diff --git a/bin/mock-server/src/lib/lib.rs b/bin/mock-server/src/lib/lib.rs
index 6f034f94c..345738a43 100644
--- a/bin/mock-server/src/lib/lib.rs
+++ b/bin/mock-server/src/lib/lib.rs
@@ -12,7 +12,7 @@ use dropshot::{
     TypedBody, WebsocketConnection,
 };
 use futures::SinkExt;
-use slog::{error, o, Logger};
+use slog::{o, Logger};
 use std::collections::BTreeMap;
 use thiserror::Error;
 use tokio::sync::{watch, Mutex};
diff --git a/bin/propolis-server/src/lib/migrate/codec.rs b/bin/propolis-server/src/lib/migrate/codec.rs
index c4ef64ae9..d34afa9b9 100644
--- a/bin/propolis-server/src/lib/migrate/codec.rs
+++ b/bin/propolis-server/src/lib/migrate/codec.rs
@@ -23,7 +23,6 @@
 use super::MigrateError;
 
 use bytes::{Buf, BufMut, Bytes};
-use slog::error;
 use strum::FromRepr;
 use thiserror::Error;
 use tokio_tungstenite::tungstenite;
diff --git a/bin/propolis-server/src/lib/migrate/destination.rs b/bin/propolis-server/src/lib/migrate/destination.rs
index 26a297d04..26b8f59c6 100644
--- a/bin/propolis-server/src/lib/migrate/destination.rs
+++ b/bin/propolis-server/src/lib/migrate/destination.rs
@@ -749,7 +749,7 @@ impl<T: MigrateConn> RonV0<T> {
                 if count != 0 {
                     return Err(MigrateError::DeviceState(format!(
                         "Found {} unconsumed payload(s) for device {}",
-                        count, &device.instance_name,
+                        count, device.instance_name,
                     )));
                 }
             }
diff --git a/bin/propolis-server/src/lib/migrate/mod.rs b/bin/propolis-server/src/lib/migrate/mod.rs
index 2145dd3c3..858e6846e 100644
--- a/bin/propolis-server/src/lib/migrate/mod.rs
+++ b/bin/propolis-server/src/lib/migrate/mod.rs
@@ -7,7 +7,6 @@ use dropshot::HttpError;
 use propolis::migrate::MigrateStateError;
 use propolis_api_types::migration::MigrationState;
 use serde::{Deserialize, Serialize};
-use slog::error;
 use thiserror::Error;
 use tokio::io::{AsyncRead, AsyncWrite};
 
diff --git a/bin/propolis-server/src/lib/spec/api_spec_v0.rs b/bin/propolis-server/src/lib/spec/api_spec_v0.rs
index 4aa0d3e21..e9c1f1959 100644
--- a/bin/propolis-server/src/lib/spec/api_spec_v0.rs
+++ b/bin/propolis-server/src/lib/spec/api_spec_v0.rs
@@ -94,7 +94,7 @@ impl From<Spec> for v1::instance_spec::InstanceSpec {
             assert!(
                 !spec.components.contains_key(&key),
                 "component name {} already exists in output spec",
-                &key
+                key
             );
             spec.components.insert(key, val);
         }
diff --git a/bin/propolis-server/src/lib/vcpu_tasks.rs b/bin/propolis-server/src/lib/vcpu_tasks.rs
index d2b2d4dd7..3870033c3 100644
--- a/bin/propolis-server/src/lib/vcpu_tasks.rs
+++ b/bin/propolis-server/src/lib/vcpu_tasks.rs
@@ -65,7 +65,7 @@ impl VcpuTasks {
 
         let mut tasks = Vec::new();
         for (vcpu, bind_cpu) in
-            machine.vcpus.iter().map(Arc::clone).zip(bindings.into_iter())
+            machine.vcpus.iter().map(Arc::clone).zip(bindings)
         {
             let (task, ctrl) =
                 propolis::tasks::TaskHdl::new_held(Some(vcpu.barrier_fn()));
diff --git a/bin/propolis-standalone/Cargo.toml b/bin/propolis-standalone/Cargo.toml
index 41df0cb0b..f0e005f4d 100644
--- a/bin/propolis-standalone/Cargo.toml
+++ b/bin/propolis-standalone/Cargo.toml
@@ -3,7 +3,7 @@ name = "propolis-standalone"
 version = "0.1.0"
 license = "MPL-2.0"
 edition = "2021"
-rust-version = "1.73"
+rust-version = "1.93"
 
