diff --git a/Cargo.lock b/Cargo.lock
index f1f3b7e00c65a..ff21ec8dd0109 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -8490,9 +8490,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.64"
+version = "1.0.68"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "799e97dc9fdae36a5c8b8f2cae9ce2ee9fdce2058c57a93e6099d919fd982f79"
+checksum = "0f690853975602e1bfe1ccbf50504d67174e3bcf340f23b5ea9992e0587a52d8"
 dependencies = [
  "itoa",
  "ryu",
diff --git a/bin/node/bench/Cargo.toml b/bin/node/bench/Cargo.toml
index dee927cf944ba..b19a71966fb87 100644
--- a/bin/node/bench/Cargo.toml
+++ b/bin/node/bench/Cargo.toml
@@ -17,7 +17,7 @@ sc-client-api = { version = "4.0.0-dev", path = "../../../client/api/" }
 sp-runtime = { version = "4.0.0-dev", path = "../../../primitives/runtime" }
 sp-state-machine = { version = "0.10.0-dev", path = "../../../primitives/state-machine" }
 serde = "1.0.126"
-serde_json = "1.0.41"
+serde_json = "1.0.68"
 structopt = "0.3"
 derive_more = "0.99.2"
 kvdb = "0.10.0"
diff --git a/client/chain-spec/Cargo.toml b/client/chain-spec/Cargo.toml
index 3243430989c73..8af2996e968d8 100644
--- a/client/chain-spec/Cargo.toml
+++ b/client/chain-spec/Cargo.toml
@@ -18,7 +18,7 @@ impl-trait-for-tuples = "0.2.1"
 sc-network = { version = "0.10.0-dev", path = "../network" }
 sp-core = { version = "4.0.0-dev", path = "../../primitives/core" }
 serde = { version = "1.0.126", features = ["derive"] }
-serde_json = "1.0.41"
+serde_json = "1.0.68"
 sp-runtime = { version = "4.0.0-dev", path = "../../primitives/runtime" }
 sc-telemetry = { version = "4.0.0-dev", path = "../telemetry" }
 codec = { package = "parity-scale-codec", version = "2.0.0" }
diff --git a/client/cli/Cargo.toml b/client/cli/Cargo.toml
index 97058110ad920..e7a0330e76e0c 100644
--- a/client/cli/Cargo.toml
+++ b/client/cli/Cargo.toml
@@ -23,7 +23,7 @@ parity-scale-codec = "2.0.0"
 hex = "0.4.2"
 rand = "0.7.3"
 tiny-bip39 = "0.8.0"
-serde_json = "1.0.41"
+serde_json = "1.0.68"
 sc-keystore = { version = "4.0.0-dev", path = "../keystore" }
 sp-panic-handler = { version = "3.0.0", path = "../../primitives/panic-handler" }
 sc-client-api = { version = "4.0.0-dev", path = "../api" }
diff --git a/client/consensus/babe/rpc/Cargo.toml b/client/consensus/babe/rpc/Cargo.toml
index 0f6c411a730e4..8d5625705a48c 100644
--- a/client/consensus/babe/rpc/Cargo.toml
+++ b/client/consensus/babe/rpc/Cargo.toml
@@ -33,7 +33,7 @@ sp-keystore = { version = "0.10.0-dev", path = "../../../../primitives/keystore"
 
