diff --git a/dev_gpt/constants.py b/dev_gpt/constants.py
index 7541d8e..afd369f 100644
--- a/dev_gpt/constants.py
+++ b/dev_gpt/constants.py
@@ -50,7 +50,8 @@ DEMO_TOKEN = '45372338e04f5a41af949024db929d46'
 BLACKLISTED_PACKAGES = [
     'moderngl', 'pyopengl', 'pyglet', 'pythreejs', 'panda3d',  # because they need a screen,
     'tika',  # because it needs java
-    'clearbit'  # because of installation issues on latest version
+    'clearbit',  # because of installation issues on latest version
+    'pyttsx3',  # after engine.save_to_file(summarized_text, "summarized_audio.wav"); engine.runAndWait() "summarized_audio.wav" does not exist
 ]
 UNNECESSARY_PACKAGES = [
     'jinja2', 'werkzeug', 'flask', 'flask_restful', 'http.server', 'flask_json', 'flask_cors', 'fastapi', 'uvicorn', 'starlette'  # because the wrappers are used instead