diff --git a/packages/rspack/lib/dependencies.js b/packages/rspack/lib/dependencies.js
index f458457a5c..feb67ef3a3 100644
--- a/packages/rspack/lib/dependencies.js
+++ b/packages/rspack/lib/dependencies.js
@@ -81,6 +81,9 @@ async function ensureDependenciesInstalled(dependencies, globalStateKey, package
       logInfo(`  • ${dep}`);
     });
 
+    // Check if this is a Yarn project
+    const isYarnProj = process.env.YARN_ENABLED === 'true';
+
     // Install dev dependencies
     const devDepsToInstall = allDepsToInstall.filter(dep => dep.dev === true || dep.dev == null);
     if (devDepsToInstall.length > 0) {
@@ -88,6 +91,7 @@ async function ensureDependenciesInstalled(dependencies, globalStateKey, package
       success = await installNpmDependency(devDepsStrings, {
         cwd: appDir,
         dev: true,
+        yarn: isYarnProj,
       });
     }
 
@@ -95,22 +99,30 @@ async function ensureDependenciesInstalled(dependencies, globalStateKey, package
     const depsToInstall = allDepsToInstall.filter(dep => dep.dev === false);
     if (depsToInstall.length > 0) {
       const depsStrings = depsToInstall.map(dep => `${dep.name}@${dep.version}`);
-      const depsSuccess = await installNpmDependency(depsStrings, {
+
+      let depsSuccess;
+      depsSuccess = await installNpmDependency(depsStrings, {
         cwd: appDir,
         dev: false,
+        yarn: isYarnProj,
       });
 
       success = success && depsSuccess;
     }
 
     if (!success) {
+      const isYarnProj = process.env.YARN_ENABLED === 'true';
+      const installCommand = isYarnProj 
+        ? `yarn add --dev ${joinWithAnd(dependencyStrings)}`
+        : `meteor npm install -D ${joinWithAnd(dependencyStrings)}`;
+
       logError(`\n┌─────────────────────────────────────────────────`);
       logError(`│ ❌ ${packageName} Installation Failed`);
       logError(`└─────────────────────────────────────────────────`);
-      logError(`Run: meteor npm install -D ${joinWithAnd(dependencyStrings)}`);
+      logError(`Run: ${installCommand}`);
 
       throw new Error(
-        `Failed to install ${packageName} dependencies. Please install them manually with: meteor npm install -D ${joinWithAnd(dependencyStrings)}`
+        `Failed to install ${packageName} dependencies. Please install them manually with: ${installCommand}`
       );
     }
 
diff --git a/packages/rspack/rspack_plugin.js b/packages/rspack/rspack_plugin.js
index 737e590796..c76f6dbd2b 100644
--- a/packages/rspack/rspack_plugin.js
+++ b/packages/rspack/rspack_plugin.js
@@ -79,17 +79,29 @@ const {
 const {
   getNpxCommand,
   getNpmCommand,
+  getYarnCommand,
+  isYarnProject,
 } = require('meteor/tools-core/lib/npm');
 
 if (isMeteorAppRun() || isMeteorAppBuild() || isMeteorAppTest()) {
   // Get entry points from Meteor configuration
   setGlobalState(GLOBAL_STATE_KEYS.INITIAL_ENTRYPONTS, getMeteorAppEntrypoints());
 
+  let isYarnProj = process.env.YARN_ENABLED === 'true';
+  console.log("--> (rspack_plugin.js-Line: 91)\n process.env.YARN_ENABLED: ", process.env.YARN_ENABLED);
   // Main entry point - using top-level await
   try {
+    // Check if the project is a Yarn project and store the result in environment variable if not already set
+    if (process.env.YARN_ENABLED === undefined) {
+      isYarnProj = isYarnProject();
+      process.env.YARN_ENABLED = isYarnProj ? 'true' : 'false';
+    }
     if (isMeteorAppDebug() || isMeteorAppConfigModernVerbose()) {
       logInfo(`[i] Meteor Npx prefix: ${getNpxCommand([])?.prefix}`);
       logInfo(`[i] Meteor Npm prefix: ${getNpmCommand([])?.prefix}`);
+      if (isYarnProj) {
+        logInfo(`[i] Meteor Yarn prefix: ${getYarnCommand([])?.prefix}`);
+      }
     }
 
     // Clean build context files only if they haven't been cleaned yet
diff --git a/packages/tools-core/lib/npm.js b/packages/tools-core/lib/npm.js
index a07bad0b1a..315b52fb06 100644
--- a/packages/tools-core/lib/npm.js
+++ b/packages/tools-core/lib/npm.js
@@ -136,6 +136,37 @@ function buildNpmInstallArgs(dependencies, options = {}) {
   return args;
 }
 
