diff --git a/README.md b/README.md
index b76df7f..bc3e5e8 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # `open-turo/actions-node`
 
-GitHub Actions for `node` based repositories. It uses `yarn` as package manager.
+GitHub Actions for `node` based repositories. It supports `bun`, `pnpm`, `yarn`, and `npm` as package managers.
 
 [![Release](https://img.shields.io/github/v/release/open-turo/actions-node)](https://github.com/open-turo/actions-node/releases/)
 [![Tests pass/fail](https://img.shields.io/github/workflow/status/open-turo/actions-node/CI)](https://github.com/open-turo/actions-node/actions/)
@@ -15,7 +15,7 @@ GitHub Actions for `node` based repositories. It uses `yarn` as package manager.
 
 ### action: [`lint`](./lint)
 
-Lint will run pre-commit linters and eslint against the consumer repository, optionally checking out, and installing node, yarn and any other required tools with [action-setup-tools](https://github.com/open-turo/action-setup-tools).
+Lint will run pre-commit linters and eslint against the consumer repository, optionally checking out, and installing node, bun/pnpm/yarn/npm and any other required tools with [action-setup-tools](https://github.com/open-turo/action-setup-tools).
 
 See usage [here](./lint/README.md#usage).
 
diff --git a/build/action.yaml b/build/action.yaml
index 7388db1..1dd3ddb 100644
--- a/build/action.yaml
+++ b/build/action.yaml
@@ -52,3 +52,17 @@ runs:
       env:
         NPM_AUTH_TOKEN: ${{ inputs.npm-auth-token }}
         NPM_TOKEN: ${{ inputs.npm-token }}
+    - name: Run build script (pnpm)
+      if: steps.install_dependencies.outputs.package-manager == 'pnpm'
+      shell: bash
+      run: pnpm ${{ inputs.build-script }}
+      env:
+        NPM_AUTH_TOKEN: ${{ inputs.npm-auth-token }}
+        NPM_TOKEN: ${{ inputs.npm-token }}
+    - name: Run build script (bun)
+      if: steps.install_dependencies.outputs.package-manager == 'bun'
+      shell: bash
+      run: bun run ${{ inputs.build-script }}
+      env:
+        NPM_AUTH_TOKEN: ${{ inputs.npm-auth-token }}
+        NPM_TOKEN: ${{ inputs.npm-token }}
diff --git a/install-dependencies/README.md b/install-dependencies/README.md
index 89d325d..8079a8e 100644
--- a/install-dependencies/README.md
+++ b/install-dependencies/README.md
@@ -42,8 +42,7 @@ jobs:
 ## Notes
 
 - By default, this action will perform actions/checkout as its first step.
-- This action checks for a `yarn.lock` file to figure out which package manager
-  to use to install dependencies; it supports `npm` and `yarn`.
+- This action checks for `bun.lock`, `pnpm-lock.yaml`, `yarn.lock`, and `package-lock.json` to determine which package manager to use to install dependencies; it supports `bun`, `pnpm`, `yarn`, and `npm` (with priority given to bun, then pnpm, then yarn, then npm).
 
