diff --git a/nvchecker/__main__.py b/nvchecker/__main__.py
index 2fc5ca5..4da9aae 100755
--- a/nvchecker/__main__.py
+++ b/nvchecker/__main__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 # MIT licensed
-# Copyright (c) 2013-2020 lilydjwg <lilydjwg@gmail.com>, et al.
+# Copyright (c) 2013-2022 lilydjwg <lilydjwg@gmail.com>, et al.
 
 from __future__ import annotations
 
@@ -25,6 +25,8 @@ def main() -> None:
                       help='use specified keyfile (override the one in configuration file)')
   parser.add_argument('-t', '--tries', default=1, type=int, metavar='N',
                       help='try N times when network errors occur')
+  parser.add_argument('--failures', action='store_true',
+                      help='exit with code 3 if failures / errors happen during checking')
   parser.add_argument('-e', '--entry', type=str,
                       help='only execute on specified entry (useful for debugging)')
   core.add_common_arguments(parser)
@@ -76,11 +78,14 @@ def main() -> None:
   result_coro = core.process_result(oldvers, result_q, entry_waiter)
   runner_coro = core.run_tasks(futures)
 
-  newvers = asyncio.run(run(result_coro, runner_coro))
+  newvers, has_failures = asyncio.run(run(result_coro, runner_coro))
 
   if options.ver_files is not None:
     core.write_verfile(options.ver_files[1], newvers)
 
+  if args.failures and has_failures:
+    sys.exit(3)
+
 async def run(
   result_coro: Coroutine[None, None, VersData],
   runner_coro: Coroutine[None, None, None],
diff --git a/nvchecker/core.py b/nvchecker/core.py
index b6e866f..9e75e0f 100644
--- a/nvchecker/core.py
+++ b/nvchecker/core.py
@@ -360,20 +360,22 @@ async def process_result(
   oldvers: VersData,
   result_q: Queue[RawResult],
   entry_waiter: EntryWaiter,
-) -> VersData:
+) -> Tuple[VersData, bool]:
   ret = {}
+  has_failures = False
   try:
     while True:
       r = await result_q.get()
       r1 = _process_result(r)
       if isinstance(r1, Exception):
         entry_waiter.set_exception(r.name, r1)
+        has_failures = True
         continue
       check_version_update(oldvers, r1.name, r1.version)
       entry_waiter.set_result(r1.name, r1.version)
       ret[r1.name] = r1.version
   except asyncio.CancelledError:
-    return ret
+    return ret, has_failures
 
 async def run_tasks(
   futures: Sequence[Awaitable[None]]