diff --git a/pyproject.toml b/pyproject.toml
index 02ce4c0..9de0022 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "flatten-dict"
-version = "0.4.0"
+version = "0.4.1"
 description = "A flexible utility for flattening and unflattening dict-like objects in Python."
 authors = ["Ian Lin <you@example.com>"]
 license = "MIT"