diff --git a/requirements.txt b/requirements.txt
index 8da1568b..156893da 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,8 +2,9 @@ fastapi[all]  # Web framework with all extras
 uvicorn  # ASGI server
 celery  # Task queue
 redis  # Message broker for Celery
-sqlalchemy  # Database ORM
-pydantic  # Data validation
+sqlalchemy  # Database ORM
+psycopg[binary]>=3.2,<4.0  # PostgreSQL driver for HA database deployments
+pydantic  # Data validation
 cryptography>=41.0.0  # Encryption for sensitive settings in database
 openai  # GPT integration for metadata extraction
 pypdf>=3.9.0  # PDF processing for text extraction, metadata editing and rotation (upgraded from PyPDF2 to fix CVE-2023-36464)