diff --git a/polkadot/Cargo.lock b/polkadot/Cargo.lock
index 61953d91e7..845c58b4bf 100644
--- a/polkadot/Cargo.lock
+++ b/polkadot/Cargo.lock
@@ -1778,6 +1778,18 @@ dependencies = [
  "sp-api",
 ]
 
+[[package]]
+name = "frame-try-runtime"
+version = "0.9.0"
+source = "git+https://github.com/paritytech/substrate?branch=master#904495bc14eff5171fca5912247e772948439411"
+dependencies = [
+ "frame-support",
+ "parity-scale-codec",
+ "sp-api",
+ "sp-runtime",
+ "sp-std",
+]
+
 [[package]]
 name = "fs-swap"
 version = "0.2.5"
@@ -2634,6 +2646,7 @@ checksum = "489b9c612e60c766f751ab40fcb43cbb55a1e10bb44a9b4307ed510ca598cbd7"
 dependencies = [
  "failure",
  "futures 0.1.29",
+ "hyper 0.12.35",
  "jsonrpc-core",
  "jsonrpc-pubsub",
  "log",
@@ -2775,6 +2788,7 @@ dependencies = [
  "frame-system",
  "frame-system-benchmarking",
  "frame-system-rpc-runtime-api",
+ "frame-try-runtime",
  "hex-literal",
  "libsecp256k1",
  "log",
@@ -5137,6 +5151,7 @@ dependencies = [
  "substrate-build-script-utils",
  "thiserror",
  "tracing-futures",
+ "try-runtime-cli",
  "wasm-bindgen",
  "wasm-bindgen-futures",
 ]
@@ -5709,6 +5724,7 @@ dependencies = [
  "frame-system",
  "frame-system-benchmarking",
  "frame-system-rpc-runtime-api",
+ "frame-try-runtime",
  "hex-literal",
  "libsecp256k1",
  "log",
@@ -6714,6 +6730,24 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "remote-externalities"
+version = "0.9.0"
+source = "git+https://github.com/paritytech/substrate?branch=master#904495bc14eff5171fca5912247e772948439411"
+dependencies = [
+ "bincode",
+ "env_logger 0.8.2",
+ "futures 0.1.29",
+ "hex-literal",
+ "jsonrpc-core-client",
+ "log",
+ "sc-rpc",
+ "sc-rpc-api",
+ "sp-core",
+ "sp-io",
+ "tokio 0.1.22",
+]
+
 [[package]]
 name = "remove_dir_all"
 version = "0.5.3"
@@ -9834,6 +9868,28 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e604eb7b43c06650e854be16a2a03155743d3752dd1c943f6829e26b7a36e382"
 
+[[package]]
+name = "try-runtime-cli"
+version = "0.9.0"
+source = "git+https://github.com/paritytech/substrate?branch=master#904495bc14eff5171fca5912247e772948439411"
+dependencies = [
+ "frame-try-runtime",
+ "log",
+ "parity-scale-codec",
+ "remote-externalities",
+ "sc-cli",
+ "sc-client-api",
+ "sc-executor",
+ "sc-service",
+ "sp-api",
+ "sp-blockchain",
+ "sp-core",
+ "sp-externalities",
+ "sp-runtime",
+ "sp-state-machine",
+ "structopt",
+]
+
 [[package]]
 name = "twox-hash"
 version = "1.5.0"
@@ -10447,6 +10503,7 @@ dependencies = [
  "frame-system",
  "frame-system-benchmarking",
  "frame-system-rpc-runtime-api",
+ "frame-try-runtime",
  "hex-literal",
  "libsecp256k1",
  "log",
diff --git a/polkadot/Cargo.toml b/polkadot/Cargo.toml
index 6fd9162ff1..e073800c83 100644
--- a/polkadot/Cargo.toml
+++ b/polkadot/Cargo.toml
@@ -92,6 +92,7 @@ panic = "unwind"
 runtime-benchmarks=["cli/runtime-benchmarks"]
 real-overseer=["cli/real-overseer"]
 approval-checking=["real-overseer", "service/approval-checking"]
+try-runtime = ["cli/try-runtime"]
 
