diff --git a/rust-toolchain b/rust-toolchain
index a50908ca3da..3987c472943 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-1.42.0
+1.43.1
diff --git a/src/rust/engine/Cargo.lock b/src/rust/engine/Cargo.lock
index 1dfc83a60e3..45ac195dbf9 100644
--- a/src/rust/engine/Cargo.lock
+++ b/src/rust/engine/Cargo.lock
@@ -115,7 +115,7 @@ dependencies = [
  "copy_dir 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "dir-diff 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
- "grpcio 0.5.1 (git+https://github.com/pantsbuild/grpc-rs.git?rev=d16fcfb4afbdd4c791e7c7e64e9748319ed8ad70)",
+ "grpcio 0.5.1 (git+https://github.com/pantsbuild/grpc-rs.git?rev=ed3afa3c24ddf1fdd86826e836f57c00757dfc00)",
  "grpcio-compiler 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "hashing 0.0.1",
  "prost 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -724,17 +724,7 @@ dependencies = [
 
 [[package]]
 name = "derivative"
-version = "1.0.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.44 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "derivative"
-version = "2.0.2"
+version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 1.0.12 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1279,10 +1269,10 @@ dependencies = [
 [[package]]
 name = "grpcio"
 version = "0.5.1"
-source = "git+https://github.com/pantsbuild/grpc-rs.git?rev=d16fcfb4afbdd4c791e7c7e64e9748319ed8ad70#d16fcfb4afbdd4c791e7c7e64e9748319ed8ad70"
+source = "git+https://github.com/pantsbuild/grpc-rs.git?rev=ed3afa3c24ddf1fdd86826e836f57c00757dfc00#ed3afa3c24ddf1fdd86826e836f57c00757dfc00"
 dependencies = [
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
- "grpcio-sys 0.5.1 (git+https://github.com/pantsbuild/grpc-rs.git?rev=d16fcfb4afbdd4c791e7c7e64e9748319ed8ad70)",
+ "grpcio-sys 0.5.1 (git+https://github.com/pantsbuild/grpc-rs.git?rev=ed3afa3c24ddf1fdd86826e836f57c00757dfc00)",
  "libc 0.2.69 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "protobuf 2.0.6 (git+https://github.com/pantsbuild/rust-protobuf?rev=171611c33ec92f07e1b7107327f6d0139a7afebf)",
@@ -1300,7 +1290,7 @@ dependencies = [
 [[package]]
 name = "grpcio-sys"
 version = "0.5.1"
-source = "git+https://github.com/pantsbuild/grpc-rs.git?rev=d16fcfb4afbdd4c791e7c7e64e9748319ed8ad70#d16fcfb4afbdd4c791e7c7e64e9748319ed8ad70"
+source = "git+https://github.com/pantsbuild/grpc-rs.git?rev=ed3afa3c24ddf1fdd86826e836f57c00757dfc00#ed3afa3c24ddf1fdd86826e836f57c00757dfc00"
 dependencies = [
  "bindgen 0.53.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "cc 1.0.50 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1901,7 +1891,7 @@ dependencies = [
  "bazel_protos 0.0.1",
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
- "grpcio 0.5.1 (git+https://github.com/pantsbuild/grpc-rs.git?rev=d16fcfb4afbdd4c791e7c7e64e9748319ed8ad70)",
+ "grpcio 0.5.1 (git+https://github.com/pantsbuild/grpc-rs.git?rev=ed3afa3c24ddf1fdd86826e836f57c00757dfc00)",
  "hashing 0.0.1",
  "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "protobuf 2.0.6 (git+https://github.com/pantsbuild/rust-protobuf?rev=171611c33ec92f07e1b7107327f6d0139a7afebf)",
@@ -2063,7 +2053,7 @@ name = "num_enum"
 version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "derivative 2.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "derivative 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_enum_derive 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2328,12 +2318,12 @@ dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "concrete_time 0.0.1",
  "copy_dir 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "derivative 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "derivative 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "digest 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "fs 0.0.1",
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "grpcio 0.5.1 (git+https://github.com/pantsbuild/grpc-rs.git?rev=d16fcfb4afbdd4c791e7c7e64e9748319ed8ad70)",
