diff --git a/CHANGES.rst b/CHANGES.rst
index 4a2a938e08..377273f68b 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,6 @@
 .. currentmodule:: click
 
-Version 8.4.dev
+Version 8.4.1
 ------------------
 
 Unreleased
diff --git a/pyproject.toml b/pyproject.toml
index d4d40e2e12..833209b67a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "click"
-version = "8.4.dev"
+version = "8.4.1.dev"
 description = "Composable command line interface toolkit"
 readme = "README.md"
 license = "BSD-3-Clause"
diff --git a/src/click/testing.py b/src/click/testing.py
index 1eb81d29ed..7d0100bc06 100644
--- a/src/click/testing.py
+++ b/src/click/testing.py
@@ -22,7 +22,11 @@
 
     from .core import Command
 
-CaptureMode = t.Literal["sys", "fd"]
+
+if sys.platform == "win32":
+    CaptureMode: t.TypeAlias = t.Literal["sys"]  # pyright: ignore[reportRedeclaration]
+else:
+    CaptureMode: t.TypeAlias = t.Literal["sys", "fd"]  # pyright: ignore[reportRedeclaration]
 
 
 class EchoingStdin:
diff --git a/uv.lock b/uv.lock
index 9b2d6d0fa9..5f7aca8d4e 100644
--- a/uv.lock
+++ b/uv.lock
@@ -173,7 +173,7 @@ wheels = [
 
 [[package]]
 name = "click"
-version = "8.4.dev0"
+version = "8.4.1.dev0"
 source = { editable = "." }
 dependencies = [
     { name = "colorama", marker = "sys_platform == 'win32'" },