diff --git a/Cargo.lock b/Cargo.lock
index ba64b224a..fb7058c83 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4151,9 +4151,9 @@ checksum = "71d96e3f3c0b6325d8ccd83c33b28acb183edcb6c67938ba104ec546854b0882"
 
 [[package]]
 name = "merlin"
-version = "2.0.0"
+version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c6feca46f4fa3443a01769d768727f10c10a20fdb65e52dc16a81f0c8269bb78"
+checksum = "4e261cf0f8b3c42ded9f7d2bb59dea03aa52bc8a1cbc7482f9fc3fd1229d3b42"
 dependencies = [
  "byteorder",
  "keccak",
@@ -4161,6 +4161,18 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "merlin"
+version = "3.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "58c38e2799fc0978b65dfff8023ec7843e2330bb462f19198840b34b6582397d"
+dependencies = [
+ "byteorder",
+ "keccak",
+ "rand_core 0.6.1",
+ "zeroize",
+]
+
 [[package]]
 name = "metered-channel"
 version = "0.9.9"
@@ -6078,7 +6090,7 @@ dependencies = [
  "kvdb-memorydb",
  "lru",
  "maplit",
- "merlin",
+ "merlin 3.0.0",
  "parity-scale-codec",
  "parking_lot 0.11.1",
  "polkadot-node-jaeger",
@@ -8379,7 +8391,7 @@ dependencies = [
  "fork-tree",
  "futures 0.3.16",
  "log",
- "merlin",
+ "merlin 2.0.1",
  "num-bigint",
  "num-rational 0.2.4",
  "num-traits",
@@ -9143,7 +9155,7 @@ dependencies = [
  "arrayvec 0.5.2",
  "curve25519-dalek 2.1.0",
  "getrandom 0.1.14",
- "merlin",
+ "merlin 2.0.1",
  "rand 0.7.3",
  "rand_core 0.5.1",
  "sha2 0.8.2",
@@ -9652,7 +9664,7 @@ version = "0.10.0-dev"
 source = "git+https://github.com/compound-finance/substrate?branch=gateway#b7a1a2cda5c860f18a7802051e881c5062828042"
 dependencies = [
  "async-trait",
- "merlin",
+ "merlin 2.0.1",
  "parity-scale-codec",
  "serde",
  "sp-api",
@@ -9708,7 +9720,7 @@ dependencies = [
  "lazy_static",
  "libsecp256k1 0.6.0",
  "log",
- "merlin",
+ "merlin 2.0.1",
  "num-traits",
  "parity-scale-codec",
  "parity-util-mem",
@@ -9839,7 +9851,7 @@ dependencies = [
  "async-trait",
  "derive_more",
  "futures 0.3.16",
- "merlin",
+ "merlin 2.0.1",
  "parity-scale-codec",
  "parking_lot 0.11.1",
  "schnorrkel",
diff --git a/node/core/approval-voting/Cargo.toml b/node/core/approval-voting/Cargo.toml
index fe9013bb5..3953f9557 100644
--- a/node/core/approval-voting/Cargo.toml
+++ b/node/core/approval-voting/Cargo.toml
@@ -11,7 +11,7 @@ parity-scale-codec = { version = "2.0.0", default-features = false, features = [
 tracing = "0.1.26"
 bitvec = { version = "0.20.1", default-features = false, features = ["alloc"] }
 lru = "0.6"
-merlin = "2.0"
+merlin = "3.0"
 schnorrkel = "0.9.1"
 kvdb = "0.10.0"
 derive_more = "0.99.14"