+ "grpcio 0.5.1 (git+https://github.com/pantsbuild/grpc-rs.git?rev=ed3afa3c24ddf1fdd86826e836f57c00757dfc00)",
  "hashing 0.0.1",
  "itertools 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3116,7 +3106,7 @@ dependencies = [
  "fs 0.0.1",
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "grpcio 0.5.1 (git+https://github.com/pantsbuild/grpc-rs.git?rev=d16fcfb4afbdd4c791e7c7e64e9748319ed8ad70)",
+ "grpcio 0.5.1 (git+https://github.com/pantsbuild/grpc-rs.git?rev=ed3afa3c24ddf1fdd86826e836f57c00757dfc00)",
  "hashing 0.0.1",
  "indexmap 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "itertools 0.7.11 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3966,8 +3956,7 @@ dependencies = [
 "checksum ct-logs 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "4d3686f5fa27dbc1d76c751300376e167c5a43387f44bb451fd1c24776e49113"
 "checksum curl 0.4.28 (registry+https://github.com/rust-lang/crates.io-index)" = "eda1c0c03cacf3365d84818a40293f0e3f3953db8759c9c565a3b434edf0b52e"
 "checksum curl-sys 0.4.30+curl-7.69.1 (registry+https://github.com/rust-lang/crates.io-index)" = "923b38e423a8f47a4058e96f2a1fa2865a6231097ee860debd678d244277d50c"
-"checksum derivative 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "3c6d883546668a3e2011b6a716a7330b82eabb0151b138217f632c8243e17135"
-"checksum derivative 2.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1b94d2eb97732ec84b4e25eaf37db890e317b80e921f168c82cb5282473f8151"
+"checksum derivative 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cb582b60359da160a9477ee80f15c8d784c477e69c217ef2cdd4169c24ea380f"
 "checksum digest 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f3d0c8c8752312f9713efd397ff63acb9f85585afbf179282e720e7704954dd5"
 "checksum dir-diff 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "2860407d7d7e2e004bb2128510ad9e8d669e76fa005ccf567977b5d71b8b4a0b"
 "checksum dirs 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "3fd78930633bd1c6e35c4b42b1df7b0cbc6bc191146e512bb3bedf243fcc3901"
@@ -4016,9 +4005,9 @@ dependencies = [
 "checksum glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "8be18de09a56b60ed0edf84bc9df007e30040691af7acd1c41874faac5895bfb"
 "checksum glob 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9b919933a397b79c37e33b77bb2aa3dc8eb6e165ad809e58ff75bc7db2e34574"
 "checksum globset 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)" = "7ad1da430bd7281dde2576f44c84cc3f0f7b475e7202cd503042dff01a8c8120"
-"checksum grpcio 0.5.1 (git+https://github.com/pantsbuild/grpc-rs.git?rev=d16fcfb4afbdd4c791e7c7e64e9748319ed8ad70)" = "<none>"
+"checksum grpcio 0.5.1 (git+https://github.com/pantsbuild/grpc-rs.git?rev=ed3afa3c24ddf1fdd86826e836f57c00757dfc00)" = "<none>"
 "checksum grpcio-compiler 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a63ccc27b0099347d2bea2c3d0f1c79c018a13cfd08b814a1992e341b645d5e1"
-"checksum grpcio-sys 0.5.1 (git+https://github.com/pantsbuild/grpc-rs.git?rev=d16fcfb4afbdd4c791e7c7e64e9748319ed8ad70)" = "<none>"
+"checksum grpcio-sys 0.5.1 (git+https://github.com/pantsbuild/grpc-rs.git?rev=ed3afa3c24ddf1fdd86826e836f57c00757dfc00)" = "<none>"
 "checksum h2 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)" = "a5b34c246847f938a410a03c5458c7fee2274436675e76d8b903c08efc29c462"
 "checksum h2 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9d5c295d1c0c68e4e42003d75f908f5e16a1edd1cbe0b0d02e4dc2006a384f47"
 "checksum heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "20564e78d53d2bb135c343b3f47714a56af2061f1c928fdb541dc7b9fdd94205"
diff --git a/src/rust/engine/engine_cffi/build.rs b/src/rust/engine/engine_cffi/build.rs
index 06cfec8d18b..274b59c4db5 100644
--- a/src/rust/engine/engine_cffi/build.rs
+++ b/src/rust/engine/engine_cffi/build.rs
@@ -25,9 +25,6 @@
 // Arc<Mutex> can be more clear than needing to grok Orderings:
 #![allow(clippy::mutex_atomic)]
 
