diff --git a/tasks.py b/tasks.py
index cb2927f..f01dabb 100644
--- a/tasks.py
+++ b/tasks.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2023 Lance Edgar
+#  Copyright © 2010-2024 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -45,7 +45,7 @@ def release(c):
     c.run('python -m build --sdist')
 
     # filename of built package
-    filename = 'rattail-nationbuilder-{}.tar.gz'.format(__version__)
+    filename = f'rattail_nationbuilder-{__version__}.tar.gz'
 
     # upload to PyPI
     c.run('twine upload dist/{}'.format(filename))