diff --git a/lib/zsync2 b/lib/zsync2
index c679907..6ac10c3 160000
--- a/lib/zsync2
+++ b/lib/zsync2
@@ -1 +1 @@
-Subproject commit c679907f6bfc11b98f80a3a8900ac6493ebff060
+Subproject commit 6ac10c31d6aa71bea16509d8f3f385f353c46ed1