diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 40ee532..384b972 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -197,7 +197,6 @@ jobs:
       - name: Install from default registry
         run: |
           output=$(bun add is-odd --verbose --force 2>&1)
-          echo "$output"
 
           if echo "$output" | grep -q "HTTP/1.1 GET https://registry.npmjs.org/is-odd"; then
             echo "Successfully installed from default registry"
@@ -208,10 +207,9 @@ jobs:
 
       - name: Install from @types registry
         run: |
-          output=$(bun add @types/bun --verbose --force)
-          echo "$output"
+          output=$(bun add @types/bun --verbose --force 2>&1)
 
-          if echo "$output" | grep -q "HTTP/1.1 GET https://registry.yarnpkg.com/@types/bun"; then
+          if echo "$output" | grep -q "HTTP/1.1 GET https://registry.yarnpkg.com/@types%2fbun"; then
             echo "Successfully installed from @types registry"
           else
             echo "Failed to install from @types registry"
diff --git a/README.md b/README.md
index 004ad3c..b08036c 100644
--- a/README.md
+++ b/README.md
@@ -18,24 +18,39 @@ Download, install, and setup [Bun](https://bun.sh) in GitHub Actions.
     bun-version-file: ".bun-version"
 ```
 
-### Using a custom NPM registry
+## Using custom registries
+
+You can configure multiple package registries using the `registries` input. This supports both default and scoped registries with various authentication methods.
+
+### Registry configuration
 
 ```yaml
 - uses: oven-sh/setup-bun@v2
   with:
-    registry-url: "https://npm.pkg.github.com/"
-    scope: "@foo"
-```
+    registries: |
+      https://registry.npmjs.org/
+      @myorg:https://npm.pkg.github.com/|$GITHUB_TOKEN
+      @internal:https://username:$INTERNAL_PASSWORD@registry.internal.com/
 
-If you need to authenticate with a private registry, you can set the `BUN_AUTH_TOKEN` environment variable.
-
-```yaml
-- name: Install Dependencies
+- name: Install dependencies
   env:
-    BUN_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
-  run: bun install --frozen-lockfile
+    GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    INTERNAL_PASSWORD: ${{ secrets.INTERNAL_PASSWORD }}
+  run: bun install
 ```
 
+#### Registry format options
+
+- **Default registry**: `https://registry.npmjs.org/`
+- **Default registry with token**: `https://registry.npmjs.org/|$TOKEN`
+- **Scoped registry**: `@scope:https://registry.example.com/`
+- **Scoped registry with token**: `@scope:https://registry.example.com/|$TOKEN`
+- **Scoped registry with URL credentials**: `@scope:https://username:$PASSWORD@registry.example.com/`
+
+> **Note**: When using authentication, make sure to set the corresponding environment variables in your workflow steps that need access to the registries.
+
+For more information about configuring registries in Bun, see the [official documentation](https://bun.sh/docs/install/registries).
+
 ### Override download url
 
 If you need to override the download URL, you can use the `bun-download-url` input.
diff --git a/action.yml b/action.yml
index eb56910..e60cfde 100644
--- a/action.yml
+++ b/action.yml
@@ -17,15 +17,23 @@ inputs:
   bun-download-url:
     description: Override the URL to download Bun from. This skips version resolution and verifying AVX2 support.
     required: false
+  registries:
+    description: |
+      List of package registries with authentication support. Format:
+      - Default registry: https://registry.npmjs.org/
+      - Default with token: https://registry.npmjs.org/|token
+      - Scoped registry: @scope:https://registry.example.com/
+      - Scoped with token: @scope:https://registry.example.com/|token
+      - Scoped with credentials: @scope:https://user:pass@registry.example.com/
+    required: false
   registry-url:
     required: false
     description: The URL of the package registry to use for installing Bun. Set the $BUN_AUTH_TOKEN environment variable to authenticate with the registry.
+    deprecationMessage: "Use 'registries' input instead."
   scope:
     required: false
     description: "The scope for authenticating with the package registry."
-  registries:
-    required: false
-    description: "An list of package registries for authenticating with the package registry."
+    deprecationMessage: "Use 'registries' input instead."
   no-cache:
     required: false
     type: boolean
diff --git a/src/index.ts b/src/index.ts
index 716755d..360eb91 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -9,6 +9,8 @@ if (!process.env.RUNNER_TEMP) {
 }
 
 const registries = parseRegistries(getInput("registries"));
+
+// Backwards compatibility for the `registry-url` and `scope` inputs
 const registryUrl = getInput("registry-url");
 const scope = getInput("scope");