-use cbindgen;
-use cc;
-
 /*
 We use the `gcc` crate to compile the CFFI C sources (`native_engine.c`)
 generated by `bootstrap.sh` into a (private) static lib (`libnative_engine_ffi.a`),
diff --git a/src/rust/engine/engine_cffi/src/lib.rs b/src/rust/engine/engine_cffi/src/lib.rs
index 727a524e347..431fc5fbad4 100644
--- a/src/rust/engine/engine_cffi/src/lib.rs
+++ b/src/rust/engine/engine_cffi/src/lib.rs
@@ -65,7 +65,6 @@ use std::panic;
 use std::path::{Path, PathBuf};
 use std::time::Duration;
 use tempfile::TempDir;
-use tokio;
 use workunit_store::{Workunit, WorkunitState};
 
 #[cfg(test)]
diff --git a/src/rust/engine/fs/brfs/src/main.rs b/src/rust/engine/fs/brfs/src/main.rs
index 99fe7668a78..f94e37c11cc 100644
--- a/src/rust/engine/fs/brfs/src/main.rs
+++ b/src/rust/engine/fs/brfs/src/main.rs
@@ -25,19 +25,6 @@
 // Arc<Mutex> can be more clear than needing to grok Orderings:
 #![allow(clippy::mutex_atomic)]
 
-use bazel_protos;
-use clap;
-use dirs;
-
-use env_logger;
-use fuse;
-
-use libc;
-
-use serverset;
-
-use time;
-
 use futures::future::FutureExt;
 use hashing::{Digest, Fingerprint};
 use log::{debug, error, warn};
diff --git a/src/rust/engine/fs/fs_util/src/main.rs b/src/rust/engine/fs/fs_util/src/main.rs
index 7a480007128..b2116a65f44 100644
--- a/src/rust/engine/fs/fs_util/src/main.rs
+++ b/src/rust/engine/fs/fs_util/src/main.rs
@@ -25,14 +25,6 @@
 // Arc<Mutex> can be more clear than needing to grok Orderings:
 #![allow(clippy::mutex_atomic)]
 
-use clap;
-use env_logger;
-use fs;
-
-use rand;
-
-use serde_json;
-
 use boxfuture::{BoxFuture, Boxable};
 use bytes::Bytes;
 use clap::{value_t, App, Arg, SubCommand};
diff --git a/src/rust/engine/fs/store/Cargo.toml b/src/rust/engine/fs/store/Cargo.toml
index 45dd4f13b3b..875edd7eff5 100644
--- a/src/rust/engine/fs/store/Cargo.toml
+++ b/src/rust/engine/fs/store/Cargo.toml
@@ -14,8 +14,8 @@ dirs = "1"
 fs = { path = ".." }
 futures01 = { package = "futures", version = "0.1" }
 futures = { version = "0.3", features = ["compat"] }
-# TODO: This is 0.5.1 + https://github.com/tikv/grpc-rs/pull/457.
-grpcio = { git = "https://github.com/pantsbuild/grpc-rs.git", rev = "d16fcfb4afbdd4c791e7c7e64e9748319ed8ad70", default_features = false, features = ["protobuf-codec", "secure"] }
+# TODO: This is 0.5.1 + https://github.com/tikv/grpc-rs/pull/457 + a workaround for https://github.com/rust-lang/cargo/issues/8258
+grpcio = { git = "https://github.com/pantsbuild/grpc-rs.git", rev = "ed3afa3c24ddf1fdd86826e836f57c00757dfc00", default_features = false, features = ["protobuf-codec", "secure"] }
 hashing = { path = "../../hashing" }
 indexmap = "1.0.2"
 itertools = "0.7.2"
diff --git a/src/rust/engine/fs/store/src/lib.rs b/src/rust/engine/fs/store/src/lib.rs
index 0534a498197..0dd98626a95 100644
--- a/src/rust/engine/fs/store/src/lib.rs
+++ b/src/rust/engine/fs/store/src/lib.rs
@@ -34,11 +34,9 @@ pub use crate::snapshot::{OneOffStoreFileByDigest, Snapshot, StoreFileByDigest};
 #[cfg(test)]
 mod snapshot_tests;
 
