diff --git a/Cargo.lock b/Cargo.lock
index 9a1e42a..4917d27 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -17,6 +17,15 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
+[[package]]
+name = "aho-corasick"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "atty"
 version = "0.2.14"
@@ -49,6 +58,25 @@ dependencies = [
  "rustc-demangle",
 ]
 
+[[package]]
+name = "bindgen"
+version = "0.51.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ebd71393f1ec0509b553aa012b9b58e81dadbdff7130bd3b8cba576e69b32f75"
+dependencies = [
+ "bitflags 1.3.2",
+ "cexpr",
+ "cfg-if 0.1.10",
+ "clang-sys",
+ "lazy_static",
+ "peeking_take_while",
+ "proc-macro2",
+ "quote",
+ "regex",
+ "rustc-hash",
+ "shlex",
+]
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -73,6 +101,15 @@ version = "1.0.90"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8cd6604a82acf3039f1144f54b8eb34e91ffba622051189e71b781822d5ee1f5"
 
+[[package]]
+name = "cexpr"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fce5b5fb86b0c57c20c834c1b412fd09c77c8a59b9473f86272709e78874cd1d"
+dependencies = [
+ "nom",
+]
+
 [[package]]
 name = "cfg-if"
 version = "0.1.10"
@@ -85,6 +122,17 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "clang-sys"
+version = "0.28.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81de550971c976f176130da4b2978d3b524eaa0fd9ac31f3ceb5ae1231fb4853"
+dependencies = [
+ "glob",
+ "libc",
+ "libloading",
+]
+
 [[package]]
 name = "clap"
 version = "3.2.25"
@@ -229,11 +277,17 @@ version = "0.28.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4271d37baee1b8c7e4b708028c57d816cf9d2434acb33a549475f78c181f6253"
 
+[[package]]
+name = "glob"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2fabcfbdc87f4758337ca535fb41a6d701b65693ce38287d856d1674551ec9b"
+
 [[package]]
 name = "grpcio"
-version = "0.4.7"
+version = "0.5.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9ac757a85603e4f8c40a9f94be06a5ad412acab80b39b4e8895ca931b6619910"
+checksum = "40601ccb2814bbb83312b229cf220eb39460dafcf1c561c6b2e9213291976db5"
 dependencies = [
  "futures",
  "grpcio-sys",
@@ -253,14 +307,17 @@ dependencies = [
 
 [[package]]
 name = "grpcio-sys"
-version = "0.4.7"
+version = "0.5.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b2f22fb0327f153acccedbe91894dd0fb15bb6f202d8195665cd206af0402b0"
+checksum = "a303c6c0576a9327f522ad5152a4869160f48df0c5bc5fe908397e31f8db0df2"
 dependencies = [
+ "bindgen",
  "cc",
  "cmake",
  "libc",
+ "libz-sys",
  "pkg-config",
+ "walkdir",
 ]
 
 [[package]]
@@ -350,6 +407,28 @@ version = "0.2.153"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
 
+[[package]]
+name = "libloading"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2b111a074963af1d37a139918ac6d49ad1d0d5e47f72fd55388619691a7d753"
+dependencies = [
+ "cc",
+ "winapi 0.3.9",
+]
+
+[[package]]
+name = "libz-sys"
+version = "1.1.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5e143b5e666b2695d28f6bca6497720813f699c9602dd7f5cac91008b8ada7f9"
+dependencies = [
+ "cc",
+ "libc",
+ "pkg-config",
+ "vcpkg",
+]
+
 [[package]]
 name = "linux-raw-sys"
 version = "0.4.13"
@@ -509,6 +588,16 @@ dependencies = [
  "void",
 ]
 
+[[package]]
+name = "nom"
+version = "4.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2ad2a91a8e869eeb30b9cb3119ae87773a8f4ae617f41b1eb9c154b2905f7bd6"
+dependencies = [
+ "memchr",
+ "version_check",
+]
+
 [[package]]
 name = "num_cpus"
 version = "1.16.0"
@@ -540,6 +629,12 @@ version = "6.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e2355d85b9a3786f481747ced0e0ff2ba35213a1f9bd406ed906554d7af805a1"
 