 [dev-dependencies]
 sc-consensus = { version = "0.10.0-dev", path = "../../../consensus/common" }
-serde_json = "1.0.50"
+serde_json = "1.0.68"
 sp-keyring = { version = "4.0.0-dev", path = "../../../../primitives/keyring" }
 sc-keystore = { version = "4.0.0-dev", path = "../../../keystore" }
 substrate-test-runtime-client = { version = "2.0.0", path = "../../../../test-utils/runtime/client" }
diff --git a/client/finality-grandpa/Cargo.toml b/client/finality-grandpa/Cargo.toml
index 40385a2faea57..ffdfc80c4eb9b 100644
--- a/client/finality-grandpa/Cargo.toml
+++ b/client/finality-grandpa/Cargo.toml
@@ -35,7 +35,7 @@ sp-keystore = { version = "0.10.0-dev", path = "../../primitives/keystore" }
 sp-api = { version = "4.0.0-dev", path = "../../primitives/api" }
 sc-telemetry = { version = "4.0.0-dev", path = "../telemetry" }
 sc-keystore = { version = "4.0.0-dev", path = "../keystore" }
-serde_json = "1.0.41"
+serde_json = "1.0.68"
 sc-client-api = { version = "4.0.0-dev", path = "../api" }
 sp-blockchain = { version = "4.0.0-dev", path = "../../primitives/blockchain" }
 sc-network = { version = "0.10.0-dev", path = "../network" }
diff --git a/client/keystore/Cargo.toml b/client/keystore/Cargo.toml
index 11d6f5cb1e241..17c651a91decd 100644
--- a/client/keystore/Cargo.toml
+++ b/client/keystore/Cargo.toml
@@ -22,7 +22,7 @@ sp-core = { version = "4.0.0-dev", path = "../../primitives/core" }
 sp-keystore = { version = "0.10.0-dev", path = "../../primitives/keystore" }
 hex = "0.4.0"
 parking_lot = "0.11.1"
-serde_json = "1.0.41"
+serde_json = "1.0.68"
 
 [dev-dependencies]
 tempfile = "3.1.0"
diff --git a/client/network/Cargo.toml b/client/network/Cargo.toml
index 283ac7c68f3e8..873c2a847a29a 100644
--- a/client/network/Cargo.toml
+++ b/client/network/Cargo.toml
@@ -47,7 +47,7 @@ sc-block-builder = { version = "0.10.0-dev", path = "../block-builder" }
 sc-client-api = { version = "4.0.0-dev", path = "../api" }
 sc-peerset = { version = "4.0.0-dev", path = "../peerset" }
 serde = { version = "1.0.126", features = ["derive"] }
-serde_json = "1.0.41"
+serde_json = "1.0.68"
 smallvec = "1.5.0"
 sp-arithmetic = { version = "4.0.0-dev", path = "../../primitives/arithmetic" }
 sp-blockchain = { version = "4.0.0-dev", path = "../../primitives/blockchain" }
diff --git a/client/peerset/Cargo.toml b/client/peerset/Cargo.toml
index 9e83ede675d02..5962620d6e06e 100644
--- a/client/peerset/Cargo.toml
+++ b/client/peerset/Cargo.toml
@@ -19,7 +19,7 @@ futures = "0.3.9"
 libp2p = { version = "0.39.1", default-features = false }
 sc-utils = { version = "4.0.0-dev", path = "../utils"}
 log = "0.4.8"
-serde_json = "1.0.41"
+serde_json = "1.0.68"
 wasm-timer = "0.2"
 
