diff --git a/Cargo.lock b/Cargo.lock
index e43dda746..fddb77d5a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -270,13 +270,13 @@ dependencies = [
 
 [[package]]
 name = "async-trait"
-version = "0.1.89"
+version = "0.1.92"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9035ad2d096bed7955a320ee7e2230574d28fd3c3a0f186cbea1ff3c7eed5dbb"
+checksum = "82f6aeea286b8eb4dd3431a1be1b59d290ace00f5bfd8e2a159bc2a05e2c1667"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.117",
+ "syn 3.0.6",
 ]
 
 [[package]]
@@ -11005,6 +11005,17 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "syn"
+version = "3.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8593e8e72159ed2257d083c7a454a85cbf854f37a0966d8d483aff8c8a3ebcee"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
 [[package]]
 name = "sync_wrapper"
 version = "1.0.2"
diff --git a/crates/fakecloud-s3/src/service/annotations.rs b/crates/fakecloud-s3/src/service/annotations.rs
index a9e168605..fce583dc4 100644
--- a/crates/fakecloud-s3/src/service/annotations.rs
+++ b/crates/fakecloud-s3/src/service/annotations.rs
@@ -436,7 +436,7 @@ fn resolve_object_mut<'a>(
                     o.version_id.as_deref() == Some(vid.as_str())
                 }
             };
-            if b.objects.get(key).is_some_and(&matches) {
+            if b.objects.get(key).is_some_and(matches) {
                 return b.objects.get_mut(key).ok_or_else(|| no_such_key(key));
             }
             b.object_versions
diff --git a/crates/fakecloud-s3/src/service/notifications.rs b/crates/fakecloud-s3/src/service/notifications.rs
index 1e0767850..8813145af 100644
--- a/crates/fakecloud-s3/src/service/notifications.rs
+++ b/crates/fakecloud-s3/src/service/notifications.rs
@@ -398,6 +398,10 @@ static SEQUENCER: std::sync::atomic::AtomicU64 = std::sync::atomic::AtomicU64::n
 pub(crate) fn next_sequencer() -> String {
     use std::sync::atomic::Ordering;
     let now = Utc::now().timestamp_micros().max(0) as u64;
+    // `fetch_update` is deprecated in favour of `try_update` from Rust 1.99,
+    // which is newer than the workspace's `rust-version`. Switch once the
+    // MSRV reaches 1.99.
+    #[allow(deprecated)]
     let prev = SEQUENCER
         .fetch_update(Ordering::SeqCst, Ordering::SeqCst, |prev| {
             Some(now.max(prev.saturating_add(1)))
diff --git a/crates/fakecloud-ses/src/service/templates.rs b/crates/fakecloud-ses/src/service/templates.rs
index 389189ea5..04827ea19 100644
--- a/crates/fakecloud-ses/src/service/templates.rs
+++ b/crates/fakecloud-ses/src/service/templates.rs
@@ -274,8 +274,8 @@ pub fn render_template(template: &EmailTemplate, template_data_str: &str) -> Ren
         result
     };
     RenderedTemplate {
-        subject: template.subject.as_deref().map(&substitute),
-        html: template.html_body.as_deref().map(&substitute),
-        text: template.text_body.as_deref().map(&substitute),
+        subject: template.subject.as_deref().map(substitute),
+        html: template.html_body.as_deref().map(substitute),
+        text: template.text_body.as_deref().map(substitute),
     }
 }