+[[package]]
+name = "peeking_take_while"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "19b17cddbe7ec3f8bc800887bab5e717348c95ea2ca0b1bf0837fb964dc67099"
+
 [[package]]
 name = "pin-project-lite"
 version = "0.1.12"
@@ -609,12 +704,47 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "regex"
+version = "1.10.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c117dbdfde9c8308975b6a18d71f3f385c89461f7b3fb054288ecf2a2058ba4c"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "86b83b8b9847f9bf95ef68afb0b8e6cdb80f498442f5179a29fad448fcc1eaea"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "adad44e29e4c806119491a7f06f03de4d1af22c3a680dd47f1e6e179439d1f56"
+
 [[package]]
 name = "rustc-demangle"
 version = "0.1.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d626bb9dae77e28219937af045c257c28bfd3f69333c512553507f5f9798cb76"
 
+[[package]]
+name = "rustc-hash"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
+
 [[package]]
 name = "rustix"
 version = "0.38.32"
@@ -628,6 +758,15 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "same-file"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
+dependencies = [
+ "winapi-util",
+]
+
 [[package]]
 name = "serde"
 version = "1.0.197"
@@ -657,6 +796,12 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "shlex"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7fdf1b9db47230893d76faad238fd6097fd6d6a9245cd7a4d90dbd639536bbd2"
+
 [[package]]
 name = "signal-hook-registry"
 version = "1.4.1"
@@ -837,12 +982,34 @@ version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f962df74c8c05a667b5ee8bcf162993134c104e96440b663c8daa176dc772d8c"
 
+[[package]]
+name = "vcpkg"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
+
+[[package]]
+name = "version_check"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
+
 [[package]]
 name = "void"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
 
+[[package]]
+name = "walkdir"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29790946404f91d9c5d06f9874efddea1dc06c5efe94541a7d6863108e3a5e4b"
+dependencies = [
+ "same-file",
+ "winapi-util",
+]
+
 [[package]]
 name = "which"
 version = "4.4.2"
diff --git a/Cargo.toml b/Cargo.toml
index db455a1..d8b5bc5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,4 +1,5 @@
 [workspace]
+resolver = "2"
 
 members = [
     "memds-cli",
diff --git a/memds-cli/Cargo.toml b/memds-cli/Cargo.toml
index 45d584d..dd2f72e 100644
--- a/memds-cli/Cargo.toml
+++ b/memds-cli/Cargo.toml
@@ -2,7 +2,7 @@
 name = "memds-cli"
 version = "0.2.0"
 authors = ["Jeff Garzik <jeff@bloq.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
@@ -10,6 +10,6 @@ edition = "2018"
 memds-proto = { path = "../memds-proto" }
 clap = "3"
 futures = "0.1"
-grpcio = { version = "0.4", features = ["openssl"] }
+grpcio = { version = "0.5", features = ["openssl"] }
 protobuf = "~2"
 log = "0.4"
diff --git a/memds-proto/Cargo.toml b/memds-proto/Cargo.toml
index f609783..25701ab 100644
--- a/memds-proto/Cargo.toml
+++ b/memds-proto/Cargo.toml
@@ -2,13 +2,13 @@
 name = "memds-proto"
 version = "0.2.0"
 authors = ["Jeff Garzik <jeff@bloq.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
 futures = "0.1"
-grpcio = { version = "0.4", features = ["openssl"] }
+grpcio = { version = "0.5", features = ["openssl"] }
 protobuf = "~2"
 tokio = { version = "0.2", features = ["full"] }
 tokio-util = { version = "0.2", features = ["full"] }
diff --git a/memds-server/Cargo.toml b/memds-server/Cargo.toml
index c3c4966..f9dbd4f 100644
--- a/memds-server/Cargo.toml
+++ b/memds-server/Cargo.toml
@@ -2,14 +2,14 @@
 name = "memds-server"
 version = "0.2.0"
 authors = ["Jeff Garzik <jeff@bloq.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
 memds-proto = { path = "../memds-proto" }
 futures = "0.1"
-grpcio = { version = "0.4", features = ["openssl"] }
+grpcio = { version = "0.5", features = ["openssl"] }
 protobuf = "~2"
 log = "0.4"
 clap = "3"
diff --git a/memds-server/src/main.rs b/memds-server/src/main.rs
index e2e1b39..08a8341 100644
--- a/memds-server/src/main.rs
+++ b/memds-server/src/main.rs
@@ -111,7 +111,7 @@ fn main() {
         .build()
         .unwrap();
     server.start();
-    for &(ref host, port) in server.bind_addrs() {
+    for (host, port) in server.bind_addrs() {
         println!("listening on {}:{}", host, port);
     }
     let (tx, rx) = oneshot::channel();