diff --git a/src/NewCommand.php b/src/NewCommand.php
index 7af1dca..e0744ec 100644
--- a/src/NewCommand.php
+++ b/src/NewCommand.php
@@ -85,6 +85,8 @@ protected function interact(InputInterface $input, OutputInterface $output)
   | |___| (_| | | | (_| |\ V /  __/ |
   |______\__,_|_|  \__,_| \_/ \___|_|</>'.PHP_EOL.PHP_EOL);
 
+        $this->ensureExtensionsAreAvailable($input, $output);
+
         if (! $input->getArgument('name')) {
             $input->setArgument('name', text(
                 label: 'What is the name of your project?',
@@ -147,6 +149,38 @@ protected function interact(InputInterface $input, OutputInterface $output)
         // }
     }
 
+    /**
+     * Ensure that the required PHP extensions are installed.
+     *
+     * @param  \Symfony\Component\Console\Input\InputInterface  $input
+     * @param  \Symfony\Component\Console\Output\OutputInterface  $output
+     * @return void
+     *
+     * @throws \RuntimeException
+     */
+    protected function ensureExtensionsAreAvailable(InputInterface $input, OutputInterface $output): void
+    {
+        $availableExtensions = get_loaded_extensions();
+
+        $missingExtensions = collect([
+            'ctype',
+            'filter',
+            'hash',
+            'mbstring',
+            'openssl',
+            'session',
+            'tokenizer',
+        ])->reject(fn ($extension) => in_array($extension, $availableExtensions));
+
+        if ($missingExtensions->isEmpty()) {
+            return;
+        }
+
+        throw new \RuntimeException(
+            sprintf('The following PHP extensions are required but are not installed: %s', $missingExtensions->join(', ', ', and '))
+        );
+    }
+
     /**
      * Execute the command.
      *