diff --git a/Cargo.lock b/Cargo.lock
index cd2f3f7..2fcd568 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -730,7 +730,7 @@ checksum = "aa9a19cbb55df58761df49b23516a86d432839add4af60fc256da840f66ed35b"
 
 [[package]]
 name = "fsrs"
-version = "0.6.0"
+version = "0.6.1"
 dependencies = [
  "burn",
  "chrono",
diff --git a/fsrs-rs b/fsrs-rs
index 92629c0..9e5c18e 160000
--- a/fsrs-rs
+++ b/fsrs-rs
@@ -1 +1 @@
-Subproject commit 92629c05bb6aa497e7f78e339b73db17e0e57f93
+Subproject commit 9e5c18e8fd747c78ea2d794cc34c6be0dbe1c907