diff --git a/bridges/primitives/chain-rococo/src/lib.rs b/bridges/primitives/chain-rococo/src/lib.rs
index cc3eb47b1b..b79fdf6cfc 100644
--- a/bridges/primitives/chain-rococo/src/lib.rs
+++ b/bridges/primitives/chain-rococo/src/lib.rs
@@ -32,14 +32,15 @@ pub type Rococo = PolkadotLike;
 
 pub type UncheckedExtrinsic = bp_polkadot_core::UncheckedExtrinsic<Call>;
 
+// NOTE: This needs to be kept up to date with the Rococo runtime found in the Polkadot repo.
 pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: sp_version::create_runtime_str!("rococo"),
-	impl_name: sp_version::create_runtime_str!("parity-rococo-v1-1"),
+	impl_name: sp_version::create_runtime_str!("parity-rococo-v1.5"),
 	authoring_version: 0,
-	spec_version: 30,
+	spec_version: 231,
 	impl_version: 0,
 	apis: sp_version::create_apis_vec![[]],
-	transaction_version: 6,
+	transaction_version: 0,
 };
 
 /// Rococo Runtime `Call` enum.
diff --git a/bridges/primitives/chain-westend/src/lib.rs b/bridges/primitives/chain-westend/src/lib.rs
index dbbfabd5dc..db97364ef4 100644
--- a/bridges/primitives/chain-westend/src/lib.rs
+++ b/bridges/primitives/chain-westend/src/lib.rs
@@ -32,12 +32,12 @@ pub type Westend = PolkadotLike;
 
 pub type UncheckedExtrinsic = bp_polkadot_core::UncheckedExtrinsic<Call>;
 
-/// Runtime version.
+// NOTE: This needs to be kept up to date with the Westend runtime found in the Polkadot repo.
 pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: sp_version::create_runtime_str!("westend"),
 	impl_name: sp_version::create_runtime_str!("parity-westend"),
 	authoring_version: 2,
-	spec_version: 50,
+	spec_version: 51,
 	impl_version: 0,
 	apis: sp_version::create_apis_vec![[]],
 	transaction_version: 5,