diff --git a/CHANGELOG.md b/CHANGELOG.md
index 166a0d2..d445d21 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 ### Added
 
+* Automatically find the PHP project type (i.e. Drupal or Sculpin) based on its `composer.json` dependencies.
 * Add `versa build` to build a Sculpin project.
 * Add `--extra-args` to pass extra arguments to the underlying command.
 
diff --git a/versa b/versa
index d358d5f..eb327f1 100755
--- a/versa
+++ b/versa
@@ -43,17 +43,41 @@ $application->addOption(
 );
 
 $application->setCode(function (InputInterface $input): int {
+    $projectType = null;
+
     $extraArgs = $input->getOption('extra-args');
     $workingDir = $input->getOption('working-dir');
 
     $filesystem = new Filesystem();
 
-    $isDockerCompose = $filesystem->exists($workingDir.'/docker-compose.yaml');
+    // Attempt to prepopulate some of the options, such as the project type
+    // based on its dependencies.
+    // TODO: move this logic to a service so it can be tested.
+    if ($filesystem->exists($workingDir.'/composer.json')) {
+        $json = json_decode(
+            json: strval(file_get_contents($workingDir.'/composer.json')),
+            associative: true,
+        );
+
+        $dependencies = array_keys($json['require']);
+
+        if (in_array(needle: 'drupal/core', haystack: $dependencies, strict: true) || in_array(needle: 'drupal/core-recommended', haystack: $dependencies, strict: true)) {
+            $projectType = ProjectType::Drupal->value;
+        } elseif (in_array(needle: 'sculpin/sculpin', haystack: $dependencies, strict: true)) {
+            $projectType = ProjectType::Sculpin->value;
+        }
+    }
+
+    // Even if the project type is found automatically, still override it with
+    // the option value if there is one.
+    $projectType = $input->getOption('type') ?? $projectType;
+
+    $isDockerCompose = $filesystem->exists($workingDir . '/docker-compose.yaml');
 
     // TODO: only allow defined commands - build, install, test, run.
     switch ($input->getArgument('command')) {
         case 'build':
-            switch ($input->getOption('type')) {
+            switch ($projectType) {
                 case ProjectType::Drupal->value:
                     if ($isDockerCompose) {
                         $process = Process::create(
@@ -65,7 +89,7 @@ $application->setCode(function (InputInterface $input): int {
                     }
                     break;
             }
-            switch ($input->getOption('type')) {
+            switch ($projectType) {
                 case ProjectType::Sculpin->value:
                     $process = Process::create(
                         command: ['./vendor/bin/sculpin', 'generate'],
@@ -97,7 +121,7 @@ $application->setCode(function (InputInterface $input): int {
                 $process->setTimeout(null);
                 $process->run();
             } else {
-                switch ($input->getOption('type')) {
+                switch ($projectType) {
                     case ProjectType::Sculpin->value:
                         $process = Process::create(
                             command: ['./vendor/bin/sculpin', 'generate', '--server', '--watch'],