 [[bin]]
 name = "propolis-standalone"
diff --git a/bin/propolis-standalone/src/main.rs b/bin/propolis-standalone/src/main.rs
index 68bfd4901..a2e2b6c44 100644
--- a/bin/propolis-standalone/src/main.rs
+++ b/bin/propolis-standalone/src/main.rs
@@ -130,14 +130,13 @@ impl EventQueue {
         let mut inner = self.inner.lock().unwrap();
         while let Some((ev, ctx)) = inner.events.pop_front() {
             match cur {
-                Some(cur_ev) => {
-                    if cur_ev.supersedes(&ev) {
-                        // queued event is superseded by current one, so discard
-                        // it and look for another which may be relevant.
-                        continue;
-                    } else {
-                        return Some((ev, ctx));
-                    }
+                Some(cur_ev) if cur_ev.supersedes(&ev) => {
+                    // queued event is superseded by current one, so discard
+                    // it and look for another which may be relevant.
+                    continue;
+                }
+                Some(_) => {
+                    return Some((ev, ctx));
                 }
                 None => return Some((ev, ctx)),
             }
@@ -327,7 +326,7 @@ impl Instance {
         };
 
         for (vcpu, bind_cpu) in
-            machine.vcpus.iter().map(Arc::clone).zip(bind_cpus.into_iter())
+            machine.vcpus.iter().map(Arc::clone).zip(bind_cpus)
         {
             let (task, ctrl) =
                 propolis::tasks::TaskHdl::new_held(Some(vcpu.barrier_fn()));
@@ -406,14 +405,14 @@ impl Instance {
         match state {
             State::Run if first_boot => {
                 tokio::runtime::Handle::current().block_on(async {
-                    for (_name, be) in guard.inventory.block.iter() {
+                    for be in guard.inventory.block.values() {
                         be.start().await.expect("blockdev start succeeds");
                     }
                 });
             }
             State::Halt => {
                 tokio::runtime::Handle::current().block_on(async {
-                    for (_name, be) in guard.inventory.block.iter() {
+                    for be in guard.inventory.block.values() {
                         be.stop().await;
                         be.attachment().detach();
                     }
@@ -1419,11 +1418,7 @@ fn setup_instance(
                 }
                 _ => {
                     slog::error!(log, "unrecognized driver {driver}"; "name" => name);
-                    return Err(Error::new(
-                        ErrorKind::Other,
-                        "Unrecognized driver",
-                    )
-                    .into());
+                    return Err(Error::other("Unrecognized driver").into());
                 }
             };
             Ok(())
diff --git a/crates/cpuid-utils/src/host.rs b/crates/cpuid-utils/src/host.rs
index 3e79011d5..3ed323078 100644
--- a/crates/cpuid-utils/src/host.rs
+++ b/crates/cpuid-utils/src/host.rs
@@ -80,10 +80,8 @@ impl Drop for Vm {
 /// Queries the supplied CPUID leaf on the caller's machine.
 #[cfg(target_arch = "x86_64")]
 pub fn query(leaf: CpuidIdent) -> CpuidValues {
-    unsafe {
-        core::arch::x86_64::__cpuid_count(leaf.leaf, leaf.subleaf.unwrap_or(0))
-    }
-    .into()
+    core::arch::x86_64::__cpuid_count(leaf.leaf, leaf.subleaf.unwrap_or(0))
+        .into()
 }
 
 #[cfg(not(target_arch = "x86_64"))]
diff --git a/lib/propolis/Cargo.toml b/lib/propolis/Cargo.toml
index 786013d7b..180f1ae31 100644
--- a/lib/propolis/Cargo.toml
+++ b/lib/propolis/Cargo.toml
@@ -3,7 +3,7 @@ name = "propolis"
 version = "0.1.0"
 license = "MPL-2.0"
 edition = "2021"
-rust-version = "1.90"
+rust-version = "1.93"
 
 [dependencies]
 libc.workspace = true
diff --git a/lib/propolis/src/hw/virtio/queue.rs b/lib/propolis/src/hw/virtio/queue.rs
index 9c9925505..4d50489c2 100644
--- a/lib/propolis/src/hw/virtio/queue.rs
+++ b/lib/propolis/src/hw/virtio/queue.rs
@@ -520,7 +520,6 @@ impl VirtQueue {
                     false => ChainBuf::Readable(GuestAddr(desc.addr), desc.len),
                 };
 
-                count += 1;
                 len += desc.len;
                 chain.push_buf(buf);
 
diff --git a/lib/propolis/src/vcpu.rs b/lib/propolis/src/vcpu.rs
index c2010fa33..ae2f0f2cf 100644
--- a/lib/propolis/src/vcpu.rs
+++ b/lib/propolis/src/vcpu.rs
@@ -76,7 +76,7 @@ impl Vcpu {
     ) -> Arc<Self> {
         #[cfg(target_arch = "x86_64")]
         fn query_hardware_vendor() -> CpuidVendor {
-            let res = unsafe { core::arch::x86_64::__cpuid(0) };
+            let res = core::arch::x86_64::__cpuid(0);
             propolis_types::CpuidValues::from(res)
                 .try_into()
                 .expect("CPU vendor is recognized")
diff --git a/lib/propolis/src/vsock/poller.rs b/lib/propolis/src/vsock/poller.rs
index 5f4302c0f..7d2b9d918 100644
--- a/lib/propolis/src/vsock/poller.rs
+++ b/lib/propolis/src/vsock/poller.rs
@@ -1064,29 +1064,6 @@ impl VsockGuestAddr {
     }
 }
 