 <!-- prettier-ignore-start -->
 <!-- action-docs-inputs source="action.yaml" -->
@@ -64,7 +63,7 @@ jobs:
 | name | description |
 | --- | --- |
 | `cache-hit` | <p>Whether the cache was hit when installing dependencies</p> |
-| `package-manager` | <p>The package manager used to install dependencies</p> |
+| `package-manager` | <p>The package manager used to install dependencies. Falls back to NPM by default.</p> |
 <!-- action-docs-outputs source="action.yaml" -->
 <!-- action-docs-runs source="action.yaml" -->
 ## Runs
diff --git a/install-dependencies/action.yaml b/install-dependencies/action.yaml
index 24cba6c..bb73b32 100644
--- a/install-dependencies/action.yaml
+++ b/install-dependencies/action.yaml
@@ -26,8 +26,8 @@ outputs:
     description: Whether the cache was hit when installing dependencies
     value: ${{ steps.read_cache.outputs.cache-hit }}
   package-manager:
-    description: The package manager used to install dependencies
-    value: ${{ steps.check_yarn_lock.outputs.files_exists == 'true' && 'yarn' || 'npm' }}
+    description: The package manager used to install dependencies. Falls back to NPM by default.
+    value: ${{ steps.check_bun_lock.outputs.files_exists == 'true' && 'bun' || (steps.check_pnpm_lock.outputs.files_exists == 'true' && 'pnpm' || (steps.check_yarn_lock.outputs.files_exists == 'true' && 'yarn') || 'npm') }}
 runs:
   using: composite
   steps:
@@ -38,15 +38,30 @@ runs:
         fetch-depth: 0
     - name: Setup tools
       uses: open-turo/action-setup-tools@v3
+    - name: Check for package-lock.json
+      id: check_npm_lock
+      uses: andstor/file-existence-action@v3
+      with:
+        files: package-lock.json
+    - name: Check for pnpm-lock.yaml
+      id: check_pnpm_lock
+      uses: andstor/file-existence-action@v3
+      with:
+        files: pnpm-lock.yaml
     - name: Check for yarn.lock
       id: check_yarn_lock
       uses: andstor/file-existence-action@v3
       with:
         files: yarn.lock
+    - name: Check for bun.lock
+      id: check_bun_lock
+      uses: andstor/file-existence-action@v3
+      with:
+        files: bun.lock
     - name: Compute lockfile hash
       if: inputs.s3-bucket-name != ''
       id: lockfile_hash
-      run: echo "hash=${{ steps.check_yarn_lock.outputs.files_exists == 'true' && hashFiles('**/yarn.lock') || hashFiles('**/package-lock.json') }}" >> $GITHUB_OUTPUT
+      run: echo "hash=${{ steps.check_bun_lock.outputs.files_exists == 'true' && hashFiles('**/bun.lock') || (steps.check_pnpm_lock.outputs.files_exists == 'true' && hashFiles('**/pnpm-lock.yaml') || (steps.check_yarn_lock.outputs.files_exists == 'true' && hashFiles('**/yarn.lock') || hashFiles('**/package-lock.json'))) }}" >> $GITHUB_OUTPUT
       shell: bash
     - name: Load cached node_modules if available
       if: inputs.s3-bucket-name != ''
@@ -61,6 +76,18 @@ runs:
       env:
         AWS_REGION: ${{ inputs.s3-bucket-region }}
         cache-name: ${{ github.event.repository.name }}/cache-node-modules
+    - name: Install dependencies (bun)
+      if: steps.check_bun_lock.outputs.files_exists == 'true'
+      shell: bash
+      run: bun install --frozen-lockfile
+      env:
+        NPM_AUTH_TOKEN: ${{ inputs.npm-auth-token }}
+    - name: Install dependencies (pnpm)
+      if: steps.check_pnpm_lock.outputs.files_exists == 'true'
+      shell: bash
+      run: pnpm install --frozen-lockfile
+      env:
+        NPM_AUTH_TOKEN: ${{ inputs.npm-auth-token }}
     - name: Install dependencies (yarn)
       if: steps.check_yarn_lock.outputs.files_exists == 'true'
       shell: bash
@@ -68,7 +95,7 @@ runs:
       env:
         NPM_AUTH_TOKEN: ${{ inputs.npm-auth-token }}
     - name: Install dependencies (npm)
-      if: steps.check_yarn_lock.outputs.files_exists == 'false'
+      if: steps.check_npm_lock.outputs.files_exists == 'true'
       shell: bash
       run: npm ci
       env:
diff --git a/lint/action.yaml b/lint/action.yaml
index 5be5a85..ddd8915 100644
--- a/lint/action.yaml
+++ b/lint/action.yaml
@@ -59,6 +59,22 @@ runs:
         NPM_AUTH_TOKEN: ${{ inputs.npm-auth-token }}
         NPM_TOKEN: ${{ inputs.npm-token }}
       run: yarn $LINT_SCRIPT
+    - name: Run lint script (pnpm)
+      if: steps.install_dependencies.outputs.package-manager == 'pnpm'
+      shell: bash
+      env:
+        LINT_SCRIPT: ${{ inputs.lint-script }}
+        NPM_AUTH_TOKEN: ${{ inputs.npm-auth-token }}
+        NPM_TOKEN: ${{ inputs.npm-token }}
+      run: pnpm $LINT_SCRIPT
+    - name: Run lint script (bun)
+      if: steps.install_dependencies.outputs.package-manager == 'bun'
+      shell: bash
+      env:
+        LINT_SCRIPT: ${{ inputs.lint-script }}
+        NPM_AUTH_TOKEN: ${{ inputs.npm-auth-token }}
+        NPM_TOKEN: ${{ inputs.npm-token }}
+      run: bun run $LINT_SCRIPT
     - name: Check for .pre-commit-config file
       id: check_pre_commit_config
       uses: andstor/file-existence-action@v3
diff --git a/test/action.yaml b/test/action.yaml
index f13f1d6..1a94b14 100644
--- a/test/action.yaml
+++ b/test/action.yaml
@@ -53,3 +53,17 @@ runs:
       env:
         NPM_AUTH_TOKEN: ${{ inputs.npm-auth-token }}
         NPM_TOKEN: ${{ inputs.npm-token }}
+    - name: Run tests (pnpm)
+      if: steps.install_dependencies.outputs.package-manager == 'pnpm'
+      shell: bash
+      run: pnpm test ${{ inputs.test-flags }}
+      env:
+        NPM_AUTH_TOKEN: ${{ inputs.npm-auth-token }}
+        NPM_TOKEN: ${{ inputs.npm-token }}
+    - name: Run tests (bun)
+      if: steps.install_dependencies.outputs.package-manager == 'bun'
+      shell: bash
+      run: bun test ${{ inputs.test-flags }}
+      env:
+        NPM_AUTH_TOKEN: ${{ inputs.npm-auth-token }}
+        NPM_TOKEN: ${{ inputs.npm-token }}