diff --git a/api/metrics.py b/api/metrics.py
index 8edb5ae..b71050b 100644
--- a/api/metrics.py
+++ b/api/metrics.py
@@ -11,7 +11,6 @@
 )
 from fastapi import Response
 
-
 # ========== Contadores ==========
 
 # Requests totales por endpoint y método
diff --git a/pyproject.toml b/pyproject.toml
index c4a4b70..3826ff8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,7 +28,7 @@ dependencies = [
 
 [project.optional-dependencies]
 dev = [
-    "black==24.10.0",
+    "black==26.3.1",
     "flake8==7.1.1",
     "pre-commit==4.0.1",
     "mypy==1.13.0",
diff --git a/scripts/client_fetch.py b/scripts/client_fetch.py
index 531065c..19c5425 100644
--- a/scripts/client_fetch.py
+++ b/scripts/client_fetch.py
@@ -7,6 +7,7 @@
 Uso:
   python scripts/client_fetch.py --message "Hola" --max-tokens 150
 """
+
 import argparse
 import json
 import os
@@ -29,9 +30,13 @@ def load_api_key() -> str:
 
 def main() -> None:
     parser = argparse.ArgumentParser(description="Prueba cliente fetch contra /chat")
-    parser.add_argument("--message", "-m", default="Explica qué es Redis", help="Mensaje del usuario")
+    parser.add_argument(
+        "--message", "-m", default="Explica qué es Redis", help="Mensaje del usuario"
+    )
     parser.add_argument("--max-tokens", "-n", type=int, default=150, help="Max tokens")
-    parser.add_argument("--url", "-u", default="http://localhost:8000/chat", help="URL del endpoint")
+    parser.add_argument(
+        "--url", "-u", default="http://localhost:8000/chat", help="URL del endpoint"
+    )
     args = parser.parse_args()
 
     api_key = load_api_key()
diff --git a/scripts/client_stream.py b/scripts/client_stream.py
index ce7369d..bbc2293 100644
--- a/scripts/client_stream.py
+++ b/scripts/client_stream.py
@@ -8,6 +8,7 @@
 Uso:
     python scripts/client_stream.py --message "Hola" --max-tokens 150
 """
+
 import argparse
 import asyncio
 import json
@@ -42,7 +43,9 @@ async def stream_request(url: str, api_key: str, message: str, max_tokens: int)
 
     async with httpx.AsyncClient() as client:
         try:
-            async with client.stream("POST", url, headers=headers, json=payload, timeout=60.0) as resp:
+            async with client.stream(
+                "POST", url, headers=headers, json=payload, timeout=60.0
+            ) as resp:
                 print(f"HTTP {resp.status_code}")
 
                 async for line in resp.aiter_lines():
@@ -67,9 +70,13 @@ async def stream_request(url: str, api_key: str, message: str, max_tokens: int)
 
 def main() -> None:
     parser = argparse.ArgumentParser(description="Cliente streaming contra /stream")
-    parser.add_argument("--message", "-m", default="Explica qué es Redis", help="Mensaje del usuario")
+    parser.add_argument(
+        "--message", "-m", default="Explica qué es Redis", help="Mensaje del usuario"
+    )
     parser.add_argument("--max-tokens", "-n", type=int, default=200, help="Max tokens")
-    parser.add_argument("--url", "-u", default="http://localhost:8000/stream", help="URL del endpoint")
+    parser.add_argument(
+        "--url", "-u", default="http://localhost:8000/stream", help="URL del endpoint"
+    )
     args = parser.parse_args()
 
     api_key = load_api_key()
diff --git a/scripts/test.py b/scripts/test.py
index 982f88e..336dda9 100644
--- a/scripts/test.py
+++ b/scripts/test.py
@@ -1,6 +1,7 @@
 """
 Script de utilidad para ejecutar tests localmente con configuración adecuada.
 """
+
 import subprocess
 import sys
 
@@ -14,7 +15,7 @@ def run_tests():
         "-v",
         "--cov=api",
         "--cov-report=html",
-        "--cov-report=term-missing"
+        "--cov-report=term-missing",
     ]
 
     result = subprocess.run(cmd)