diff --git a/Pipfile b/Pipfile
index 173d643..4661008 100644
--- a/Pipfile
+++ b/Pipfile
@@ -4,8 +4,7 @@ verify_ssl = true
 name = "pypi"
 
 [packages]
-aiohttp = "*"
-attrs = "==21.2.0"
+aiohttp = "<4.0,>=3.8"
 
 [dev-packages]
 ipdb = "*"
diff --git a/ideenergy/cli.py b/ideenergy/cli.py
index fbfd2ca..2386e5c 100644
--- a/ideenergy/cli.py
+++ b/ideenergy/cli.py
@@ -92,14 +92,14 @@ async def _main():
     )
 
     try:
-        data = await _main()
+        if data := await _main():
+            print(pprint.pformat(data))
 
     except RequestFailedError as e:
         print(f"Request failed: {e}", file=sys.stderr)
         await session.close()
-        return
+        sys.ext(1)
 
-    print(pprint.pformat(data))
     await session.close()
 
 
diff --git a/setup.cfg b/setup.cfg
index aabd334..ead40c6 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -2,7 +2,7 @@
 
 [metadata]
 name = ideenergy
-version = 1.0.0-rc1
+version = 1.0.0-rc2
 author = Luis López
 author_email = luis@cuarentaydos.com
 description = Interface to i-de.es energy data
@@ -22,11 +22,10 @@ package_dir =
 packages = find:
 python_requires = >=3.9
 install_requires =
-   aiohttp
-   attrs == 21.2.0
+   aiohttp>=3.8.0, <4
 
 [options.extras_require]
-mqtt = paho-mqtt >= 1.6.1
+mqtt = paho-mqtt >= 1.6.1, <2
 
 [options.packages.find]
 where =