diff --git a/Cargo.lock b/Cargo.lock
index 2ff1cd0..55c3cfe 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1142,9 +1142,9 @@ dependencies = [
 
 [[package]]
 name = "h2"
-version = "0.4.14"
+version = "0.4.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "171fefbc92fe4a4de27e0698d6a5b392d6a0e333506bc49133760b3bcf948733"
+checksum = "6cb093c84e8bd9b188d4c4a8cb6579fc016968d14c99882163cd3ff402a4f155"
 dependencies = [
  "atomic-waker",
  "bytes",
@@ -1529,9 +1529,9 @@ dependencies = [
 
 [[package]]
 name = "igd-next"
-version = "0.17.0"
+version = "0.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bac9a3c8278f43b4cd8463380f4a25653ac843e5b177e1d3eaf849cc9ba10d4d"
+checksum = "de7238d487a9aff61f81b5ab41c0a841532a115a398b5fa92a2fadd0885e2581"
 dependencies = [
  "attohttpc",
  "bytes",
@@ -1814,6 +1814,7 @@ dependencies = [
  "opentelemetry",
  "opentelemetry-otlp",
  "opentelemetry_sdk",
+ "portable-atomic",
  "postcard",
  "rand 0.9.4",
  "serde",
diff --git a/Cargo.toml b/Cargo.toml
index 08934b5..a8d4918 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -120,7 +120,7 @@ tracing = { version = "0.1.41", default-features = false }
 n0-future = { version = "0.3", default-features = false }
 n0-error = { version = "1" }
 tracing-subscriber = { version = "0.3.23" }
-iroh = { version = "1" }
-iroh-base = { version = "1" }
+iroh = { version = "1", default-features = false }
+iroh-base = { version = "1", default-features = false }
 noq = { version = "1", default-features = false }
 futures-util = { version = "0.3", features = ["sink"] }
diff --git a/irpc-iroh/Cargo.toml b/irpc-iroh/Cargo.toml
index 10dd914..c1dc8f9 100644
--- a/irpc-iroh/Cargo.toml
+++ b/irpc-iroh/Cargo.toml
@@ -20,13 +20,16 @@ serde = { workspace = true }
 postcard = { workspace = true, features = ["alloc", "use-std"] }
 n0-error = { workspace = true }
 n0-future = { workspace = true }
-irpc = { version = "0.17.0", path = ".." }
+portable-atomic = "1"
+irpc = { version = "0.17.0", path = "..", default-features = false, features = ["rpc", "spans", "stream", "derive"] }
 iroh-base.workspace = true
 
 [target.'cfg(all(target_family = "wasm", target_os = "unknown"))'.dependencies]
 getrandom = { version = "0.3", features = ["wasm_js"] }
 
 [dev-dependencies]
+# Tests and examples need a crypto provider, which iroh's default features supply.
+iroh = { workspace = true, default-features = true }
 n0-future = { workspace = true }
 tracing-subscriber = { workspace = true, features = ["fmt"] }
 irpc-derive = { version = "0.17.0", path = "../irpc-derive" }
diff --git a/irpc-iroh/src/lib.rs b/irpc-iroh/src/lib.rs
index 7307ab2..41d4520 100644
--- a/irpc-iroh/src/lib.rs
+++ b/irpc-iroh/src/lib.rs
@@ -1,9 +1,4 @@
-use std::{
-    fmt,
-    future::Future,
-    io,
-    sync::{Arc, atomic::AtomicU64},
-};
+use std::{fmt, future::Future, io, sync::Arc};
 
 use iroh::{
     EndpointId,
@@ -25,6 +20,9 @@ use irpc::{
 };
 use n0_error::{Result, e};
 use n0_future::{TryFutureExt, future::Boxed as BoxFuture};
+// portable-atomic provides AtomicU64 on 32-bit targets (e.g. Xtensa ESP32) that
+// lack native 64-bit atomics, same as iroh itself.
+use portable_atomic::{AtomicU64, Ordering};
 use tracing::{Instrument, debug, error_span, trace, trace_span, warn};
 
 /// Returns a client that connects to a irpc service using an [`iroh::Endpoint`].
@@ -219,9 +217,7 @@ impl<S: Service> IrohProtocol<S> {
 impl<S: Service> ProtocolHandler for IrohProtocol<S> {
     async fn accept(&self, connection: Connection) -> Result<(), AcceptError> {
         let handler = self.handler.clone();
-        let request_id = self
-            .request_id
-            .fetch_add(1, std::sync::atomic::Ordering::AcqRel);
+        let request_id = self.request_id.fetch_add(1, Ordering::AcqRel);
         let fut = handle_connection::<S>(&connection, handler).map_err(AcceptError::from_err);
         let span = trace_span!("rpc", id = request_id);
         fut.instrument(span).await
@@ -267,9 +263,7 @@ impl<S: Service> ProtocolHandler for Iroh0RttProtocol<S> {
     async fn on_accepting(&self, accepting: Accepting) -> Result<Connection, AcceptError> {
         let zrtt_conn = accepting.into_0rtt();
         let handler = self.handler.clone();
-        let request_id = self
-            .request_id
-            .fetch_add(1, std::sync::atomic::Ordering::AcqRel);
+        let request_id = self.request_id.fetch_add(1, Ordering::AcqRel);
         handle_connection::<S>(&zrtt_conn, handler)
             .map_err(AcceptError::from_err)
             .instrument(trace_span!("rpc", id = request_id))