diff --git a/example-service/Cargo.toml b/example-service/Cargo.toml
index 2d63f443d..ca00ff611 100644
--- a/example-service/Cargo.toml
+++ b/example-service/Cargo.toml
@@ -15,19 +15,19 @@ description = "An example server built on tarpc."
 
 [dependencies]
 anyhow = "1.0"
-clap = { version = "4.5", features = ["derive"] }
+clap = { version = "4.6", features = ["derive"] }
 log = "0.4"
 futures = "0.3"
-opentelemetry = { version = "0.31" }
-opentelemetry-otlp = { version = "0.31", features = ["grpc-tonic"] }
-rand = "0.9"
+opentelemetry = { version = "0.32" }
+opentelemetry-otlp = { version = "0.32", features = ["grpc-tonic"] }
+rand = "0.10"
 tarpc = { version = "0.37", path = "../tarpc", features = ["full"] }
 tokio = { version = "1", features = ["macros", "net", "rt-multi-thread"] }
 tracing = { version = "0.1" }
-tracing-opentelemetry = "0.32"
+tracing-opentelemetry = "0.33"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
-opentelemetry_sdk = { version = "0.31", features = ["rt-tokio"] }
-opentelemetry-semantic-conventions = "0.31"
+opentelemetry_sdk = { version = "0.32", features = ["rt-tokio"] }
+opentelemetry-semantic-conventions = "0.32"
 
 [lib]
 name = "service"
diff --git a/plugins/Cargo.toml b/plugins/Cargo.toml
index 9d0853433..c202f01e1 100644
--- a/plugins/Cargo.toml
+++ b/plugins/Cargo.toml
@@ -22,7 +22,7 @@ travis-ci = { repository = "google/tarpc" }
 [dependencies]
 proc-macro2 = "1.0"
 quote = "1.0"
-syn = { version = "2.0", features = ["full", "extra-traits"] }
+syn = { version = "3.0", features = ["full", "extra-traits"] }
 
 [lib]
 proc-macro = true
diff --git a/tarpc/Cargo.toml b/tarpc/Cargo.toml
index 9be517e7e..c79af73fe 100644
--- a/tarpc/Cargo.toml
+++ b/tarpc/Cargo.toml
@@ -43,9 +43,9 @@ travis-ci = { repository = "google/tarpc" }
 [dependencies]
 fnv = "1.0"
 futures = "0.3"
-humantime = "2.3"
+humantime = "2.4"
 pin-project = "1.1"
-rand = "0.9"
+rand = "0.10"
 serde = { optional = true, version = "1.0", features = ["derive"] }
 static_assertions = "1.1"
 tarpc-plugins = { path = "../plugins", version = "0.14" }
@@ -57,9 +57,9 @@ tracing = { version = "0.1", default-features = false, features = [
     "attributes",
     "log",
 ] }
-tracing-opentelemetry = { version = "0.32", default-features = false }
-opentelemetry = { version = "0.31", default-features = false }
-opentelemetry-semantic-conventions = "0.31"
+tracing-opentelemetry = { version = "0.33", default-features = false }
+opentelemetry = { version = "0.32", default-features = false }
+opentelemetry-semantic-conventions = "0.32"
 
 [dev-dependencies]
 anyhow = "1.0"
@@ -68,9 +68,9 @@ bincode = { version = "2.0", features = ["serde"] }
 bytes = { version = "1", features = ["serde"] }
 flate2 = "1.1"
 futures-test = "0.3"
-opentelemetry = { version = "0.31", default-features = false }
-opentelemetry-otlp = { version = "0.31", features = ["grpc-tonic"] }
-opentelemetry_sdk = { version = "0.31", features = ["rt-tokio"] }
+opentelemetry = { version = "0.32", default-features = false }
+opentelemetry-otlp = { version = "0.32", features = ["grpc-tonic"] }
+opentelemetry_sdk = { version = "0.32", features = ["rt-tokio"] }
 pin-utils = "0.1"
 serde_bytes = "0.11"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
diff --git a/tarpc/src/trace.rs b/tarpc/src/trace.rs
index 6d27c99e2..d78f960af 100644
--- a/tarpc/src/trace.rs
+++ b/tarpc/src/trace.rs
@@ -17,7 +17,7 @@
 //! tracing](https://opencensus.io/core-concepts/tracing/).
 
 use opentelemetry::trace::TraceContextExt;
-use rand::Rng;
+use rand::{Rng, RngExt};
 use std::{
     convert::TryFrom,
     fmt::{self, Formatter},
diff --git a/tarpc/tests/compile_fail/no_serde1/no_explicit_serde_without_feature.stderr b/tarpc/tests/compile_fail/no_serde1/no_explicit_serde_without_feature.stderr
index 27744b374..e97af1fb0 100644
--- a/tarpc/tests/compile_fail/no_serde1/no_explicit_serde_without_feature.stderr
+++ b/tarpc/tests/compile_fail/no_serde1/no_explicit_serde_without_feature.stderr
@@ -3,9 +3,3 @@ error: To enable serde, first enable the `serde1` feature of tarpc
   |
 1 | #[tarpc::service(derive_serde = true)]
   |                  ^^^^^^^^^^^^
-
-error[E0433]: failed to resolve: use of undeclared type `FooRequest`
- --> tests/compile_fail/no_serde1/no_explicit_serde_without_feature.rs:7:13
-  |
-7 |     let x = FooRequest::Foo {};
-  |             ^^^^^^^^^^ use of undeclared type `FooRequest`