diff --git a/code/addons/a11y/src/postinstall.ts b/code/addons/a11y/src/postinstall.ts
index cf57bddb9853..25f2de9d6e8c 100644
--- a/code/addons/a11y/src/postinstall.ts
+++ b/code/addons/a11y/src/postinstall.ts
@@ -1,32 +1,29 @@
-// eslint-disable-next-line depend/ban-dependencies
-import { execa } from 'execa';
+import { JsPackageManagerFactory } from 'storybook/internal/common';
 
 import type { PostinstallOptions } from '../../../lib/cli-storybook/src/add';
 
-const $ = execa({
-  preferLocal: true,
-  stdio: 'inherit',
-  // we stream the stderr to the console
-  reject: false,
-});
-
 export default async function postinstall(options: PostinstallOptions) {
-  const command = ['storybook', 'automigrate', 'addon-a11y-addon-test'];
+  const args = ['automigrate', 'addon-a11y-addon-test'];
 
-  command.push('--loglevel', 'silent');
-  command.push('--skip-doctor');
+  args.push('--loglevel', 'silent');
+  args.push('--skip-doctor');
 
   if (options.yes) {
-    command.push('--yes');
+    args.push('--yes');
   }
 
   if (options.packageManager) {
-    command.push('--package-manager', options.packageManager);
+    args.push('--package-manager', options.packageManager);
   }
 
   if (options.configDir) {
-    command.push('--config-dir', `"${options.configDir}"`);
+    args.push('--config-dir', options.configDir);
   }
 
-  await $`${command.join(' ')}`;
+  const jsPackageManager = JsPackageManagerFactory.getPackageManager({
+    force: options.packageManager,
+    configDir: options.configDir,
+  });
+
+  await jsPackageManager.runPackageCommand('storybook', args);
 }
diff --git a/code/lib/cli-storybook/src/automigrate/index.ts b/code/lib/cli-storybook/src/automigrate/index.ts
index 76216837d2a1..d4198b58b7bd 100644
--- a/code/lib/cli-storybook/src/automigrate/index.ts
+++ b/code/lib/cli-storybook/src/automigrate/index.ts
@@ -324,17 +324,19 @@ export async function runFixes({
             break;
           }
         } else if (promptType === 'auto') {
-          const shouldRun = await prompt.confirm(
-            {
-              message: `Do you want to run the '${picocolors.cyan(f.id)}' migration on your project?`,
-              initialValue: f.defaultSelected ?? true,
-            },
-            {
-              onCancel: () => {
-                throw new Error();
-              },
-            }
-          );
+          const shouldRun = yes
+            ? true
+            : await prompt.confirm(
+                {
+                  message: `Do you want to run the '${picocolors.cyan(f.id)}' migration on your project?`,
+                  initialValue: f.defaultSelected ?? true,
+                },
+                {
+                  onCancel: () => {
+                    throw new Error();
+                  },
+                }
+              );
           runAnswer = { fix: shouldRun };
         } else if (promptType === 'notification') {
           const shouldContinue = await prompt.confirm(