diff --git a/Cargo.lock b/Cargo.lock
index 06b19be0..4932115a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1390,9 +1390,9 @@ dependencies = [
 
 [[package]]
 name = "hex"
-version = "0.4.2"
+version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "644f9158b2f133fd50f5fb3242878846d9eb792e445c893805ff0e3824006e35"
+checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
 
 [[package]]
 name = "hostname"
diff --git a/zebra-script/Cargo.toml b/zebra-script/Cargo.toml
index 47baa9d0..bf00a0f8 100644
--- a/zebra-script/Cargo.toml
+++ b/zebra-script/Cargo.toml
@@ -14,6 +14,6 @@ thiserror = "1.0.24"
 displaydoc = "0.1.7"
 
 [dev-dependencies]
-hex = "0.4.2"
+hex = "0.4.3"
 lazy_static = "1.4.0"
 zebra-test = { path = "../zebra-test" }
diff --git a/zebra-state/Cargo.toml b/zebra-state/Cargo.toml
index e05fe483..e9f4172d 100644
--- a/zebra-state/Cargo.toml
+++ b/zebra-state/Cargo.toml
@@ -11,7 +11,7 @@ edition = "2018"
 zebra-chain = { path = "../zebra-chain" }
 
 dirs = "3.0.1"
-hex = "0.4.2"
+hex = "0.4.3"
 lazy_static = "1.4.0"
 regex = "1"
 serde = { version = "1", features = ["serde_derive"] }
diff --git a/zebra-test/Cargo.toml b/zebra-test/Cargo.toml
index 5f56b419..da871bce 100644
--- a/zebra-test/Cargo.toml
+++ b/zebra-test/Cargo.toml
@@ -8,7 +8,7 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-hex = "0.4.2"
+hex = "0.4.3"
 lazy_static = "1.4.0"
 tower = { version = "0.4", features = ["util"] }
 futures = "0.3.13"