diff --git a/.github/actions/fetch-vectors/action.yml b/.github/actions/fetch-vectors/action.yml
index f124518dc305..43b3e629ffb8 100644
--- a/.github/actions/fetch-vectors/action.yml
+++ b/.github/actions/fetch-vectors/action.yml
@@ -16,5 +16,5 @@ runs:
       with:
         repository: "C2SP/x509-limbo"
         path: "x509-limbo"
-        # Latest commit on the x509-limbo main branch, as of Sep 03, 2024.
-        ref: "c77f95adb01d2d0f1389c52530201b75b1e8c82c" # x509-limbo-ref
+        # Latest commit on the x509-limbo main branch, as of Sep 04, 2024.
+        ref: "21e4b22c4b1b69cc956bd6bb0db2c3e40c3f46e9" # x509-limbo-ref