 [dev-dependencies]
diff --git a/client/rpc-api/Cargo.toml b/client/rpc-api/Cargo.toml
index 86fd24c24e7fa..6342abb1a3c41 100644
--- a/client/rpc-api/Cargo.toml
+++ b/client/rpc-api/Cargo.toml
@@ -28,7 +28,7 @@ sp-version = { version = "4.0.0-dev", path = "../../primitives/version" }
 sp-runtime = { path = "../../primitives/runtime", version = "4.0.0-dev" }
 sc-chain-spec = { path = "../chain-spec", version = "4.0.0-dev" }
 serde = { version = "1.0.126", features = ["derive"] }
-serde_json = "1.0.41"
+serde_json = "1.0.68"
 sc-transaction-pool-api = { version = "4.0.0-dev", path = "../transaction-pool/api" }
 sp-rpc = { version = "4.0.0-dev", path = "../../primitives/rpc" }
 sp-tracing = { version = "4.0.0-dev", path = "../../primitives/tracing" }
diff --git a/client/rpc-servers/Cargo.toml b/client/rpc-servers/Cargo.toml
index e249bb1ed8ae8..26a05a8263dc4 100644
--- a/client/rpc-servers/Cargo.toml
+++ b/client/rpc-servers/Cargo.toml
@@ -18,7 +18,7 @@ jsonrpc-core = "18.0.0"
 pubsub = { package = "jsonrpc-pubsub", version = "18.0.0" }
 log = "0.4.8"
 prometheus-endpoint = { package = "substrate-prometheus-endpoint", path = "../../utils/prometheus", version = "0.9.0"}
-serde_json = "1.0.41"
+serde_json = "1.0.68"
 tokio = "1.10"
 http = { package = "jsonrpc-http-server", version = "18.0.0" }
 ipc = { package = "jsonrpc-ipc-server", version = "18.0.0" }
diff --git a/client/rpc/Cargo.toml b/client/rpc/Cargo.toml
index 9957bc999a8bb..427800f74ddf2 100644
--- a/client/rpc/Cargo.toml
+++ b/client/rpc/Cargo.toml
@@ -23,7 +23,7 @@ log = "0.4.8"
 sp-core = { version = "4.0.0-dev", path = "../../primitives/core" }
 rpc = { package = "jsonrpc-core", version = "18.0.0" }
 sp-version = { version = "4.0.0-dev", path = "../../primitives/version" }
-serde_json = "1.0.41"
+serde_json = "1.0.68"
 sp-session = { version = "4.0.0-dev", path = "../../primitives/session" }
 sp-offchain = { version = "4.0.0-dev", path = "../../primitives/offchain" }
 sp-runtime = { version = "4.0.0-dev", path = "../../primitives/runtime" }
diff --git a/client/service/Cargo.toml b/client/service/Cargo.toml
index ca81ede9a6a90..5120cc8f4dfaa 100644
--- a/client/service/Cargo.toml
+++ b/client/service/Cargo.toml
@@ -34,7 +34,7 @@ exit-future = "0.2.0"
 pin-project = "1.0.4"
 hash-db = "0.15.2"
 serde = "1.0.126"
-serde_json = "1.0.41"
+serde_json = "1.0.68"
 sc-keystore = { version = "4.0.0-dev", path = "../keystore" }
 sp-runtime = { version = "4.0.0-dev", path = "../../primitives/runtime" }
 sp-trie = { version = "4.0.0-dev", path = "../../primitives/trie" }
diff --git a/client/sync-state-rpc/Cargo.toml b/client/sync-state-rpc/Cargo.toml
index 9da9944a54547..b81fd1fd5c611 100644
--- a/client/sync-state-rpc/Cargo.toml
+++ b/client/sync-state-rpc/Cargo.toml
@@ -23,7 +23,7 @@ sc-consensus-babe = { version = "0.10.0-dev", path = "../consensus/babe" }
 sc-consensus-epochs = { version = "0.10.0-dev", path = "../consensus/epochs" }
 sc-finality-grandpa = { version = "0.10.0-dev", path = "../finality-grandpa" }
 sc-rpc-api = { version = "0.10.0-dev", path = "../rpc-api" }
-serde_json = "1.0.58"
+serde_json = "1.0.68"
 serde = { version = "1.0.126", features = ["derive"] }
 sp-blockchain = { version = "4.0.0-dev", path = "../../primitives/blockchain" }
 sp-runtime = { version = "4.0.0-dev", path = "../../primitives/runtime" }
diff --git a/client/telemetry/Cargo.toml b/client/telemetry/Cargo.toml
index 4dafeb205544b..f115017f09701 100644
--- a/client/telemetry/Cargo.toml
+++ b/client/telemetry/Cargo.toml
@@ -23,6 +23,6 @@ log = "0.4.8"
 pin-project = "1.0.4"
 rand = "0.7.2"
 serde = { version = "1.0.126", features = ["derive"] }
-serde_json = "1.0.41"
+serde_json = "1.0.68"
 chrono = "0.4.19"
 thiserror = "1.0.21"
diff --git a/frame/merkle-mountain-range/rpc/Cargo.toml b/frame/merkle-mountain-range/rpc/Cargo.toml
index 9182afbb1f5f5..5a0f114e50173 100644
--- a/frame/merkle-mountain-range/rpc/Cargo.toml
+++ b/frame/merkle-mountain-range/rpc/Cargo.toml
@@ -27,4 +27,4 @@ sp-runtime = { version = "4.0.0-dev", path = "../../../primitives/runtime" }
 pallet-mmr-primitives = { version = "4.0.0-dev", path = "../primitives" }
 
