diff --git a/rslib/src/config/bool.rs b/rslib/src/config/bool.rs
index c76787cb0..1be9b2556 100644
--- a/rslib/src/config/bool.rs
+++ b/rslib/src/config/bool.rs
@@ -1,8 +1,6 @@
 // Copyright: Ankitects Pty Ltd and contributors
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
-use serde::Deserialize;
-use serde_aux::field_attributes::deserialize_bool_from_anything;
 use strum::IntoStaticStr;
 
 use crate::prelude::*;
@@ -56,15 +54,6 @@ pub enum BoolKey {
     AddingDefaultsToCurrentDeck,
 }
 
-/// This is a workaround for old clients that used ints to represent boolean
-/// values. For new config items, prefer using a bool directly.
-#[derive(Deserialize, Default)]
-struct BoolLike(
-    #[serde(deserialize_with = "deserialize_bool_from_anything")]
-    #[allow(dead_code)]
-    bool,
-);
-
 impl Collection {
     pub fn get_config_bool(&self, key: BoolKey) -> bool {
         match key {
diff --git a/rslib/src/revlog/mod.rs b/rslib/src/revlog/mod.rs
index fbb9b459a..3e22890b1 100644
--- a/rslib/src/revlog/mod.rs
+++ b/rslib/src/revlog/mod.rs
@@ -161,7 +161,7 @@ impl Collection {
     ) -> Result<()> {
         let ease_factor = u32::from(
             card.memory_state
-                .map(|s| ((s.difficulty_shifted() * 1000.) as u16))
+                .map(|s| (s.difficulty_shifted() * 1000.) as u16)
                 .unwrap_or(card.ease_factor),
         );
         let entry = RevlogEntry {
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 452c65213..cd563026b 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,3 +1,3 @@
 [toolchain]
 # older versions may fail to compile; newer versions may fail the clippy tests
-channel = "1.89.0"
+channel = "1.90.0"