-// TODO this can become `[VecDeque::pop_front_if]` when we update to Rust 1.93,
-// until then the impl is shamelessly borrowed.
-trait VecDequeExt<T> {
-    fn pop_front_if(
-        &mut self,
-        predicate: impl FnOnce(&mut T) -> bool,
-    ) -> Option<T>;
-}
-
-impl<T> VecDequeExt<T> for VecDeque<T> {
-    fn pop_front_if(
-        &mut self,
-        predicate: impl FnOnce(&mut T) -> bool,
-    ) -> Option<T> {
-        let first = self.front_mut()?;
-        if predicate(first) {
-            self.pop_front()
-        } else {
-            None
-        }
-    }
-}
-
 #[cfg(test)]
 mod test {
     use std::io::{Read, Write};
@@ -1495,9 +1472,8 @@ mod test {
         let num_chunks = (CONN_TX_BUF_SIZE / 2) / chunk_size + 1;
         let payload = vec![0xAB_u8; chunk_size];
         let total_sent = num_chunks * chunk_size;
-        let mut tx_consumed = 1u16; // REQUEST was consumed
 
-        for _ in 0..num_chunks {
+        for tx_consumed in (1u16..).take(num_chunks) {
             // Reuse descriptor slots each iteration
             harness.reset_tx_cursors();
 
@@ -1519,7 +1495,6 @@ mod test {
             harness.publish_tx(d_hdr);
             notify.queue_notify(VSOCK_TX_QUEUE).unwrap();
 
-            tx_consumed += 1;
             wait_for_condition(|| harness.tx_used_idx() >= tx_consumed, 5000);
         }
 
diff --git a/phd-tests/framework/src/disk/crucible.rs b/phd-tests/framework/src/disk/crucible.rs
index 843f0d9b5..2c5cf4cc2 100644
--- a/phd-tests/framework/src/disk/crucible.rs
+++ b/phd-tests/framework/src/disk/crucible.rs
@@ -323,7 +323,7 @@ impl Inner {
         // Spawn the downstairs processes that will serve requests from guest
         // VMs.
         let mut downstairs_instances = vec![];
-        for (port, dir) in downstairs_ports.iter().zip(data_dirs.into_iter()) {
+        for (port, dir) in downstairs_ports.iter().zip(data_dirs) {
             let addr = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), *port);
             let dir_arg = dir.path.to_string_lossy();
             let crucible_args = [
diff --git a/phd-tests/framework/src/lib.rs b/phd-tests/framework/src/lib.rs
index 69257f810..7c12af978 100644
--- a/phd-tests/framework/src/lib.rs
+++ b/phd-tests/framework/src/lib.rs
@@ -273,7 +273,7 @@ impl Framework {
             .with_context(|| {
                 format!(
                     "adding Propolis server '{}' from options",
-                    &params.propolis_server_path
+                    params.propolis_server_path
                 )
             })?;
 
diff --git a/phd-tests/framework/src/test_vm/mod.rs b/phd-tests/framework/src/test_vm/mod.rs
index 3f580e6da..6514d46c7 100644
--- a/phd-tests/framework/src/test_vm/mod.rs
+++ b/phd-tests/framework/src/test_vm/mod.rs
@@ -87,11 +87,13 @@ struct MigrationInfo {
 }
 
 /// Specifies the timeout to apply to an attempt to migrate.
+#[derive(Default)]
 pub enum MigrationTimeout {
     /// Time out after the specified duration.
     Explicit(std::time::Duration),
 
     /// Allow MIGRATION_SECS_PER_GUEST_GIB seconds per GiB of guest memory.
+    #[default]
     InferFromMemorySize,
 }
 
@@ -99,12 +101,6 @@ pub enum MigrationTimeout {
 /// the migrating VM.
 const MIGRATION_SECS_PER_GUEST_GIB: u64 = 90;
 
-impl Default for MigrationTimeout {
-    fn default() -> Self {
-        Self::InferFromMemorySize
-    }
-}
-
 impl From<std::time::Duration> for MigrationTimeout {
     fn from(value: std::time::Duration) -> Self {
         Self::Explicit(value)
diff --git a/phd-tests/tests/src/boot_order/efi_utils.rs b/phd-tests/tests/src/boot_order/efi_utils.rs
index 9c88a02fe..880bd6fb7 100644
--- a/phd-tests/tests/src/boot_order/efi_utils.rs
+++ b/phd-tests/tests/src/boot_order/efi_utils.rs
@@ -198,7 +198,7 @@ impl DevicePath {
             }
             (ty, subtype) => {
                 bail!(
-                    "Device path type/subtype unsupported: ({ty:#02x}/{subtype:#02x})"
+                    "Device path type/subtype unsupported: ({ty:#x}/{subtype:#x})"
                 );
             }
         }
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 43010dda7..18ea51900 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -2,5 +2,5 @@
 # We choose a specific toolchain (rather than "stable") for repeatability.  The
 # intent is to keep this up-to-date with recently-released stable Rust.
 
-channel = "1.90.0"
+channel = "1.97.1"
 profile = "default"