diff --git a/vendor/nim-ssz-serialization b/vendor/nim-ssz-serialization
index 7d491f6f9..6688301e9 160000
--- a/vendor/nim-ssz-serialization
+++ b/vendor/nim-ssz-serialization
@@ -1 +1 @@
-Subproject commit 7d491f6f93bd323738f3644cbbc6cb3e50ea6e33
+Subproject commit 6688301e946b543f8d2677d0a944f9369e578628