diff --git a/.github/actions/setup-python/action.yml b/.github/actions/setup-python/action.yml
index a6d0565..057b05e 100644
--- a/.github/actions/setup-python/action.yml
+++ b/.github/actions/setup-python/action.yml
@@ -9,10 +9,10 @@ runs:
       with:
         python-version: '3.11'
         cache: 'pip'
-        cache-dependency-path: 'requirements-dev.txt'
+        cache-dependency-path: 'pyproject.toml'
 
     - name: Instalar dependencias
       shell: bash
       run: |
         python -m pip install --upgrade pip
-        pip install -r requirements-dev.txt
+        pip install -e '.[dev]'
diff --git a/Dockerfile b/Dockerfile
index 7ccdfda..dc7c091 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,10 +15,10 @@ RUN apt-get update && apt-get upgrade -y && apt-get install -y --no-install-reco
     gcc \
     && rm -rf /var/lib/apt/lists/*
 
-# Copiar requirements e instalar dependencias
-COPY requirements.txt .
+# Copiar pyproject y usarlo para instalar dependencias
+COPY pyproject.toml .
 RUN pip install --upgrade pip setuptools wheel && \
-    pip install --no-cache-dir -r requirements.txt
+    pip install --no-cache-dir .
 
 # Stage 2: Runtime
 FROM python:3.11-slim-bookworm
diff --git a/docs/development.md b/docs/development.md
index d21e0ab..d1fafe6 100644
--- a/docs/development.md
+++ b/docs/development.md
@@ -17,10 +17,8 @@ python -m venv .venv
 # Unix
 source .venv/bin/activate
 # Instalar dependencias
-
-pip install -r requirements.txt
-# o
-pip install -r requirements-dev.txt
+python -m pip install --upgrade pip
+pip install -e '.[dev]'
 
 # Levantar Redis para desarrollo
 docker run -d -p 6379:6379 redis:7-alpine
diff --git a/pyproject.toml b/pyproject.toml
index 84de913..bef891c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,3 +1,46 @@
+[build-system]
+requires = ["setuptools>=61.0", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "modelrouter"
+version = "0.1.0"
+description = "API asíncrona para orquestación multi-proveedor de LLM con streaming y fallback automático."
+readme = "README.md"
+license = { text = "Apache-2.0" }
+authors = [
+    { name = "HC-ONLINE" }
+]
+requires-python = ">=3.11"
+dependencies = [
+    "fastapi==0.115.6",
+    "uvicorn[standard]==0.34.0",
+    "pydantic==2.10.6",
+    "pydantic-settings==2.7.1",
+    "httpx==0.26.0",
+    "redis==5.0.1",
+    "hiredis==2.3.2",
+    "prometheus-client==0.19.0",
+    "python-json-logger==2.0.7",
+    "python-dotenv==1.0.0",
+    "python-multipart==0.0.22",
+]
+
+[project.optional-dependencies]
+dev = [
+    "black==24.10.0",
+    "flake8==7.1.1",
+    "pre-commit==4.0.1",
+    "mypy==1.13.0",
+    "types-redis==4.6.0.20240425",
+    "types-requests==2.31.0.20240125",
+    "typing-extensions==4.12.2",
+    "pytest==8.3.4",
+    "pytest-asyncio==0.24.0",
+    "pytest-cov==6.0.0",
+    "pytest-mock==3.14.0",
+]
+
 [tool.black]
 line-length = 88
 target-version = ['py311']
diff --git a/requirements-dev.txt b/requirements-dev.txt
deleted file mode 100644
index 2d44ca3..0000000
--- a/requirements-dev.txt
+++ /dev/null
@@ -1,25 +0,0 @@
-# Dependencias de desarrollo y CI
--r requirements.txt
-
-# Linting y formato
-black==24.10.0
-flake8==7.1.1
-pre-commit==4.0.1
-setuptools>=75.5.0
-wheel>=0.46.2
-
-# Type checking
-mypy==1.13.0
-types-redis==4.6.0.20240425
-types-requests==2.31.0.20240125
-typing-extensions==4.12.2
-
-# Instalar stubs inline para las bibliotecas que no los tienen
-fastapi  # Tiene stubs propios
-pydantic  # Tiene stubs propios
-
-# Testing
-pytest==8.3.4
-pytest-asyncio==0.24.0
-pytest-cov==6.0.0
-pytest-mock==3.14.0
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index 46817ab..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1,20 +0,0 @@
-# Core
-fastapi==0.115.6
-uvicorn[standard]==0.34.0
-pydantic==2.10.6
-pydantic-settings==2.7.1
-
-# HTTP Client
-httpx==0.26.0
-
-# Redis
-redis==5.0.1
-hiredis==2.3.2
-
-# Observabilidad
-prometheus-client==0.19.0
-python-json-logger==2.0.7
-
-# Utilidades
-python-dotenv==1.0.0
-python-multipart==0.0.22