diff --git a/Cargo.lock b/Cargo.lock
index 0d0a9a20f4..ffdb85fce0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1758,9 +1758,9 @@ 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 = "hidapi"
diff --git a/merkle-tree/Cargo.toml b/merkle-tree/Cargo.toml
index 9ed64fd48c..ed1ae18bba 100644
--- a/merkle-tree/Cargo.toml
+++ b/merkle-tree/Cargo.toml
@@ -18,7 +18,7 @@ fast-math = "0.1"
 matches = "0.1.8"
 
 [dev-dependencies]
-hex = "0.4.2"
+hex = "0.4.3"
 
 [lib]
 crate-type = ["lib"]
diff --git a/programs/bpf/Cargo.lock b/programs/bpf/Cargo.lock
index fafb59341b..313becb0ba 100644
--- a/programs/bpf/Cargo.lock
+++ b/programs/bpf/Cargo.lock
@@ -1241,9 +1241,9 @@ 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 = "hidapi"
diff --git a/sdk/Cargo.toml b/sdk/Cargo.toml
index eaa8ecc805..a6a80ed4c8 100644
--- a/sdk/Cargo.toml
+++ b/sdk/Cargo.toml
@@ -49,7 +49,7 @@ digest = { version = "0.9.0", optional = true }
 ed25519-dalek = { version = "=1.0.1", optional = true }
 ed25519-dalek-bip32 = { version = "0.1.1", optional = true }
 generic-array = { version = "0.14.4", default-features = false, features = ["serde", "more_lengths"], optional = true }
-hex = "0.4.2"
+hex = "0.4.3"
 hmac = "0.11.0"
 itertools =  "0.9.0"
 lazy_static = "1.4.0"