diff --git a/polkadot/Cargo.lock b/polkadot/Cargo.lock
index fbd0ff5e8f..30d3335829 100644
--- a/polkadot/Cargo.lock
+++ b/polkadot/Cargo.lock
@@ -2665,9 +2665,9 @@ 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 = "hex-literal"
diff --git a/polkadot/node/test/service/Cargo.toml b/polkadot/node/test/service/Cargo.toml
index 6881205621..444e36f22a 100644
--- a/polkadot/node/test/service/Cargo.toml
+++ b/polkadot/node/test/service/Cargo.toml
@@ -7,7 +7,7 @@ edition = "2018"
 [dependencies]
 futures = "0.3.15"
 futures01 = { package = "futures", version = "0.1.29" }
-hex = "0.4.2"
+hex = "0.4.3"
 tracing = "0.1.26"
 rand = "0.8.3"
 tempfile = "3.2.0"
diff --git a/polkadot/utils/staking-miner/Cargo.toml b/polkadot/utils/staking-miner/Cargo.toml
index 7c64fe68c3..33cd5c2f9c 100644
--- a/polkadot/utils/staking-miner/Cargo.toml
+++ b/polkadot/utils/staking-miner/Cargo.toml
@@ -13,7 +13,7 @@ structopt = "0.3.0"
 jsonrpsee-ws-client = { version = "0.3.0", default-features = false, features = ["tokio02"] }
 serde_json = "1.0"
 serde = "1.0.0"
-hex = "0.4.0"
+hex = "0.4.3"
 lazy_static = "1.4.0"
 paste = "1.0.5"
 thiserror = "1.0.0"