diff --git a/nyacme/__main__.py b/nyacme/__main__.py
index f6d6b39..128a96f 100644
--- a/nyacme/__main__.py
+++ b/nyacme/__main__.py
@@ -64,7 +64,8 @@ def main() -> None:
             '--type', 'EC',
             # '--force',
             'issue',
-        ] + uacme_domains, env=env)
+            *uacme_domains,
+        ], env=env)
 
         if res.returncode == 0:
             acquired = True
diff --git a/nyacme/handlers/cloudflare.py b/nyacme/handlers/cloudflare.py
index 4f2e266..f815c94 100644
--- a/nyacme/handlers/cloudflare.py
+++ b/nyacme/handlers/cloudflare.py
@@ -17,12 +17,12 @@ class CloudflareHandler(Handler):
         self.secret = config.get_secret('cloudflare')
 
         servers = dns.resolver.resolve(zone_name, 'NS')
-        self.nameservers = list(map(lambda rdata: str(rdata.target).strip('.'), servers))
+        self.nameservers = [ str(rdata.target).strip('.') for rdata in servers ]
 
     def run(self, args: list[str]) -> Any:
         env = os.environ.copy()
         env['CF_API_TOKEN'] = self.secret
-        res = subprocess.run(['flarectl', '--json'] + args, check=True, stdout=subprocess.PIPE, env=env)
+        res = subprocess.run(['flarectl', '--json', *args], check=True, stdout=subprocess.PIPE, env=env)
         try:
             return json.loads(res.stdout)
         except json.decoder.JSONDecodeError as ex:
diff --git a/nyacme/handlers/he.py b/nyacme/handlers/he.py
index e531821..cf2552e 100644
--- a/nyacme/handlers/he.py
+++ b/nyacme/handlers/he.py
@@ -7,10 +7,9 @@ from .base import Handler
 
 
 class HEHandler(Handler):
-    nameservers = ['ns1.he.net', 'ns2.he.net', 'ns3.he.net', 'ns4.he.net', 'ns5.he.net']
-
     def __init__(self, zone_name: str, config: Config, token: str) -> None:
         super().__init__(zone_name, config, token)
+        self.nameservers = ['ns1.he.net', 'ns2.he.net', 'ns3.he.net', 'ns4.he.net', 'ns5.he.net']
         self.password = config.get_secret('he')
 
     def set_record(self, record_name: str, value: str) -> Any:
diff --git a/nyacme/hook.py b/nyacme/hook.py
index 0f3cd1a..cdc9792 100644
--- a/nyacme/hook.py
+++ b/nyacme/hook.py
@@ -62,7 +62,7 @@ def main() -> None:
             log.info('checking DNS (attempt %d/5)', i+1)
             try:
                 res = resolver.resolve(record_name, 'TXT')
-                values = list(map(lambda rdata: rdata.to_text().strip('"'), res))
+                values = [ rdata.to_text().strip('"') for rdata in res ]
             except (dns.resolver.NXDOMAIN, dns.resolver.NoAnswer):
                 values = []
             log.info('response from DNS: %s', values)