diff --git a/lib/rt64 b/lib/rt64
index 0a33064..691ec80 160000
--- a/lib/rt64
+++ b/lib/rt64
@@ -1 +1 @@
-Subproject commit 0a330643bb18e7eddb9c9cf324a668a0d66d7516
+Subproject commit 691ec800c071b34b5e191119b295d5b6e349a809