diff --git a/src/fsrs4tw b/src/fsrs4tw
index e1579de..e5be317 160000
--- a/src/fsrs4tw
+++ b/src/fsrs4tw
@@ -1 +1 @@
-Subproject commit e1579debe49be85b1ecd6576d3ec301309466ceb
+Subproject commit e5be3172d270bf7d14a2dd3151b7244afe6f03a0