diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d5898c7c2..cf8fb6ba4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -38,6 +38,12 @@ jobs:
         with:
           submodules: false
 
+      - name: Force UTF-8 output (Windows)
+        run: |
+          chcp.com 65001
+          echo "LANG=en_US.UTF-8" >> "$GITHUB_ENV"
+          echo "LC_ALL=en_US.UTF-8" >> "$GITHUB_ENV"
+
       - name: Checkout submodules (retry)
         run: |
           set -euo pipefail