-use bazel_protos;
 use boxfuture::{try_future, BoxFuture, Boxable};
 use bytes::Bytes;
 use concrete_time::TimeSpan;
-use dirs;
 use fs::FileContent;
 use futures::compat::Future01CompatExt;
 use futures::future::{FutureExt, TryFutureExt};
diff --git a/src/rust/engine/fs/store/src/local.rs b/src/rust/engine/fs/store/src/local.rs
index b5e8c234a19..7a7b2edafae 100644
--- a/src/rust/engine/fs/store/src/local.rs
+++ b/src/rust/engine/fs/store/src/local.rs
@@ -7,7 +7,6 @@ use lmdb::Error::NotFound;
 use lmdb::{self, Cursor, Database, RwTransaction, Transaction, WriteFlags};
 use sha2::Sha256;
 use sharded_lmdb::{ShardedLmdb, VersionedFingerprint};
-use std;
 use std::collections::BinaryHeap;
 use std::path::Path;
 use std::sync::Arc;
diff --git a/src/rust/engine/fs/store/src/remote.rs b/src/rust/engine/fs/store/src/remote.rs
index 6e499bd6113..212cc05bcb9 100644
--- a/src/rust/engine/fs/store/src/remote.rs
+++ b/src/rust/engine/fs/store/src/remote.rs
@@ -7,7 +7,6 @@ use digest::{Digest as DigestTrait, FixedOutput};
 use futures::compat::Future01CompatExt;
 use futures::future::{FutureExt, TryFutureExt};
 use futures01::{future, Future, Sink, Stream};
-use grpcio;
 use hashing::{Digest, Fingerprint};
 use serverset::{retry, Serverset};
 use sha2::Sha256;
@@ -15,7 +14,6 @@ use std::cmp::min;
 use std::collections::{BTreeMap, HashSet};
 use std::sync::Arc;
 use std::time::Duration;
-use uuid;
 
 #[derive(Clone)]
 pub struct ByteStore {
diff --git a/src/rust/engine/fs/store/src/snapshot.rs b/src/rust/engine/fs/store/src/snapshot.rs
index e0546229d95..1fc04fa63d4 100644
--- a/src/rust/engine/fs/store/src/snapshot.rs
+++ b/src/rust/engine/fs/store/src/snapshot.rs
@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 use crate::Store;
-use bazel_protos;
 use boxfuture::{BoxFuture, Boxable};
 use bytes::Bytes;
 use fs::{
@@ -15,8 +14,6 @@ use futures01::future;
 use hashing::{Digest, EMPTY_DIGEST};
 use indexmap::{self, IndexMap};
 use itertools::Itertools;
-use log;
-use protobuf;
 use std::collections::{HashMap, HashSet};
 use std::ffi::OsString;
 use std::fmt;
diff --git a/src/rust/engine/graph/src/lib.rs b/src/rust/engine/graph/src/lib.rs
index 53af9373f51..938c826cc69 100644
--- a/src/rust/engine/graph/src/lib.rs
+++ b/src/rust/engine/graph/src/lib.rs
@@ -25,10 +25,6 @@
 // Arc<Mutex> can be more clear than needing to grok Orderings:
 #![allow(clippy::mutex_atomic)]
 
-use hashing;
-
-use petgraph;
-
 // make the entry module public for testing purposes. We use it to construct mock
 // graph entries in the notify watch tests.
 pub mod entry;
diff --git a/src/rust/engine/hashing/src/lib.rs b/src/rust/engine/hashing/src/lib.rs
index dcebe3dadb2..293a6c7c205 100644
--- a/src/rust/engine/hashing/src/lib.rs
+++ b/src/rust/engine/hashing/src/lib.rs
@@ -25,8 +25,6 @@
 // Arc<Mutex> can be more clear than needing to grok Orderings:
 #![allow(clippy::mutex_atomic)]
 
-use hex;
-
 use digest::{Digest as DigestTrait, FixedOutput};
 use serde::ser::{Serialize, SerializeStruct, Serializer};
 use serde::{Deserialize, Deserializer};
diff --git a/src/rust/engine/logging/src/logger.rs b/src/rust/engine/logging/src/logger.rs
index 5546b540006..3b98b3b9364 100644
--- a/src/rust/engine/logging/src/logger.rs
+++ b/src/rust/engine/logging/src/logger.rs
@@ -13,7 +13,6 @@ use std::io::{stderr, Stderr, Write};
 use std::path::PathBuf;
 use std::sync::atomic::{AtomicBool, Ordering};
 
