diff --git a/Cargo.lock b/Cargo.lock
index 433222067ca..0cd15e404ee 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1182,9 +1182,9 @@ checksum = "1847abb9cb65d566acd5942e94aea9c8f547ad02c98e1649326fc0e8910b8b1e"
 
 [[package]]
 name = "futures"
-version = "0.3.19"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "28560757fe2bb34e79f907794bb6b22ae8b0e5c669b638a1132f2592b19035b4"
+checksum = "f73fe65f54d1e12b726f517d3e2135ca3125a437b6d998caf1962961f7172d9e"
 dependencies = [
  "futures-channel",
  "futures-core",
@@ -1197,9 +1197,9 @@ dependencies = [
 
 [[package]]
 name = "futures-channel"
-version = "0.3.19"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ba3dda0b6588335f360afc675d0564c17a77a2bda81ca178a4b6081bd86c7f0b"
+checksum = "c3083ce4b914124575708913bca19bfe887522d6e2e6d0952943f5eac4a74010"
 dependencies = [
  "futures-core",
  "futures-sink",
@@ -1207,15 +1207,15 @@ dependencies = [
 
 [[package]]
 name = "futures-core"
-version = "0.3.19"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d0c8ff0461b82559810cdccfde3215c3f373807f5e5232b71479bff7bb2583d7"
+checksum = "0c09fd04b7e4073ac7156a9539b57a484a8ea920f79c7c675d05d289ab6110d3"
 
 [[package]]
 name = "futures-executor"
-version = "0.3.19"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "29d6d2ff5bb10fb95c85b8ce46538a2e5f5e7fdc755623a7d4529ab8a4ed9d2a"
+checksum = "9420b90cfa29e327d0429f19be13e7ddb68fa1cccb09d65e5706b8c7a749b8a6"
 dependencies = [
  "futures-core",
  "futures-task",
@@ -1224,15 +1224,15 @@ dependencies = [
 
 [[package]]
 name = "futures-io"
-version = "0.3.19"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b1f9d34af5a1aac6fb380f735fe510746c38067c5bf16c7fd250280503c971b2"
+checksum = "fc4045962a5a5e935ee2fdedaa4e08284547402885ab326734432bed5d12966b"
 
 [[package]]
 name = "futures-macro"
-version = "0.3.19"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6dbd947adfffb0efc70599b3ddcf7b5597bb5fa9e245eb99f62b3a5f7bb8bd3c"
+checksum = "33c1e13800337f4d4d7a316bf45a567dbcb6ffe087f16424852d97e97a91f512"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1241,21 +1241,21 @@ dependencies = [
 
 [[package]]
 name = "futures-sink"
-version = "0.3.19"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e3055baccb68d74ff6480350f8d6eb8fcfa3aa11bdc1a1ae3afdd0514617d508"
+checksum = "21163e139fa306126e6eedaf49ecdb4588f939600f0b1e770f4205ee4b7fa868"
 
 [[package]]
 name = "futures-task"
-version = "0.3.19"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ee7c6485c30167ce4dfb83ac568a849fe53274c831081476ee13e0dce1aad72"
+checksum = "57c66a976bf5909d801bbef33416c41372779507e7a6b3a5e25e4749c58f776a"
 
 [[package]]
 name = "futures-util"
-version = "0.3.19"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d9b5cf40b47a271f77a8b1bec03ca09044d99d2372c0de244e66430761127164"
+checksum = "d8b7abd5d659d9b90c8cba917f6ec750a74e2dc23902ef9cd4cc8c8b22e6036a"
 dependencies = [
  "futures-channel",
  "futures-core",
diff --git a/common/Cargo.toml b/common/Cargo.toml
index 7b1e639d0f9..9139062c7b4 100644
--- a/common/Cargo.toml
+++ b/common/Cargo.toml
@@ -10,7 +10,7 @@ api_identity = { path = "../api_identity" }
 backoff = { version = "0.3.0", features = [ "tokio" ] }
 chrono = { version = "0.4", features = [ "serde" ] }
 dropshot = {  git = "https://github.com/oxidecomputer/dropshot", branch = "main", features = [ "usdt-probes" ] }
-futures = "0.3.18"
+futures = "0.3.21"
 http = "0.2.5"
 hyper = "0.14"
 ipnetwork = "0.18"
diff --git a/nexus/Cargo.toml b/nexus/Cargo.toml
index 41187872a61..f2e1bc644fb 100644
--- a/nexus/Cargo.toml
+++ b/nexus/Cargo.toml
@@ -16,7 +16,7 @@ cookie = "0.16"
 crucible-agent-client = { git = "https://github.com/oxidecomputer/crucible", rev = "078d364e14d57d5faa3a44001c65709935419779" }
 # Tracking pending 2.0 version.
 diesel = { git = "https://github.com/diesel-rs/diesel", rev = "ce77c382", features = ["postgres", "r2d2", "chrono", "serde_json", "network-address", "uuid"] }
-futures = "0.3.18"
+futures = "0.3.21"
 hex = "0.4.3"
 http = "0.2.5"
 hyper = "0.14"
diff --git a/oximeter/instruments/Cargo.toml b/oximeter/instruments/Cargo.toml
index 67d1fa7fd4a..849d5650e25 100644
--- a/oximeter/instruments/Cargo.toml
+++ b/oximeter/instruments/Cargo.toml
@@ -7,7 +7,7 @@ license = "MPL-2.0"
 [dependencies]
 chrono = { version = "0.4", features = [ "serde" ] }
 dropshot = { git = "https://github.com/oxidecomputer/dropshot", branch = "main", features = [ "usdt-probes" ] }
-futures = "0.3.18"
+futures = "0.3.21"
 oximeter = { path = "../oximeter" }
 http = { version = "0.2.5", optional = true }
 uuid = { version = "0.8.2", features = [ "v4", "serde" ] }
diff --git a/sled-agent/Cargo.toml b/sled-agent/Cargo.toml
index f689c509656..9c0f0763f08 100644
--- a/sled-agent/Cargo.toml
+++ b/sled-agent/Cargo.toml
@@ -14,7 +14,7 @@ chrono = { version = "0.4", features = [ "serde" ] }
 # Only used by the simulated sled agent.
 crucible-agent-client = { git = "https://github.com/oxidecomputer/crucible", rev = "078d364e14d57d5faa3a44001c65709935419779" }
 dropshot = { git = "https://github.com/oxidecomputer/dropshot", branch = "main", features = [ "usdt-probes" ] }
-futures = "0.3.18"
+futures = "0.3.21"
 ipnetwork = "0.18"
 nexus-client = { path = "../nexus-client" }
 omicron-common = { path = "../common" }
diff --git a/test-utils/Cargo.toml b/test-utils/Cargo.toml
index fa1f69f1df0..bbddda114f8 100644
--- a/test-utils/Cargo.toml
+++ b/test-utils/Cargo.toml
@@ -6,7 +6,7 @@ license = "MPL-2.0"
 
 [dependencies]
 anyhow = "1.0"
-futures = "0.3.18"
+futures = "0.3.21"
 libc = "0.2.116"
 omicron-common = { path = "../common" }
 postgres-protocol = "0.6.3"