diff --git a/apps/python-sdk/firecrawl/__init__.py b/apps/python-sdk/firecrawl/__init__.py
index 1b52e0c1..273fc1a6 100644
--- a/apps/python-sdk/firecrawl/__init__.py
+++ b/apps/python-sdk/firecrawl/__init__.py
@@ -13,7 +13,7 @@ import os
 
 from .firecrawl import FirecrawlApp # noqa
 
-__version__ = "1.13.3"
+__version__ = "1.13.5"
 
 # Define the logger for the Firecrawl project
 logger: logging.Logger = logging.getLogger("firecrawl")
diff --git a/apps/python-sdk/firecrawl/firecrawl.py b/apps/python-sdk/firecrawl/firecrawl.py
index 6b04d09b..d79b174c 100644
--- a/apps/python-sdk/firecrawl/firecrawl.py
+++ b/apps/python-sdk/firecrawl/firecrawl.py
@@ -669,17 +669,23 @@ class FirecrawlApp:
                 schema = schema.model_json_schema()
             # Otherwise assume it's already a JSON schema dict
 
-        jsonData = {'urls': urls, **params}
         request_data = {
-            **jsonData,
+            'urls': urls,
             'allowExternalLinks': params.get('allow_external_links', params.get('allowExternalLinks', False)),
-            'enableWebSearch': params.get('enable_web_search', params.get('enableWebSearch', False)),
+            'enableWebSearch': params.get('enable_web_search', params.get('enableWebSearch', False)), 
             'showSources': params.get('show_sources', params.get('showSources', False)),
-            'systemPrompt': params.get('system_prompt', params.get('systemPrompt', None)),
             'schema': schema,
             'origin': 'api-sdk'
         }
 
+        # Only add prompt and systemPrompt if they exist
+        if params.get('prompt'):
+            request_data['prompt'] = params['prompt']
+        if params.get('system_prompt'):
+            request_data['systemPrompt'] = params['system_prompt']
+        elif params.get('systemPrompt'):  # Check legacy field name
+            request_data['systemPrompt'] = params['systemPrompt']
+
         try:
             # Send the initial extract request
             response = self._post_request(