diff --git a/requirements.txt b/requirements.txt
index 9cb0d01..e5e02e9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,28 @@
-flask>=3.0
-werkzeug>=3.0
-gunicorn>=22.0
+# CRM System v1.0 - Production Dependencies
+# Pinned per 02-architecture.md Section 13.6
+
+# Web framework
+fastapi>=0.111.0,<0.116
+uvicorn[standard]>=0.29.0
+
+# Database / ORM
+sqlalchemy==2.0.35
+alembic>=1.13
+aiosqlite>=0.19
+asyncpg>=0.29
+
+# Validation / Settings
+pydantic>=2.5
+pydantic-settings>=2.1
+
+# Auth
+python-jose[cryptography]==3.3.0
+passlib[bcrypt]==1.7.4
+bcrypt==4.0.1
+python-multipart>=0.0.7
+
+# File I/O (for static files in phase 4c)
+aiofiles>=23.2
+
+# Templates (optional, for error pages)
+jinja2>=3.1