 [dev-dependencies]
-serde_json = "1.0.41"
+serde_json = "1.0.68"
diff --git a/frame/transaction-payment/Cargo.toml b/frame/transaction-payment/Cargo.toml
index 12b7622c1b18f..0bcc422bb8476 100644
--- a/frame/transaction-payment/Cargo.toml
+++ b/frame/transaction-payment/Cargo.toml
@@ -28,7 +28,7 @@ frame-support = { version = "4.0.0-dev", default-features = false, path = "../su
 frame-system = { version = "4.0.0-dev", default-features = false, path = "../system" }
 
 [dev-dependencies]
-serde_json = "1.0.41"
+serde_json = "1.0.68"
 pallet-balances = { version = "4.0.0-dev", path = "../balances" }
 
 [features]
diff --git a/primitives/rpc/Cargo.toml b/primitives/rpc/Cargo.toml
index 73c42555f1f1e..8e1b91a9acb21 100644
--- a/primitives/rpc/Cargo.toml
+++ b/primitives/rpc/Cargo.toml
@@ -18,4 +18,4 @@ sp-core = { version = "4.0.0-dev", path = "../core" }
 rustc-hash = "1.1.0"
 
 [dev-dependencies]
-serde_json = "1.0.41"
+serde_json = "1.0.68"
diff --git a/primitives/runtime/Cargo.toml b/primitives/runtime/Cargo.toml
index ad4b0477184e8..017c6a75efd99 100644
--- a/primitives/runtime/Cargo.toml
+++ b/primitives/runtime/Cargo.toml
@@ -31,7 +31,7 @@ hash256-std-hasher = { version = "0.15.2", default-features = false }
 either = { version = "1.5", default-features = false }
 
 [dev-dependencies]
-serde_json = "1.0.41"
+serde_json = "1.0.68"
 rand = "0.7.2"
 sp-state-machine = { version = "0.10.0-dev", path = "../state-machine" }
 sp-api = { version = "4.0.0-dev", path = "../api" }
diff --git a/primitives/serializer/Cargo.toml b/primitives/serializer/Cargo.toml
index 8f03d8f972934..2200274e0628d 100644
--- a/primitives/serializer/Cargo.toml
+++ b/primitives/serializer/Cargo.toml
@@ -15,4 +15,4 @@ targets = ["x86_64-unknown-linux-gnu"]
 
 [dependencies]
 serde = "1.0.126"
-serde_json = "1.0.41"
+serde_json = "1.0.68"
diff --git a/primitives/tracing/Cargo.toml b/primitives/tracing/Cargo.toml
index aba918c9c5532..3be09dcd576df 100644
--- a/primitives/tracing/Cargo.toml
+++ b/primitives/tracing/Cargo.toml
@@ -31,7 +31,7 @@ tracing-subscriber = { version = "0.2.19", optional = true, features = [
 parking_lot = { version = "0.10.0", optional = true }
 erased-serde = { version = "0.3.9", optional = true }
 serde = { version = "1.0.126", optional = true }
-serde_json = { version = "1.0.41", optional = true }
+serde_json = { version = "1.0.68", optional = true }
 slog = { version = "2.5.2", features = ["nested-values"], optional = true }
 
 [features]
diff --git a/test-utils/client/Cargo.toml b/test-utils/client/Cargo.toml
index a6f152edafaa2..34238872cad84 100644
--- a/test-utils/client/Cargo.toml
+++ b/test-utils/client/Cargo.toml
@@ -16,7 +16,7 @@ codec = { package = "parity-scale-codec", version = "2.0.0" }
 futures = "0.3.16"
 hex = "0.4"
 serde = "1.0.126"
-serde_json = "1.0.55"
+serde_json = "1.0.68"
 sc-client-api = { version = "4.0.0-dev", path = "../../client/api" }
 sc-client-db = { version = "0.10.0-dev", features = [
     "test-helpers",