diff --git a/Makefile b/Makefile
index 68ff600..cac499b 100644
--- a/Makefile
+++ b/Makefile
@@ -19,3 +19,4 @@ test:
 
 update:
 	pip-compile -U --no-header --no-annotate --strip-extras --resolver backtracking
+	pip-sync
diff --git a/chaotic/__init__.py b/chaotic/__init__.py
index ef7ee56..62f867d 100644
--- a/chaotic/__init__.py
+++ b/chaotic/__init__.py
@@ -1,3 +1,4 @@
+from chaotic.cloud import Chaotic
 from chaotic.cloud.cloudscale_ch import CloudscaleChChaotic
 from chaotic.cloud.cloudstack import CloudStackChaotic
 from chaotic.cloud.digitalocean import DigitaloceanChaotic
@@ -22,7 +23,7 @@ class ChaoticFactory:
         "vultr": VultrChaotic,
     }
 
-    def get_instance(self, name: str) -> object:
+    def get_instance(self, name: str) -> Chaotic:
         log.info(f"Instantiate {name}")
         try:
             return self.CLOUD_CLASSES[name]()
diff --git a/chaotic/app.py b/chaotic/app.py
index 1a07a15..18c73ff 100644
--- a/chaotic/app.py
+++ b/chaotic/app.py
@@ -1,17 +1,19 @@
+import json
 import os
 import sys
-from requests.models import Response
-import yaml
-import json
 import time
-import schedule
 from argparse import ArgumentParser
+
 import requests
+import schedule
+import yaml
+from requests.models import Response
 
+from chaotic import ChaoticFactory
+from chaotic.cloud import Chaotic
 from chaotic.log import log
 from chaotic.version import __version__
 
-from chaotic import ChaoticFactory
 
 def app() -> None:
     print("")
diff --git a/chaotic/cloud/cloudscale_ch.py b/chaotic/cloud/cloudscale_ch.py
index df526c9..174860f 100644
--- a/chaotic/cloud/cloudscale_ch.py
+++ b/chaotic/cloud/cloudscale_ch.py
@@ -1,12 +1,13 @@
 import os
 import random
 import time
+
 from cloudscale import Cloudscale, CloudscaleApiException
 
 from chaotic.cloud import Chaotic
 from chaotic.log import log
 
-CLOUDSCALE_API_TOKEN: str = os.getenv('CLOUDSCALE_API_TOKEN')
+CLOUDSCALE_API_TOKEN: str = os.getenv('CLOUDSCALE_API_TOKEN', "")
 
 class CloudscaleChChaotic(Chaotic):
 
diff --git a/chaotic/cloud/cloudstack.py b/chaotic/cloud/cloudstack.py
index ebdc931..9d7cc8d 100644
--- a/chaotic/cloud/cloudstack.py
+++ b/chaotic/cloud/cloudstack.py
@@ -1,14 +1,15 @@
 import os
 import random
 import time
+
 from cs import CloudStack
 
 from chaotic.cloud import Chaotic
 from chaotic.log import log
 
-CLOUDSTACK_API_ENDPOINT: str = os.getenv('CLOUDSTACK_API_ENDPOINT')
-CLOUDSTACK_API_KEY: str = os.getenv('CLOUDSTACK_API_KEY')
-CLOUDSTACK_API_SECRET: str = os.getenv('CLOUDSTACK_API_SECRET')
+CLOUDSTACK_API_ENDPOINT: str = os.getenv('CLOUDSTACK_API_ENDPOINT', "")
+CLOUDSTACK_API_KEY: str = os.getenv('CLOUDSTACK_API_KEY', "")
+CLOUDSTACK_API_SECRET: str = os.getenv('CLOUDSTACK_API_SECRET', "")
 
 
 class CloudStackChaotic(Chaotic):
@@ -21,7 +22,10 @@ def __init__(self) -> None:
         )
 
     def action(self) -> None:
-        tag = self.configs.get('tag')
+        tag = self.configs.get("tag")
+        if not tag:
+            return
+
         log.info(f"Querying with tag: {tag['key']}={tag['value']}")
 
         instances = self.cs.listVirtualMachines(
diff --git a/chaotic/cloud/digitalocean.py b/chaotic/cloud/digitalocean.py
index 5a7156c..e6f233a 100644
--- a/chaotic/cloud/digitalocean.py
+++ b/chaotic/cloud/digitalocean.py
@@ -1,6 +1,6 @@
-import os
 import random
 import time
+
 import digitalocean
 
 from chaotic.cloud import Chaotic
diff --git a/chaotic/cloud/exoscale.py b/chaotic/cloud/exoscale.py
index 8c68775..cd4cc4d 100644
--- a/chaotic/cloud/exoscale.py
+++ b/chaotic/cloud/exoscale.py
@@ -1,14 +1,13 @@
 import os
-import random
-import time
+
 from cs import CloudStack
 
 from chaotic.cloud.cloudstack import CloudStackChaotic
 from chaotic.log import log
 
