diff --git a/README.rst b/README.rst
index 550a2c1..07813aa 100644
--- a/README.rst
+++ b/README.rst
@@ -51,6 +51,11 @@ While bcrypt remains an acceptable choice for password storage, depending on you
 Changelog
 =========
 
+4.1.1
+-----
+
+* Fixed the type signature on the ``kdf`` method.
+
 4.1.0
 -----
 
diff --git a/pyproject.toml b/pyproject.toml
index 0d4dae6..67b6fad 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ build-backend = "setuptools.build_meta"
 [project]
 name = "bcrypt"
 # When updating this, also update lib.rs
-version = "4.1.0"
+version = "4.1.1"
 authors = [
     {name = "The Python Cryptographic Authority developers", email = "cryptography-dev@python.org"}
 ]
diff --git a/src/_bcrypt/src/lib.rs b/src/_bcrypt/src/lib.rs
index 6e47475..2d4c80f 100644
--- a/src/_bcrypt/src/lib.rs
+++ b/src/_bcrypt/src/lib.rs
@@ -183,7 +183,7 @@ fn _bcrypt(_py: pyo3::Python<'_>, m: &pyo3::types::PyModule) -> pyo3::PyResult<(
     m.add("__uri__", "https://github.com/pyca/bcrypt/")?;
 
     // When updating this, also update pyproject.toml
-    m.add("__version__", "4.1.0")?;
+    m.add("__version__", "4.1.1")?;
 
     let author = "The Python Cryptographic Authority developers";
     m.add("__author__", author)?;
diff --git a/src/bcrypt/__init__.pyi b/src/bcrypt/__init__.pyi
index 0450d19..12e4a2e 100644
--- a/src/bcrypt/__init__.pyi
+++ b/src/bcrypt/__init__.pyi
@@ -4,7 +4,7 @@ def checkpw(password: bytes, hashed_password: bytes) -> bool: ...
 def kdf(
     password: bytes,
     salt: bytes,
-    rounds: int,
     desired_key_bytes: int,
+    rounds: int,
     ignore_few_rounds: bool = False,
 ) -> bytes: ...