diff --git a/vendor/nim-ssz-serialization b/vendor/nim-ssz-serialization
index 3b1f866e4..947f39fd3 160000
--- a/vendor/nim-ssz-serialization
+++ b/vendor/nim-ssz-serialization
@@ -1 +1 @@
-Subproject commit 3b1f866e419527fdd4b36d054e94678c3035b879
+Subproject commit 947f39fd34f3e73dc5b9465600e84ab98e848a56