-use chrono;
 use lazy_static::lazy_static;
 use log::{debug, log, set_logger, set_max_level, LevelFilter, Log, Metadata, Record};
 use parking_lot::Mutex;
diff --git a/src/rust/engine/nailgun/src/lib.rs b/src/rust/engine/nailgun/src/lib.rs
index 6daadd84c79..6d86e57e8a2 100644
--- a/src/rust/engine/nailgun/src/lib.rs
+++ b/src/rust/engine/nailgun/src/lib.rs
@@ -44,7 +44,6 @@ use log::{debug, error, info};
 pub use nails::execution::ExitCode;
 use nails::execution::{self, send_to_io, sink_for, stream_for, ChildInput, ChildOutput};
 use nails::Nail;
-use os_pipe;
 use tokio::fs::File;
 use tokio::net::TcpListener;
 use tokio::sync::watch;
diff --git a/src/rust/engine/process_execution/Cargo.toml b/src/rust/engine/process_execution/Cargo.toml
index 19c3adc4f03..4f25ac0491c 100644
--- a/src/rust/engine/process_execution/Cargo.toml
+++ b/src/rust/engine/process_execution/Cargo.toml
@@ -13,13 +13,13 @@ async_semaphore = { path = "../async_semaphore" }
 bazel_protos = { path = "bazel_protos" }
 boxfuture = { path = "../boxfuture" }
 bytes = "0.4.5"
-derivative = "1.0.2"
+derivative = "2.1.1"
 digest = "0.8"
 fs = { path = "../fs" }
 futures01 = { package = "futures", version = "0.1" }
 futures = { version = "0.3", features = ["compat"] }
-# TODO: This is 0.5.1 + https://github.com/tikv/grpc-rs/pull/457.
-grpcio = { git = "https://github.com/pantsbuild/grpc-rs.git", rev = "d16fcfb4afbdd4c791e7c7e64e9748319ed8ad70", default_features = false, features = ["protobuf-codec", "secure"] }
+# TODO: This is 0.5.1 + https://github.com/tikv/grpc-rs/pull/457 + a workaround for https://github.com/rust-lang/cargo/issues/8258
+grpcio = { git = "https://github.com/pantsbuild/grpc-rs.git", rev = "ed3afa3c24ddf1fdd86826e836f57c00757dfc00", default_features = false, features = ["protobuf-codec", "secure"] }
 hashing = { path = "../hashing" }
 libc = "0.2.39"
 log = "0.4"
diff --git a/src/rust/engine/process_execution/bazel_protos/Cargo.toml b/src/rust/engine/process_execution/bazel_protos/Cargo.toml
index d5c076921f7..abdf0458b71 100644
--- a/src/rust/engine/process_execution/bazel_protos/Cargo.toml
+++ b/src/rust/engine/process_execution/bazel_protos/Cargo.toml
@@ -8,8 +8,8 @@ publish = false
 [dependencies]
 bytes = "0.4.5"
 futures = "^0.1.16"
-# TODO: This is 0.5.1 + https://github.com/tikv/grpc-rs/pull/457.
-grpcio = { git = "https://github.com/pantsbuild/grpc-rs.git", rev = "d16fcfb4afbdd4c791e7c7e64e9748319ed8ad70", default_features = false, features = ["protobuf-codec", "secure"] }
+# TODO: This is 0.5.1 + https://github.com/tikv/grpc-rs/pull/457 + a workaround for https://github.com/rust-lang/cargo/issues/8258
+grpcio = { git = "https://github.com/pantsbuild/grpc-rs.git", rev = "ed3afa3c24ddf1fdd86826e836f57c00757dfc00", default_features = false, features = ["protobuf-codec", "secure"] }
 hashing = { path = "../../hashing" }
 prost = "0.4"
 prost-derive = "0.4"
diff --git a/src/rust/engine/process_execution/bazel_protos/build.rs b/src/rust/engine/process_execution/bazel_protos/build.rs
index a274eb47e3d..9072a032522 100644
--- a/src/rust/engine/process_execution/bazel_protos/build.rs
+++ b/src/rust/engine/process_execution/bazel_protos/build.rs
@@ -1,8 +1,6 @@
 // Copyright 2018 Pants project contributors (see CONTRIBUTORS.md).
 // Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-use protoc_grpcio;
-
 use std::path::{Path, PathBuf};
 
