diff --git a/.github/actions/fetch-vectors/action.yml b/.github/actions/fetch-vectors/action.yml
index bd7923531ead..f5f9771c301c 100644
--- a/.github/actions/fetch-vectors/action.yml
+++ b/.github/actions/fetch-vectors/action.yml
@@ -30,5 +30,5 @@ runs:
       env:
         # Latest commit on the wycheproof main branch, as of Aug 19, 2026.
         WYCHEPROOF_REF: "dac1dd4729fd1f8dd9e1e9f3dce51d783da6c166" # wycheproof-ref
-        # Latest commit on the x509-limbo main branch, as of Aug 28, 2026.
-        X509_LIMBO_REF: "972626160c26b45426bbd8c935a605219bd93207" # x509-limbo-ref
+        # Latest commit on the x509-limbo main branch, as of Sep 02, 2026.
+        X509_LIMBO_REF: "21cc053f7edbd22e0e8d8a98a7fe13918912af9d" # x509-limbo-ref