From b4578ce1598222d81cb6ed4e0eaa7092c9e3cd5a Mon Sep 17 00:00:00 2001
From: Jerome Kelleher <jk@well.ox.ac.uk>
Date: Fri, 14 Aug 2026 12:51:30 +0100
Subject: [PATCH] Update build-wheels workflow version to v21

Fix an error in Windows wheel builds
---
 .github/workflows/wheels.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/wheels.yml b/.github/workflows/wheels.yml
index 61fe2ea67c..39bf89ad79 100644
--- a/.github/workflows/wheels.yml
+++ b/.github/workflows/wheels.yml
@@ -12,7 +12,7 @@ permissions:
 jobs:
   build-wheels:
     if: "!startsWith(github.ref, 'refs/tags/C_')"
-    uses: tskit-dev/.github/.github/workflows/build-wheels.yml@v19
+    uses: tskit-dev/.github/.github/workflows/build-wheels.yml@v21
     with:
       pyproject-directory: python