 use build_utils::BuildRoot;
diff --git a/src/rust/engine/process_execution/bazel_protos/src/conversions.rs b/src/rust/engine/process_execution/bazel_protos/src/conversions.rs
index 677363dd9e3..f556e2b64f7 100644
--- a/src/rust/engine/process_execution/bazel_protos/src/conversions.rs
+++ b/src/rust/engine/process_execution/bazel_protos/src/conversions.rs
@@ -1,5 +1,3 @@
-use hashing;
-
 impl<'a> From<&'a hashing::Digest> for crate::remote_execution::Digest {
   fn from(d: &hashing::Digest) -> Self {
     let mut digest = super::remote_execution::Digest::new();
diff --git a/src/rust/engine/process_execution/bazel_protos/src/verification.rs b/src/rust/engine/process_execution/bazel_protos/src/verification.rs
index 22f4ad35fd2..6adcec82ba4 100644
--- a/src/rust/engine/process_execution/bazel_protos/src/verification.rs
+++ b/src/rust/engine/process_execution/bazel_protos/src/verification.rs
@@ -1,5 +1,4 @@
 use crate::remote_execution;
-use protobuf;
 
 use std::collections::HashSet;
 
diff --git a/src/rust/engine/process_execution/src/cache.rs b/src/rust/engine/process_execution/src/cache.rs
index 1c5b6e3a959..bbc60f26745 100644
--- a/src/rust/engine/process_execution/src/cache.rs
+++ b/src/rust/engine/process_execution/src/cache.rs
@@ -5,7 +5,6 @@ use crate::{
 use std::sync::Arc;
 
 use async_trait::async_trait;
-use bincode;
 use bytes::Bytes;
 use futures::compat::Future01CompatExt;
 use futures::future;
diff --git a/src/rust/engine/process_execution/src/local.rs b/src/rust/engine/process_execution/src/local.rs
index 28bc5d8e6bb..65c055a7935 100644
--- a/src/rust/engine/process_execution/src/local.rs
+++ b/src/rust/engine/process_execution/src/local.rs
@@ -1,6 +1,3 @@
-use log;
-use tempfile;
-
 use async_trait::async_trait;
 use boxfuture::{try_future, BoxFuture, Boxable};
 use fs::{self, GlobExpansionConjunction, GlobMatching, PathGlobs, StrictGlobMatching};
diff --git a/src/rust/engine/process_execution/src/remote.rs b/src/rust/engine/process_execution/src/remote.rs
index 27318a2debe..9c3b4966e6c 100644
--- a/src/rust/engine/process_execution/src/remote.rs
+++ b/src/rust/engine/process_execution/src/remote.rs
@@ -15,9 +15,7 @@ use fs::{self, File, PathStat};
 use futures::compat::Future01CompatExt;
 use futures::future::{self as future03, TryFutureExt};
 use futures01::{future, Future, Stream};
-use grpcio;
 use hashing::{Digest, Fingerprint};
-use libc;
 use log::{debug, trace, warn};
 use protobuf::{self, Message, ProtobufEnum};
 use sha2::Sha256;
@@ -28,7 +26,6 @@ use crate::{
   Context, ExecutionStats, FallibleProcessResultWithPlatform, MultiPlatformProcess, Platform,
   PlatformConstraint, Process, ProcessMetadata,
 };
-use std;
 use std::cmp::min;
 use workunit_store::WorkunitStore;
 
diff --git a/src/rust/engine/process_executor/src/main.rs b/src/rust/engine/process_executor/src/main.rs
index 9fa4986c4b2..20034e37390 100644
--- a/src/rust/engine/process_executor/src/main.rs
+++ b/src/rust/engine/process_executor/src/main.rs
@@ -25,11 +25,6 @@
 // Arc<Mutex> can be more clear than needing to grok Orderings:
 #![allow(clippy::mutex_atomic)]
 
-use clap;
-use env_logger;
-
-use process_execution;
-
 use clap::{value_t, App, AppSettings, Arg};
 use futures::compat::Future01CompatExt;
 use hashing::{Digest, Fingerprint};
diff --git a/src/rust/engine/src/context.rs b/src/rust/engine/src/context.rs
index 89c68839f1d..a8b46b581b4 100644
--- a/src/rust/engine/src/context.rs
+++ b/src/rust/engine/src/context.rs
@@ -27,7 +27,6 @@ use process_execution::{
   ProcessMetadata,
 };
 use rand::seq::SliceRandom;
-use reqwest;
 use rule_graph::RuleGraph;
 use sharded_lmdb::ShardedLmdb;
 use store::Store;
diff --git a/src/rust/engine/src/core.rs b/src/rust/engine/src/core.rs
index f441734ec76..60a4260e56c 100644
--- a/src/rust/engine/src/core.rs
+++ b/src/rust/engine/src/core.rs
@@ -10,7 +10,6 @@ use std::{fmt, hash};
 use crate::externs;
 use crate::handles::Handle;
 
