diff --git a/substrate/Cargo.lock b/substrate/Cargo.lock
index 6eb7efb084..a45e0accd4 100644
--- a/substrate/Cargo.lock
+++ b/substrate/Cargo.lock
@@ -7632,7 +7632,7 @@ dependencies = [
  "libp2p",
  "log 0.4.14",
  "parity-scale-codec",
- "prost 0.8.0",
+ "prost 0.9.0",
  "prost-build 0.9.0",
  "quickcheck",
  "rand 0.7.3",
@@ -8282,7 +8282,7 @@ dependencies = [
  "parity-scale-codec",
  "parking_lot 0.11.1",
  "pin-project 1.0.8",
- "prost 0.8.0",
+ "prost 0.9.0",
  "prost-build 0.9.0",
  "quickcheck",
  "rand 0.7.3",
diff --git a/substrate/client/authority-discovery/Cargo.toml b/substrate/client/authority-discovery/Cargo.toml
index fff1ed08a8..b6f9b8450d 100644
--- a/substrate/client/authority-discovery/Cargo.toml
+++ b/substrate/client/authority-discovery/Cargo.toml
@@ -26,7 +26,7 @@ ip_network = "0.4.0"
 libp2p = { version = "0.39.1", default-features = false, features = ["kad"] }
 log = "0.4.8"
 prometheus-endpoint = { package = "substrate-prometheus-endpoint", path = "../../utils/prometheus", version = "0.10.0-dev" }
-prost = "0.8"
+prost = "0.9"
 rand = "0.7.2"
 sc-client-api = { version = "4.0.0-dev", path = "../api" }
 sc-network = { version = "0.10.0-dev", path = "../network" }
diff --git a/substrate/client/network/Cargo.toml b/substrate/client/network/Cargo.toml
index c4622c0c5d..527a18dc77 100644
--- a/substrate/client/network/Cargo.toml
+++ b/substrate/client/network/Cargo.toml
@@ -41,7 +41,7 @@ log = "0.4.8"
 parking_lot = "0.11.1"
 pin-project = "1.0.8"
 prometheus-endpoint = { package = "substrate-prometheus-endpoint", version = "0.10.0-dev", path = "../../utils/prometheus" }
-prost = "0.8"
+prost = "0.9"
 rand = "0.7.2"
 sc-block-builder = { version = "0.10.0-dev", path = "../block-builder" }
 sc-client-api = { version = "4.0.0-dev", path = "../api" }