub Actions by owner — same filter syntax works across ecosystems
dcu actions            # only actions/checkout, actions/setup-node, …

# Operate on a specific manifest
dcu --manifest path/to/Cargo.toml
dcu --manifest apps/web/package.json
dcu --manifest .github/workflows/CI.yml

# Machine-readable output for scripting/CI
dcu --format json

# CI gate: exit 1 if any updates are available
dcu -e 2

# Verbose logging (accumulating)
dcu -v    # info
dcu -vv   # debug
dcu -vvv  # trace

# Combining flags — recursive, patch-only upgrade in a monorepo
dcu -d -u -t patch

# GitHub Actions: pin a higher rate limit by exporting a token
GITHUB_TOKEN=ghp_xxx dcu -d -u

Zero-Install Examples

Every example above works identically via the ephemeral runners, too:

bunx @dependency-check-updates/cli                  # check
bunx @dependency-check-updates/cli -u               # apply updates
bunx @dependency-check-updates/cli -d -t minor      # deep scan, minor bumps
bunx @dependency-check-updates/cli react eslint     # filter
npx  @dependency-check-updates/cli --format json

uvx dependency-check-updates
uvx dependency-check-updates -d -u -t patch
pipx run dependency-check-updates --format json

Architecture

Follows the changepacks pattern — one crate per language ecosystem, with bridge crates for cross-language distribution:

.
├── crates/
│   ├── cli/           # Binary + async CLI orchestration (installs `dcu` + `dependency-check-updates`)
│   ├── core/          # Shared traits (ManifestHandler, RegistryClient, Scanner)
│   ├── node/          # Node.js: package.json parser + npm registry
│   ├── rust/          # Rust: Cargo.toml parser (toml_edit) + crates.io
│   ├── python/        # Python: pyproject.toml parser (toml_edit) + PyPI
│   └── github/        # GitHub Actions: workflow YAML parser + GitHub Tags API
├── bridge/
│   ├── node/          # napi-rs N-API binding → npm: @dependency-check-updates/cli
│   └── python/        # maturin bin binding → PyPI: dependency-check-updates
├── Cargo.toml         # Workspace root
└── package.json       # Bun workspace (build/lint/test scripts)

Format Preservation

• JSON (package.json): Surgical byte-range replacement — finds exact byte offsets of version values and replaces only those bytes. Indent, line endings, trailing newline, and key ordering are preserved byte-for-byte.
• TOML (Cargo.toml, pyproject.toml): toml_edit document model preserves comments, table ordering, inline-table formatting, and whitespace.
• YAML (.github/workflows/*.yml, action.yml): Line-based uses: scanning with byte-range replacement of only the @ref portion. Anchors, comments, blank lines, and unrelated @main / @<sha> pins are never touched.

Shared Traits

Each ecosystem crate implements two core traits from dependency-check-updates-core:

• ManifestHandler — parse manifests, collect dependencies, apply format-preserving updates
• RegistryClient — resolve versions from package registries with concurrency control

Range Satisfaction

Before reporting an update, the resolver checks whether the selected version already satisfies the current range (e.g., ^3 already covers 3.5.1). This eliminates the false positives that plague naive string comparison.

Development

Build prerequisites:

• Rust 1.85+ (stable toolchain)
• Bun 1.0+ (or Node.js 18+ with npm)
• Python 3.11+ with maturin (only for the Python wheel step)
• Windows: Visual Studio 2022 Build Tools (MSVC linker)

# First-time setup: install JS toolchain deps (@napi-rs/cli, etc.)
bun install

# Build everything (native CLI + napi .node + maturin wheel)
bun run build

# Dev build (faster, unoptimized)
bun run build:dev

# Lint (cargo clippy + rustfmt + bun workspace lints)
bun run lint
bun run lint:fix

# Test (cargo test --workspace + bun workspace tests)
bun run test

# Run CLI from source
bun run run -- --help
bun run run -- --manifest Cargo.toml -v
bun run run:release -- -d

Inspirations

• npm-check-updates — the original ncu that inspired this tool's UX and flag design
• changepacks — the workspace architecture pattern (crates/* + bridge/*), multi-language bridge distribution via napi-rs and maturin, and the overall project structure

License

MIT