diff --git a/schemes/release-6.1/manifest.json b/schemes/release-6.1/manifest.json
index 127bafe9..25b7046c 100644
--- a/schemes/release-6.1/manifest.json
+++ b/schemes/release-6.1/manifest.json
@@ -1,6 +1,6 @@
 {
   "update-checkout-scheme": "release/6.1",
-  "base-tag": "swift-6.1-DEVELOPMENT-SNAPSHOT-2024-12-20-a",
+  "base-tag": "swift-6.1-DEVELOPMENT-SNAPSHOT-2024-12-21-a",
   "build-compiler": false,
   "icu4c": [],
   "libxml2": [