@@ -8,10 +8,6 @@ on:
       slug:
         type: string
         description: 'The slug of the plugin to deploy'
-      version:
-        type: string
-        description: 'The version of the plugin to deploy'
-
 jobs:
   release:
     name: Prepare Deployment
@@ -21,12 +17,30 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v3
+      - name: Setup Node.js (.nvmrc)
+        uses: actions/setup-node@v3
+        with:
+          node-version-file: '.nvmrc'
+          cache: npm
+      - name: Install npm dependencies
+        run: npm ci
+      - name: Get plugin version
+        id: get-version
+        if: ${{ github.event_name == 'workflow_dispatch' }}
+        run: |
+          echo "version=$(node ./bin/plugin/cli.js get-plugin-version --slug=${{ inputs.slug }})" >> $GITHUB_OUTPUT
       - name: Set matrix
         id: set-matrix
         run: |
           if ${{ github.event_name == 'workflow_dispatch' }}; then
-            # Set the manual input values in JSON format for use in the matrix.
-            echo "matrix={\"include\":[{\"slug\":\"${{ inputs.slug }}\",\"version\":\"${{ inputs.version }}\"}]}" >> $GITHUB_OUTPUT
+            result=$(echo "${{ steps.get-version.outputs.version }}" | awk '/^(\*|[0-9]+(\.[0-9]+){0,2}(-[a-zA-Z0-9.]+)?)$/ {print "Matched"}')
+            if [[ -n "$result" ]]; then
+              # Set the manual input values in JSON format for use in the matrix.
+              echo "matrix={\"include\":[{\"slug\":\"${{ inputs.slug }}\",\"version\":\"${{ steps.get-version.outputs.version }}\"}]}" >> $GITHUB_OUTPUT
+            else
+              echo "The ${{ inputs.slug }} module slug is missing in the file plugins.json."
+              exit 1
+            fi
           else
             # Load the JSON file and parse from "{name: {slug, version}, ...}" to "include: [{ name, slug, version }, ...]"
             # for use in the matrix.
 
@@ -46,6 +46,10 @@ const {
 	handler: testPluginsHandler,
 	options: testPluginsOptions,
 } = require( './commands/test-plugins' );
+const {
+	handler: getPluginVersionHandler,
+	options: getPluginVersionOptions,
+} = require( './commands/get-plugin-version' );
 const {
 	handler: enabledModulesHandler,
 	options: enabledModulesOptions,
@@ -92,6 +96,13 @@ withOptions( program.command( 'test-standalone-plugins' ), testPluginsOptions )
 	)
 	.action( catchException( testPluginsHandler ) );
 
+withOptions( program.command( 'get-standalone-plugin-version' ), getPluginVersionOptions )
+	.alias( 'get-plugin-version' )
+	.description(
+		'Get standalone plugin version'
+	)
+	.action( catchException( getPluginVersionHandler ) );
+
 withOptions(
 	program.command( 'default-enabled-modules' ),
 	enabledModulesOptions
 
@@ -0,0 +1,76 @@
+/**
+ * External dependencies
+ */
+const fs = require( 'fs' );
+const path = require( 'path' );
+
+/**
+ * Internal dependencies
+ */
+const { log } = require( '../lib/logger' );
+
+exports.options = [
+	{
+		argname: '-s, --slug <slug>',
+		description: 'Standalone plugin slug to get version from plugins.json',
+	},
+];
+
+/**
+ * Command to get the plugin version based on the slug.
+ *
+ * @param {Object} opt Command options.
+ */
+exports.handler = async ( opt ) => {
+	doRunGetPluginVersion( {
+		pluginsJsonFile: 'plugins.json', // Path to plugins.json file.
+		slug: opt.slug, // Plugin slug.
+	} );
+};
+
+/**
+ * Returns the match plugin version from plugins.json file.
+ *
+ * @param {Object} settings Plugin settings.
+ */
+function doRunGetPluginVersion( settings ) {
+	if ( settings.slug === undefined ) {
+		throw Error( 'A slug must be provided via the --slug (-s) argument.' );
+	}
+
+	const pluginsFile = path.join( '.', settings.pluginsJsonFile );
+
+	// Buffer contents of plugins JSON file.
+	let pluginsFileContent = '';
+
+	try {
+		pluginsFileContent = fs.readFileSync( pluginsFile, 'utf-8' );
+	} catch ( e ) {
+		throw Error( `Error reading file at "${ pluginsFile }": ${ e }` );
+	}
+
+	// Validate that the plugins JSON file contains content before proceeding.
+	if ( ! pluginsFileContent ) {
+		throw Error( `Contents of file at "${ pluginsFile }" could not be read, or are empty.` );
+	}
+
+	const plugins = JSON.parse( pluginsFileContent );
+
+	// Check for valid and not empty object resulting from plugins JSON file parse.
+	if (
+		'object' !== typeof plugins ||
+		0 === Object.keys( plugins ).length
+	) {
+		throw Error( `File at "${ pluginsFile }" parsed, but detected empty/non valid JSON object.` );
+	}
+
+	for ( const moduleDir in plugins ) {
+		const pluginVersion = plugins[ moduleDir ]?.version;
+		const pluginSlug = plugins[ moduleDir ]?.slug;
+		if ( pluginVersion && pluginSlug && ( settings.slug === pluginSlug ) ) {
+			return log( pluginVersion );
+		}
+	}
+
+	throw Error( `The "${ settings.slug }" module slug is missing in the file "${ pluginsFile }".` );
+}