diff --git a/changes/3430.misc.rst b/changes/3430.misc.rst
new file mode 100644
index 0000000000..2e31f6c052
--- /dev/null
+++ b/changes/3430.misc.rst
@@ -0,0 +1 @@
+Updated setuptools from 80.3.1 to 80.4.0 in /winforms.
diff --git a/winforms/pyproject.toml b/winforms/pyproject.toml
index f2d0d954c9..bceaf4a775 100644
--- a/winforms/pyproject.toml
+++ b/winforms/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
 requires = [
-    "setuptools==80.3.1",
+    "setuptools==80.4.0",
     "setuptools_scm==8.3.1",
     "setuptools_dynamic_dependencies==1.0.0",
 ]