-use rule_graph;
 use smallvec::{smallvec, SmallVec};
 
 pub type FNV = hash::BuildHasherDefault<FnvHasher>;
diff --git a/src/rust/engine/src/intrinsics.rs b/src/rust/engine/src/intrinsics.rs
index e19ee678d40..7ebd57b16f3 100644
--- a/src/rust/engine/src/intrinsics.rs
+++ b/src/rust/engine/src/intrinsics.rs
@@ -7,10 +7,8 @@ use crate::tasks::Intrinsic;
 use crate::types::Types;
 
 use boxfuture::Boxable;
-use bytes;
 use futures::future::{self as future03, TryFutureExt};
 use futures01::{future, Future};
-use hashing;
 use indexmap::IndexMap;
 
 use std::path::PathBuf;
diff --git a/src/rust/engine/src/nodes.rs b/src/rust/engine/src/nodes.rs
index a6da92609e8..ffd4a8713de 100644
--- a/src/rust/engine/src/nodes.rs
+++ b/src/rust/engine/src/nodes.rs
@@ -28,11 +28,9 @@ use fs::{
   self, Dir, DirectoryListing, File, FileContent, GlobExpansionConjunction, GlobMatching, Link,
   PathGlobs, PathStat, PreparedPathGlobs, StrictGlobMatching, VFS,
 };
-use hashing;
 use process_execution::{
   self, MultiPlatformProcess, NamedCache, PlatformConstraint, Process, RelativePath,
 };
-use rule_graph;
 
 use graph::{Entry, Node, NodeError, NodeVisualizer};
 use store::{self, StoreFileByDigest};
diff --git a/src/rust/engine/src/scheduler.rs b/src/rust/engine/src/scheduler.rs
index c1546b4a979..082be2095f0 100644
--- a/src/rust/engine/src/scheduler.rs
+++ b/src/rust/engine/src/scheduler.rs
@@ -16,7 +16,6 @@ use crate::core::{Failure, Params, TypeId, Value};
 use crate::nodes::{NodeKey, Select, Visualizer};
 
 use graph::{InvalidationResult, LastObserved};
-use hashing;
 use log::{debug, info, warn};
 use parking_lot::Mutex;
 use task_executor::Executor;
diff --git a/src/rust/engine/src/selectors.rs b/src/rust/engine/src/selectors.rs
index a0fd71e0b74..692fe9e0dba 100644
--- a/src/rust/engine/src/selectors.rs
+++ b/src/rust/engine/src/selectors.rs
@@ -5,8 +5,6 @@ use std::fmt;
 
 use crate::core::TypeId;
 
-use rule_graph;
-
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
 pub struct Get {
   pub product: TypeId,
diff --git a/src/rust/engine/src/tasks.rs b/src/rust/engine/src/tasks.rs
index 6ddc05479f2..78961ee0a5a 100644
--- a/src/rust/engine/src/tasks.rs
+++ b/src/rust/engine/src/tasks.rs
@@ -8,8 +8,6 @@ use crate::core::{Function, TypeId};
 use crate::intrinsics::Intrinsics;
 use crate::selectors::{DependencyKey, Get, Select};
 
-use rule_graph;
-
 #[derive(Eq, Hash, PartialEq, Clone, Debug)]
 pub enum Rule {
   // Intrinsic rules are implemented in rust.
diff --git a/src/rust/engine/testutil/local_cas/src/main.rs b/src/rust/engine/testutil/local_cas/src/main.rs
index 27313412a47..0e13e1098b7 100644
--- a/src/rust/engine/testutil/local_cas/src/main.rs
+++ b/src/rust/engine/testutil/local_cas/src/main.rs
@@ -25,8 +25,6 @@
 // Arc<Mutex> can be more clear than needing to grok Orderings:
 #![allow(clippy::mutex_atomic)]
 