 EXOSCALE_API_ENDPOINT: str = "https://api.exoscale.com/compute"
-EXOSCALE_API_KEY: str = os.getenv('EXOSCALE_API_KEY')
-EXOSCALE_API_SECRET: str = os.getenv('EXOSCALE_API_SECRET')
+EXOSCALE_API_KEY: str = os.getenv('EXOSCALE_API_KEY', "")
+EXOSCALE_API_SECRET: str = os.getenv('EXOSCALE_API_SECRET', "")
 
 
 class ExoscaleChaotic(CloudStackChaotic):
diff --git a/chaotic/cloud/hcloud.py b/chaotic/cloud/hcloud.py
index 86dc76b..7b94595 100644
--- a/chaotic/cloud/hcloud.py
+++ b/chaotic/cloud/hcloud.py
@@ -1,12 +1,13 @@
 import os
 import random
 import time
-from hcloud import Client, APIException
+
+from hcloud import Client
 
 from chaotic.cloud import Chaotic
 from chaotic.log import log
 
-HCLOUD_API_TOKEN: str = os.getenv('HCLOUD_API_TOKEN')
+HCLOUD_API_TOKEN: str = os.getenv("HCLOUD_API_TOKEN", "")
 
 class HcloudChaotic(Chaotic):
 
diff --git a/chaotic/cloud/proxmox_kvm.py b/chaotic/cloud/proxmox_kvm.py
index bd41a33..985f12a 100644
--- a/chaotic/cloud/proxmox_kvm.py
+++ b/chaotic/cloud/proxmox_kvm.py
@@ -1,15 +1,16 @@
 import os
 import random
 import time
+
 from proxmoxer import ProxmoxAPI
 
 from chaotic.cloud import Chaotic
 from chaotic.log import log
 
-PROXMOX_API_HOST = os.getenv('PROXMOX_API_HOST')
-PROXMOX_API_USER = os.getenv('PROXMOX_API_USER', 'root@pam')
-PROXMOX_API_PASSWORD = os.getenv('PROXMOX_API_PASSWORD')
-PROXMOX_API_VERIFY_SSL = bool(os.getenv('PROXMOX_API_VERIFY_SSL', False))
+PROXMOX_API_HOST: str = os.getenv("PROXMOX_API_HOST", "")
+PROXMOX_API_USER: str = os.getenv("PROXMOX_API_USER", 'root@pam')
+PROXMOX_API_PASSWORD: str = os.getenv("ROXMOX_API_PASSWORD", "")
+PROXMOX_API_VERIFY_SSL: bool = bool(os.getenv('PROXMOX_API_VERIFY_SSL', False))
 
 
 class ProxmoxKvmChaotic(Chaotic):
diff --git a/chaotic/cloud/vultr.py b/chaotic/cloud/vultr.py
index 3188894..53e5015 100644
--- a/chaotic/cloud/vultr.py
+++ b/chaotic/cloud/vultr.py
@@ -1,13 +1,14 @@
 import os
 import random
 import time
+from typing import List, Optional
+
 import requests
-from typing import List
 
 from chaotic.cloud import Chaotic
 from chaotic.log import log
 
-VULTR_API_KEY: str = os.getenv('VULTR_API_KEY')
+VULTR_API_KEY: str = os.getenv('VULTR_API_KEY', "")
 
 
 class Vultr:
@@ -17,7 +18,7 @@ class Vultr:
     def __init__(self, api_key: str) -> None:
         self.api_key = api_key
 
-    def query_api(self, method: str, path: str, params: dict = None, json: dict = None) -> requests.Response:
+    def query_api(self, method: str, path: str, params: Optional[dict] = None, json: Optional[dict] = None) -> requests.Response:
         r = requests.request(
             method=method,
             url=f"{self.VULTR_API_URL}/{path}",