diff --git a/mailpoet/lib/Automation/Engine/Builder/UpdateWorkflowController.php b/mailpoet/lib/Automation/Engine/Builder/UpdateWorkflowController.php
index 0ceced94d3..b34d79b63a 100644
--- a/mailpoet/lib/Automation/Engine/Builder/UpdateWorkflowController.php
+++ b/mailpoet/lib/Automation/Engine/Builder/UpdateWorkflowController.php
@@ -5,6 +5,7 @@ namespace MailPoet\Automation\Engine\Builder;
 use MailPoet\Automation\Engine\Exceptions;
 use MailPoet\Automation\Engine\Exceptions\UnexpectedValueException;
 use MailPoet\Automation\Engine\Storage\WorkflowStorage;
+use MailPoet\Automation\Engine\Workflows\Step;
 use MailPoet\Automation\Engine\Workflows\Workflow;
 
 class UpdateWorkflowController {
@@ -40,6 +41,22 @@ class UpdateWorkflowController {
       $changed = true;
     }
 
+    if (array_key_exists('steps', $data)) {
+      $this->validateWorkflowSteps($workflow, $data['steps']);
+      $steps = [];
+      foreach ($data['steps'] as $step) {
+        $steps[(string)$step['id']] = new Step(
+          $step['id'],
+          $step['type'],
+          $step['key'],
+          $step['next_step_id'] ?? null,
+          $step['args'] ?? null
+        );
+      }
+      $workflow->setSteps($steps);
+      $changed = true;
+    }
+
     if ($changed) {
       $this->storage->updateWorkflow($workflow);
     }
@@ -56,4 +73,24 @@ class UpdateWorkflowController {
       throw UnexpectedValueException::create()->withMessage(__(sprintf('Invalid status: %s', $status), 'mailpoet'));
     }
   }
+
+  private function validateWorkflowSteps(Workflow $workflow, array $steps): void {
+    $existingSteps = $workflow->getSteps();
+    if (count($steps) !== count($existingSteps)) {
+      throw Exceptions::workflowStructureModificationNotSupported();
+    }
+
+    foreach ($steps as $id => $data) {
+      $existingStep = $existingSteps[$id] ?? null;
+      if (
+        !$existingStep
+        || $data['id'] !== $existingStep->getId()
+        || $data['type'] !== $existingStep->getType()
+        || $data['key'] !== $existingStep->getKey()
+        || $data['next_step_id'] !== $existingStep->getNextStepId()
+      ) {
+        throw Exceptions::workflowStructureModificationNotSupported();
+      }
+    }
+  }
 }
diff --git a/mailpoet/lib/Automation/Engine/Endpoints/Workflows/WorkflowsPutEndpoint.php b/mailpoet/lib/Automation/Engine/Endpoints/Workflows/WorkflowsPutEndpoint.php
index 1998c665a6..4847bbb5df 100644
--- a/mailpoet/lib/Automation/Engine/Endpoints/Workflows/WorkflowsPutEndpoint.php
+++ b/mailpoet/lib/Automation/Engine/Endpoints/Workflows/WorkflowsPutEndpoint.php
@@ -29,10 +29,19 @@ class WorkflowsPutEndpoint extends Endpoint {
   }
 
   public static function getRequestSchema(): array {
+    $step = Builder::object([
+      'id' => Builder::string()->required(),
+      'type' => Builder::string()->required(),
+      'key' => Builder::string()->required(),
+      'args' => Builder::object(),
+      'next_step_id' => Builder::string()->nullable(),
+    ]);
+
     return [
       'id' => Builder::integer()->required(),
       'name' => Builder::string()->minLength(1),
       'status' => Builder::string(),
+      'steps' => Builder::object()->additionalProperties($step),
     ];
   }
 
diff --git a/mailpoet/lib/Automation/Engine/Exceptions.php b/mailpoet/lib/Automation/Engine/Exceptions.php
index e904757cce..fb088f05a0 100644
--- a/mailpoet/lib/Automation/Engine/Exceptions.php
+++ b/mailpoet/lib/Automation/Engine/Exceptions.php
@@ -21,6 +21,7 @@ class Exceptions {
   private const SUBJECT_NOT_FOUND = 'mailpoet_automation_subject_not_found';
   private const SUBJECT_LOAD_FAILED = 'mailpoet_automation_workflow_subject_load_failed';
   private const MULTIPLE_SUBJECTS_FOUND = 'mailpoet_automation_multiple_subjects_found';
+  private const WORKFLOW_STRUCTURE_MODIFICATION_NOT_SUPPORTED = 'mailpoet_automation_workflow_structure_modification_not_supported';
 
   public function __construct() {
     throw new InvalidStateException(
@@ -112,4 +113,10 @@ class Exceptions {
       ->withErrorCode(self::MULTIPLE_SUBJECTS_FOUND)
       ->withMessage(__(sprintf("Multiple subjects with key '%s' found, only one expected.", $key), 'mailpoet'));
   }
+
+  public static function workflowStructureModificationNotSupported(): UnexpectedValueException {
+    return UnexpectedValueException::create()
+      ->withErrorCode(self::WORKFLOW_STRUCTURE_MODIFICATION_NOT_SUPPORTED)
+      ->withMessage(__("Workflow structure modification not supported.", 'mailpoet'));
+  }
 }
diff --git a/mailpoet/lib/Automation/Engine/Workflows/Workflow.php b/mailpoet/lib/Automation/Engine/Workflows/Workflow.php
index e839642f39..5dfe467311 100644
--- a/mailpoet/lib/Automation/Engine/Workflows/Workflow.php
+++ b/mailpoet/lib/Automation/Engine/Workflows/Workflow.php
@@ -82,6 +82,11 @@ class Workflow {
     return $this->steps;
   }
 
+  /** @param array<string, Step> $steps */
+  public function setSteps(array $steps): void {
+    $this->steps = $steps;
+  }
+
   public function getStep(string $id): ?Step {
     return $this->steps[$id] ?? null;
   }