diff --git a/Cargo.lock b/Cargo.lock
index 0fe7059d..84225549 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -12,7 +12,7 @@ dependencies = [
  "arc-swap",
  "backtrace",
  "canonical-path",
- "clap 4.3.19",
+ "clap 4.3.21",
  "color-eyre",
  "fs-err",
  "once_cell",
@@ -744,9 +744,9 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "4.3.19"
+version = "4.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5fd304a20bff958a57f04c4e96a2e7594cc4490a0e809cbd48bb6437edaa452d"
+checksum = "c27cdf28c0f604ba3f512b0c9a409f8de8513e4816705deb0498b627e7c3a3fd"
 dependencies = [
  "clap_builder",
  "clap_derive",
@@ -755,9 +755,9 @@ dependencies = [
 
 [[package]]
 name = "clap_builder"
-version = "4.3.19"
+version = "4.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "01c6a3f08f1fe5662a35cfe393aec09c4df95f60ee93b7556505260f75eee9e1"
+checksum = "08a9f1ab5e9f01a9b81f202e8562eb9a10de70abf9eaeac1be465c28b75aa4aa"
 dependencies = [
  "anstream",
  "anstyle",
@@ -916,7 +916,7 @@ dependencies = [
  "anes",
  "cast",
  "ciborium",
- "clap 4.3.19",
+ "clap 4.3.21",
  "criterion-plot",
  "is-terminal",
  "itertools 0.10.5",
@@ -5751,7 +5751,7 @@ dependencies = [
  "abscissa_core",
  "atty",
  "chrono",
- "clap 4.3.19",
+ "clap 4.3.21",
  "color-eyre",
  "console-subscriber",
  "dirs",
diff --git a/zebrad/Cargo.toml b/zebrad/Cargo.toml
index dcc32e20..27af2edd 100644
--- a/zebrad/Cargo.toml
+++ b/zebrad/Cargo.toml
@@ -153,7 +153,7 @@ zebra-state = { path = "../zebra-state", version = "1.0.0-beta.28" }
 zebra-utils = { path = "../zebra-utils", version = "1.0.0-beta.28", optional = true }
 
 abscissa_core = "0.7.0"
-clap = { version = "4.3.19", features = ["cargo"] }
+clap = { version = "4.3.21", features = ["cargo"] }
 chrono = { version = "0.4.26", default-features = false, features = ["clock", "std"] }
 humantime-serde = "1.1.1"
 indexmap = "2.0.0"