diff --git a/Cargo.lock b/Cargo.lock
index 0b7146634..992131bc5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1457,7 +1457,7 @@ dependencies = [
 [[package]]
 name = "fsrs"
 version = "0.1.0"
-source = "git+https://github.com/open-spaced-repetition/fsrs-rs.git?rev=67163045ba9916e8a41f384fdb5ea414773139bd#67163045ba9916e8a41f384fdb5ea414773139bd"
+source = "git+https://github.com/open-spaced-repetition/fsrs-rs.git?rev=96ae7fca09f17723ec514a1d633d36c3a09779f4#96ae7fca09f17723ec514a1d633d36c3a09779f4"
 dependencies = [
  "burn",
  "itertools 0.11.0",
diff --git a/Cargo.toml b/Cargo.toml
index a980bbb88..00854443d 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 = "67163045ba9916e8a41f384fdb5ea414773139bd"
+rev = "96ae7fca09f17723ec514a1d633d36c3a09779f4"
 # path = "../../../fsrs-rs"
 
 [workspace.dependencies]
diff --git a/ftl/core/deck-config.ftl b/ftl/core/deck-config.ftl
index 59f89160f..fbc61bc15 100644
--- a/ftl/core/deck-config.ftl
+++ b/ftl/core/deck-config.ftl
@@ -330,6 +330,8 @@ deck-config-which-deck = Which deck would you like to display options for?
 deck-config-updating-cards = Updating cards: { $current_cards_count }/{ $total_cards_count }...
 deck-config-invalid-weights = Parameters must be either left blank to use the defaults, or must be 17 comma-separated numbers.
 deck-config-not-enough-history = Insufficient review history to perform this operation.
+deck-config-unable-to-determine-desired-retention =
+    Unable to determine an optimal retention.
 deck-config-must-have-1000-reviews =
     { $count ->
         [one] Only { $count } review was found.
@@ -352,6 +354,7 @@ deck-config-fsrs-on-all-clients =
     not work correctly if one of your clients is older.
 deck-config-estimated-retention = Estimated retention: { $num }
 deck-config-complete = { $num }% complete.
+deck-config-iterations = Iteration: { $count }...
 deck-config-reschedule-cards-on-change = Reschedule cards on change
 deck-config-fsrs-tooltip =
     The Free Spaced Repetition Scheduler (FSRS) is an alternative to Anki's legacy SuperMemo 2 (SM2) scheduler.
diff --git a/rslib/src/backend/error.rs b/rslib/src/backend/error.rs
index 7895d7204..da7addf51 100644
--- a/rslib/src/backend/error.rs
+++ b/rslib/src/backend/error.rs
@@ -43,6 +43,7 @@ impl AnkiError {
             AnkiError::InvalidMethodIndex
             | AnkiError::InvalidServiceIndex
             | AnkiError::FsrsWeightsInvalid
+            | AnkiError::FsrsUnableToDetermineDesiredRetention
             | AnkiError::FsrsInsufficientData => Kind::InvalidInput,
             #[cfg(windows)]
             AnkiError::WindowsError { .. } => Kind::OsError,
diff --git a/rslib/src/error/mod.rs b/rslib/src/error/mod.rs
index 87c128b45..47ad88fbe 100644
--- a/rslib/src/error/mod.rs
+++ b/rslib/src/error/mod.rs
@@ -115,6 +115,7 @@ pub enum AnkiError {
     InvalidServiceIndex,
     FsrsWeightsInvalid,
     FsrsInsufficientData,
+    FsrsUnableToDetermineDesiredRetention,
     SchedulerUpgradeRequired,
 }
 
@@ -174,6 +175,9 @@ impl AnkiError {
             }
             #[cfg(windows)]
             AnkiError::WindowsError { source } => format!("{source:?}"),
+            AnkiError::FsrsUnableToDetermineDesiredRetention => tr
+                .deck_config_unable_to_determine_desired_retention()
+                .into(),
         }
     }
 
diff --git a/rslib/src/scheduler/fsrs/error.rs b/rslib/src/scheduler/fsrs/error.rs
index bf25c5d72..fbea5eacf 100644
--- a/rslib/src/scheduler/fsrs/error.rs
+++ b/rslib/src/scheduler/fsrs/error.rs
@@ -9,6 +9,7 @@ impl From<FSRSError> for AnkiError {
     fn from(err: FSRSError) -> Self {
         match err {
             FSRSError::NotEnoughData => AnkiError::FsrsInsufficientData,
+            FSRSError::OptimalNotFound => AnkiError::FsrsUnableToDetermineDesiredRetention,
             FSRSError::Interrupted => AnkiError::Interrupted,
             FSRSError::InvalidWeights => AnkiError::FsrsWeightsInvalid,
         }
diff --git a/rslib/src/scheduler/fsrs/retention.rs b/rslib/src/scheduler/fsrs/retention.rs
index d4c8f05ee..444cb1201 100644
--- a/rslib/src/scheduler/fsrs/retention.rs
+++ b/rslib/src/scheduler/fsrs/retention.rs
@@ -55,7 +55,6 @@ impl Collection {
                 |ip| {
                     anki_progress
                         .update(false, |p| {
-                            p.total = ip.total as u32;
                             p.current = ip.current as u32;
                         })
                         .is_ok()
diff --git a/ts/deck-options/FsrsOptions.svelte b/ts/deck-options/FsrsOptions.svelte
index f348fc025..9a0650818 100644
--- a/ts/deck-options/FsrsOptions.svelte
+++ b/ts/deck-options/FsrsOptions.svelte
@@ -180,10 +180,7 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
                     optimalRetentionRequest.search = `preset:"${state.getCurrentName()}"`;
                     const resp = await computeOptimalRetention(optimalRetentionRequest);
                     optimalRetention = resp.optimalRetention;
-                    if (computeRetentionProgress) {
-                        computeRetentionProgress.current =
-                            computeRetentionProgress.total;
-                    }
+                    computeRetentionProgress = undefined;
                 },
                 (progress) => {
                     if (progress.value.case === "computeRetention") {
@@ -217,11 +214,10 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
     function renderRetentionProgress(
         val: ComputeRetentionProgress | undefined,
     ): String {
-        if (!val || !val.total) {
+        if (!val) {
             return "";
         }
-        const pct = ((val.current / val.total) * 100).toFixed(0);
-        return tr.deckConfigComplete({ num: pct });
+        return tr.deckConfigIterations({ count: val.current });
     }
 
     function estimatedRetention(retention: number): String {