diff --git a/Cargo.lock b/Cargo.lock
index 80ca556862..258a5f677b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1486,15 +1486,9 @@ dependencies = [
 
 [[package]]
 name = "hex"
-version = "0.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "805026a5d0141ffc30abb3be3173848ad46a1b1664fe632428479619a3644d77"
-
-[[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_fmt"
@@ -2070,7 +2064,7 @@ version = "1.1.0"
 dependencies = [
  "curve25519-dalek",
  "displaydoc",
- "hex 0.4.2",
+ "hex",
  "hkdf",
  "mc-account-keys",
  "mc-crypto-keys",
@@ -2183,7 +2177,7 @@ dependencies = [
  "digest 0.9.0",
  "displaydoc",
  "failure",
- "hex 0.4.2",
+ "hex",
  "hex_fmt",
  "lazy_static",
  "mbedtls",
@@ -2402,7 +2396,7 @@ name = "mc-consensus-enclave-impl"
 version = "1.1.0"
 dependencies = [
  "cargo-emit",
- "hex 0.4.2",
+ "hex",
  "mbedtls",
  "mc-account-keys",
  "mc-attest-core",
@@ -2508,7 +2502,7 @@ dependencies = [
  "fs_extra",
  "futures 0.3.8",
  "grpcio",
- "hex 0.4.2",
+ "hex",
  "lazy_static",
  "mc-attest-api",
  "mc-attest-core",
@@ -3002,7 +2996,7 @@ dependencies = [
  "displaydoc",
  "failure",
  "grpcio",
- "hex 0.4.2",
+ "hex",
  "hex_fmt",
  "libz-sys",
  "lmdb-rkv",
@@ -3076,7 +3070,7 @@ name = "mc-mobilecoind-json"
 version = "1.1.0"
 dependencies = [
  "grpcio",
- "hex 0.4.2",
+ "hex",
  "mc-api",
  "mc-common",
  "mc-crypto-keys",
@@ -3133,7 +3127,7 @@ name = "mc-peers-test-utils"
 version = "1.1.0"
 dependencies = [
  "grpcio",
- "hex 0.4.2",
+ "hex",
  "mc-common",
  "mc-connection",
  "mc-consensus-api",
@@ -3300,7 +3294,7 @@ dependencies = [
 name = "mc-test-vectors-account-keys"
 version = "1.1.0"
 dependencies = [
- "hex 0.4.2",
+ "hex",
  "mc-account-keys",
  "mc-account-keys-slip10",
  "mc-test-vectors-definitions",
@@ -3407,7 +3401,7 @@ dependencies = [
 name = "mc-util-b58-decoder"
 version = "1.1.0"
 dependencies = [
- "hex 0.4.2",
+ "hex",
  "mc-api",
  "structopt",
 ]
@@ -3472,7 +3466,7 @@ dependencies = [
  "base64 0.12.3",
  "binascii",
  "displaydoc",
- "hex 0.4.2",
+ "hex",
  "mc-util-repr-bytes",
  "serde",
 ]
@@ -3489,7 +3483,7 @@ name = "mc-util-generate-sample-ledger"
 version = "1.1.0"
 dependencies = [
  "curve25519-dalek",
- "hex 0.3.2",
+ "hex",
  "mc-account-keys",
  "mc-common",
  "mc-crypto-keys",
@@ -3514,7 +3508,7 @@ dependencies = [
  "displaydoc",
  "futures 0.3.8",
  "grpcio",
- "hex 0.4.2",
+ "hex",
  "hex_fmt",
  "hmac 0.10.1",
  "lazy_static",
@@ -3552,7 +3546,7 @@ dependencies = [
 name = "mc-util-grpc-token-generator"
 version = "1.1.0"
 dependencies = [
- "hex 0.4.2",
+ "hex",
  "mc-common",
  "mc-util-grpc",
  "percent-encoding 2.1.0",
@@ -3568,7 +3562,7 @@ version = "1.1.0"
 name = "mc-util-keyfile"
 version = "1.1.0"
 dependencies = [
- "hex 0.4.2",
+ "hex",
  "mc-account-keys",
  "mc-crypto-rand",
  "mc-util-from-random",
@@ -3672,7 +3666,7 @@ dependencies = [
  "base64 0.12.3",
  "displaydoc",
  "ed25519",
- "hex 0.4.2",
+ "hex",
  "mc-common",
  "mc-crypto-keys",
  "mc-util-from-random",
@@ -3691,7 +3685,7 @@ dependencies = [
  "displaydoc",
  "futures 0.3.8",
  "grpcio",
- "hex 0.4.2",
+ "hex",
  "lazy_static",
  "lmdb-rkv",
  "mc-account-keys",
@@ -4913,7 +4907,7 @@ dependencies = [
  "base64 0.11.0",
  "bytes 0.4.12",
  "futures 0.1.29",
- "hex 0.4.2",
+ "hex",
  "hmac 0.7.1",
  "http 0.1.21",
  "hyper 0.12.35",
diff --git a/util/generate-sample-ledger/Cargo.toml b/util/generate-sample-ledger/Cargo.toml
index 246d92f910..d1d4a4fe77 100644
--- a/util/generate-sample-ledger/Cargo.toml
+++ b/util/generate-sample-ledger/Cargo.toml
@@ -18,7 +18,7 @@ mc-util-build-info = { path = "../../util/build/info" }
 mc-util-from-random = { path = "../../util/from-random" }
 mc-util-keyfile = { path = "../../util/keyfile" }
 
-hex = "0.3"
+hex = "0.4"
 rand = "0.8"
 rand_hc = "0.3"
 structopt = "0.3"