diff --git a/schemes/release-6.3/manifest.json b/schemes/release-6.3/manifest.json
index d1b81d8..90a3dca 100644
--- a/schemes/release-6.3/manifest.json
+++ b/schemes/release-6.3/manifest.json
@@ -1,6 +1,6 @@
 {
   "update-checkout-scheme": "release/6.3",
-  "base-tag": "swift-6.3-DEVELOPMENT-SNAPSHOT-2025-12-10-a",
+  "base-tag": "swift-6.3-DEVELOPMENT-SNAPSHOT-2025-12-13-a",
   "icu4c": [],
   "libxml2": [],
   "swift-org-download-channel": "swift-6.3-branch"