-use env_logger;
-
 use clap::{App, Arg};
 use mock::StubCAS;
 use std::io;
diff --git a/src/rust/engine/testutil/mock/Cargo.toml b/src/rust/engine/testutil/mock/Cargo.toml
index 2771be17e42..b888b9752ac 100644
--- a/src/rust/engine/testutil/mock/Cargo.toml
+++ b/src/rust/engine/testutil/mock/Cargo.toml
@@ -9,8 +9,8 @@ publish = false
 bazel_protos = { path = "../../process_execution/bazel_protos" }
 bytes = "0.4.5"
 futures01 = { package = "futures", version = "0.1" }
-# TODO: This is 0.5.1 + https://github.com/tikv/grpc-rs/pull/457.
-grpcio = { git = "https://github.com/pantsbuild/grpc-rs.git", rev = "d16fcfb4afbdd4c791e7c7e64e9748319ed8ad70", default_features = false, features = ["protobuf-codec", "secure"] }
+# TODO: This is 0.5.1 + https://github.com/tikv/grpc-rs/pull/457 + a workaround for https://github.com/rust-lang/cargo/issues/8258
+grpcio = { git = "https://github.com/pantsbuild/grpc-rs.git", rev = "ed3afa3c24ddf1fdd86826e836f57c00757dfc00", default_features = false, features = ["protobuf-codec", "secure"] }
 hashing = { path = "../../hashing" }
 parking_lot = "0.6"
 protobuf = { version = "2.0.6", features = ["with-bytes"] }
diff --git a/src/rust/engine/testutil/mock/src/cas.rs b/src/rust/engine/testutil/mock/src/cas.rs
index 09c090e8fa3..a16542be43f 100644
--- a/src/rust/engine/testutil/mock/src/cas.rs
+++ b/src/rust/engine/testutil/mock/src/cas.rs
@@ -1,9 +1,6 @@
 use std::collections::HashMap;
 use std::sync::Arc;
 
-use bazel_protos;
-use grpcio;
-
 use bytes::Bytes;
 use futures01::{Future, IntoFuture, Stream};
 use hashing::{Digest, Fingerprint};
diff --git a/src/rust/engine/testutil/mock/src/execution_server.rs b/src/rust/engine/testutil/mock/src/execution_server.rs
index 5352d5b9ec3..f59a459063a 100644
--- a/src/rust/engine/testutil/mock/src/execution_server.rs
+++ b/src/rust/engine/testutil/mock/src/execution_server.rs
@@ -7,11 +7,8 @@ use std::thread::sleep;
 use std::time::Duration;
 use std::time::Instant;
 
-use bazel_protos;
 use futures01::{Future, Sink};
-use grpcio;
 use parking_lot::Mutex;
-use protobuf;
 
 ///
 /// A MockOperation to be used with MockExecution.
diff --git a/src/rust/engine/testutil/src/data.rs b/src/rust/engine/testutil/src/data.rs
index 39a3ddd10b6..dfb5be6c977 100644
--- a/src/rust/engine/testutil/src/data.rs
+++ b/src/rust/engine/testutil/src/data.rs
@@ -1,7 +1,4 @@
-use bazel_protos;
-use bytes;
 use digest::FixedOutput;
-use hashing;
 use protobuf::Message;
 use sha2::{self, Digest};
 
diff --git a/src/rust/engine/testutil/src/file.rs b/src/rust/engine/testutil/src/file.rs
index 2604c8daebb..91ee686867a 100644
--- a/src/rust/engine/testutil/src/file.rs
+++ b/src/rust/engine/testutil/src/file.rs
@@ -1,5 +1,3 @@
-use bytes;
-use std;
 use std::io::Read;
 use std::os::unix::fs::PermissionsExt;
 use std::path::Path;
diff --git a/src/rust/engine/watch/src/lib.rs b/src/rust/engine/watch/src/lib.rs
index e4ae9b4141a..d43d1ef5180 100644
--- a/src/rust/engine/watch/src/lib.rs
+++ b/src/rust/engine/watch/src/lib.rs
@@ -37,7 +37,6 @@ use std::time::Duration;
 use crossbeam_channel::{self, Receiver, RecvTimeoutError, TryRecvError};
 use fs::GitignoreStyleExcludes;
 use log::{debug, trace, warn};
-use logging;
 use notify::{RecommendedWatcher, RecursiveMode, Watcher};
 use parking_lot::Mutex;
 use task_executor::Executor;