+/**
+ * Builds yarn install arguments based on options and dependencies
+ * 
+ * @param {string|string[]} dependencies - The npm dependency or dependencies to install
+ * @param {Object} [options] - Options for the installation
+ * @param {boolean} [options.dev=false] - If true, install as a dev dependency
+ * @param {boolean} [options.exact=false] - If true, install with exact version
+ * @returns {string[]} Array of arguments for the yarn add command
+ */
+function buildYarnInstallArgs(dependencies, options = {}) {
+  const args = ['add'];
+
+  // Add flags based on options
+  if (options.dev) {
+    args.push('--dev');
+  }
+
+  if (options.exact) {
+    args.push('--exact');
+  }
+
+  // Add dependencies to the command
+  if (Array.isArray(dependencies)) {
+    args.push(...dependencies);
+  } else {
+    args.push(dependencies);
+  }
+
+  return args;
+}
+
 /**
  * Executes a command and returns a promise that resolves to true if successful
  * 
@@ -161,17 +192,26 @@ function executeCommand(command, args, options) {
 
 /**
  * Installs a npm dependency using direct npm binary if available, otherwise falls back to `meteor npm install`.
+ * If yarn option is true, uses yarn instead.
  * 
  * @param {string|string[]} dependencies - The npm dependency or dependencies to install
  * @param {Object} [options] - Options for the installation
  * @param {string} [options.cwd] - Current working directory (defaults to process.cwd())
  * @param {boolean} [options.dev=false] - If true, install as a dev dependency
  * @param {boolean} [options.exact=false] - If true, install with exact version
+ * @param {boolean} [options.yarn=false] - If true, use yarn instead of npm
  * @returns {Promise<boolean>} A promise that resolves to true if installation succeeded, false otherwise
  */
 export function installNpmDependency(dependencies, options = {}) {
   const cwd = options.cwd || process.cwd();
 
+  // If yarn option is true, use yarn
+  if (options.yarn) {
+    const { command, args: baseArgs } = getYarnCommand([]);
+    const args = buildYarnInstallArgs(dependencies, options);
+    return executeCommand(command, [...baseArgs, ...args], { cwd });
+  }
+
   // Try to get the npm binary path
   const npmBinaryPath = getNodeBinaryPath('npm');
 
@@ -319,3 +359,64 @@ export function getNpxCommand(args) {
     prefix: `meteor npx`,
   };
 }
+
+/**
+ * Checks if the current project is a Yarn project.
+ * Looks for yarn.lock file in the current working directory and checks packageManager in package.json.
+ * 
+ * @param {Object} [options] - Options for the check
+ * @param {string} [options.cwd] - Current working directory (defaults to process.cwd())
+ * @returns {boolean} True if it's a Yarn project, false otherwise
+ */
+export function isYarnProject(options = {}) {
+  const cwd = options.cwd || process.cwd();
+
+  // Check if yarn.lock exists
+  const yarnLockPath = path.join(cwd, 'yarn.lock');
+  if (fs.existsSync(yarnLockPath)) {
+    return true;
+  }
+
+  // Check packageManager field in package.json
+  try {
+    const packageJsonPath = path.join(cwd, 'package.json');
+    if (fs.existsSync(packageJsonPath)) {
+      const packageJson = JSON.parse(fs.readFileSync(packageJsonPath, 'utf8'));
+
+      // Check if packageManager contains "yarn"
+      if (packageJson.packageManager && packageJson.packageManager.includes('yarn')) {
+        return true;
+      }
+    }
+  } catch (error) {
+    // If there's an error reading or parsing package.json, continue
+  }
+
+  return false;
+}
+
+/**
+ * Gets the yarn command and arguments
+ * @param {string[]} args - The arguments to pass to yarn
+ * @returns {Object} An object with command, args, and base properties
+ */
+export function getYarnCommand(args) {
+  // Try to get the yarn binary path
+  const yarnBinaryPath = getNodeBinaryPath('yarn');
+
+  // If we have a direct path to yarn, use it
+  if (yarnBinaryPath && fs.existsSync(yarnBinaryPath)) {
+    return {
+      command: yarnBinaryPath,
+      args,
+      prefix: `${yarnBinaryPath}`,
+    };
+  }
+
+  // Fall back to using 'yarn' directly
+  return {
+    command: 'yarn',
+    args,
+    prefix: `yarn`,
+  };
+}