diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1ba4a2d..b94f268 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [5.0.1] - 2024-08-12
+
+BUG: fix a crash in inifix-format on single-core machines
+
 ## [5.0.0] - 2024-08-09
 
 ### API changes
diff --git a/src/inifix/__init__.py b/src/inifix/__init__.py
index 3ed5f0d..dee75f4 100644
--- a/src/inifix/__init__.py
+++ b/src/inifix/__init__.py
@@ -5,4 +5,4 @@
 from .validation import validate_inifile_schema
 from .format import format_string
 
-__version__ = "5.0.0"
+__version__ = "5.0.1"
diff --git a/src/inifix/format.py b/src/inifix/format.py
index 1223d41..423fc28 100644
--- a/src/inifix/format.py
+++ b/src/inifix/format.py
@@ -168,7 +168,8 @@ def main(argv: list[str] | None = None) -> int:
         args_report_noop=args.report_noop,
         args_diff=args.diff,
     )
-    with ThreadPoolExecutor(max_workers=int((os.cpu_count() or 2) / 2)) as executor:
+    cpu_count = os.cpu_count() or 1
+    with ThreadPoolExecutor(max_workers=max(1, int(cpu_count / 2))) as executor:
         futures = [executor.submit(closure, file) for file in args.files]
         results = [f.result() for f in futures]