diff --git a/Cargo.lock b/Cargo.lock
index 944852d9b..d5e7ac5c2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1813,7 +1813,7 @@ dependencies = [
 [[package]]
 name = "fsrs"
 version = "0.1.0"
-source = "git+https://github.com/open-spaced-repetition/fsrs-rs.git?rev=f45f46bdba6625f03677eaeb039dd8a6ffcad688#f45f46bdba6625f03677eaeb039dd8a6ffcad688"
+source = "git+https://github.com/open-spaced-repetition/fsrs-rs.git?rev=58ca25ed2bc4bb1dc376208bbcaed7f5a501b941#58ca25ed2bc4bb1dc376208bbcaed7f5a501b941"
 dependencies = [
  "burn",
  "itertools 0.12.0",
diff --git a/Cargo.toml b/Cargo.toml
index 6a57cf2c6..108f20de9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -36,7 +36,7 @@ rev = "184b2ca50ed39ca43da13f0b830a463861adb9ca"
 
 [workspace.dependencies.fsrs]
 git = "https://github.com/open-spaced-repetition/fsrs-rs.git"
-rev = "f45f46bdba6625f03677eaeb039dd8a6ffcad688"
+rev = "58ca25ed2bc4bb1dc376208bbcaed7f5a501b941"
 # path = "../../../fsrs-rs"
 
 [workspace.dependencies]
diff --git a/rslib/src/scheduler/fsrs/memory_state.rs b/rslib/src/scheduler/fsrs/memory_state.rs
index 3e0793c97..38af726af 100644
--- a/rslib/src/scheduler/fsrs/memory_state.rs
+++ b/rslib/src/scheduler/fsrs/memory_state.rs
@@ -341,7 +341,7 @@ mod tests {
             item.starting_state,
             Some(MemoryState {
                 stability: 99.999954,
-                difficulty: 4.966779,
+                difficulty: 5.8158145
             })
         );
         let mut card = Card {
@@ -352,8 +352,8 @@ mod tests {
         assert_eq!(
             card.memory_state,
             Some(FsrsMemoryState {
-                stability: 248.65475,
-                difficulty: 4.9747725,
+                stability: 248.65057,
+                difficulty: 5.782729
             })
         );
         // but if there's only a single revlog entry, we'll fall back on current card
@@ -377,7 +377,7 @@ mod tests {
             card.memory_state,
             Some(FsrsMemoryState {
                 stability: 122.99994,
-                difficulty: 6.859577
+                difficulty: 7.4459267
             })
         );
         Ok(())
@@ -401,7 +401,7 @@ mod tests {
             Some(
                 MemoryState {
                     stability: 99.999954,
-                    difficulty: 9.793356
+                    difficulty: 9.963163
                 }
                 .into()
             )