 # Configuration for building a .deb package - for use with `cargo-deb`
 [package.metadata.deb]
diff --git a/polkadot/cli/Cargo.toml b/polkadot/cli/Cargo.toml
index 4e29c3dc85..ad4a22b59a 100644
--- a/polkadot/cli/Cargo.toml
+++ b/polkadot/cli/Cargo.toml
@@ -27,6 +27,7 @@ polkadot-parachain = { path = "../parachain", optional = true }
 sp-core = { git = "https://github.com/paritytech/substrate", branch = "master" }
 tracing-futures = "0.2.4"
 frame-benchmarking-cli = { git = "https://github.com/paritytech/substrate", branch = "master", optional = true }
+try-runtime-cli = { git = "https://github.com/paritytech/substrate", branch = "master", optional = true }
 sc-cli = { git = "https://github.com/paritytech/substrate", branch = "master", optional = true }
 sc-service = { git = "https://github.com/paritytech/substrate", branch = "master", optional = true }
 browser-utils = { package = "substrate-browser-utils", git = "https://github.com/paritytech/substrate", branch = "master", optional = true }
@@ -47,6 +48,7 @@ cli = [
 	"sc-cli",
 	"sc-service",
 	"frame-benchmarking-cli",
+	"try-runtime-cli",
 ]
 browser = [
 	"wasm-bindgen",
@@ -58,3 +60,4 @@ runtime-benchmarks = [ "service/runtime-benchmarks" ]
 trie-memory-tracker = [ "sp-trie/memory-tracker" ]
 full-node = [ "service/full-node" ]
 real-overseer = [ "service/real-overseer" ]
+try-runtime = [ "service/try-runtime" ]
diff --git a/polkadot/cli/src/cli.rs b/polkadot/cli/src/cli.rs
index c7520eee12..2dd56bc1ad 100644
--- a/polkadot/cli/src/cli.rs
+++ b/polkadot/cli/src/cli.rs
@@ -46,13 +46,17 @@ pub enum Subcommand {
 	#[structopt(name = "validation-worker", setting = structopt::clap::AppSettings::Hidden)]
 	ValidationWorker(ValidationWorkerCommand),
 
-	/// The custom benchmark subcommmand benchmarking runtime pallets.
+	/// The custom benchmark subcommand benchmarking runtime pallets.
 	#[structopt(
 		name = "benchmark",
 		about = "Benchmark runtime pallets."
 	)]
 	Benchmark(frame_benchmarking_cli::BenchmarkCmd),
 
+	/// Testing subcommand for runtime testing and trying.
+	#[cfg(feature = "try-runtime")]
+	TryRuntime(try_runtime_cli::TryRuntimeCmd),
+
 	/// Key management cli utilities
 	Key(sc_cli::KeySubcommand),
 }
diff --git a/polkadot/cli/src/command.rs b/polkadot/cli/src/command.rs
index 8b7e135fff..cb9e1bba2f 100644
--- a/polkadot/cli/src/command.rs
+++ b/polkadot/cli/src/command.rs
@@ -245,7 +245,7 @@ pub fn run() -> Result<()> {
 
 			Ok(runner.async_run(|mut config| {
 				let (client, backend, _, task_manager) = service::new_chain_ops(&mut config, None)?;
-				Ok((cmd.run(client, backend).map_err(Error::SubstrateCli),task_manager))
+				Ok((cmd.run(client, backend).map_err(Error::SubstrateCli), task_manager))
 			})?)
 		},
 		Some(Subcommand::ValidationWorker(cmd)) => {
@@ -276,6 +276,31 @@ pub fn run() -> Result<()> {
 			})?)
 		},
 		Some(Subcommand::Key(cmd)) => Ok(cmd.run(&cli)?),
+		#[cfg(feature = "try-runtime")]
+		Some(Subcommand::TryRuntime(cmd)) => {
+			let runner = cli.create_runner(cmd)?;
+			let chain_spec = &runner.config().chain_spec;
+			set_default_ss58_version(chain_spec);
+
+			runner.async_run(|config| {
+				use sc_service::TaskManager;
+				let registry = config.prometheus_config.as_ref().map(|cfg| &cfg.registry);
+				let task_manager = TaskManager::new(
+					config.task_executor.clone(),
+					registry,
+				).map_err(|e| Error::SubstrateService(sc_service::Error::Prometheus(e)))?;
+
+				Ok((
+					cmd.run::<
+						service::kusama_runtime::Block,
+						service::KusamaExecutor,
+					>(config).map_err(Error::SubstrateCli),
+					task_manager
+				))
+				// NOTE: we fetch only the block number from the block type, the chance of disparity
+				// between kusama's and polkadot's block number is small enough to overlook this.
+			})
+		}
 	}?;
 	Ok(())
 }
diff --git a/polkadot/node/service/Cargo.toml b/polkadot/node/service/Cargo.toml
index 47c2928462..9022f483c4 100644
--- a/polkadot/node/service/Cargo.toml
+++ b/polkadot/node/service/Cargo.toml
@@ -117,6 +117,11 @@ runtime-benchmarks = [
 	"westend-runtime/runtime-benchmarks",
 	"rococo-runtime/runtime-benchmarks"
 ]
+try-runtime = [
+	"polkadot-runtime/try-runtime",
+	"kusama-runtime/try-runtime",
+	"westend-runtime/try-runtime",
+]
 
 real-overseer = [
 	"polkadot-availability-bitfield-distribution",
diff --git a/polkadot/runtime/kusama/Cargo.toml b/polkadot/runtime/kusama/Cargo.toml
index f4660b6b3a..1637b773dc 100644
--- a/polkadot/runtime/kusama/Cargo.toml
+++ b/polkadot/runtime/kusama/Cargo.toml
@@ -58,7 +58,7 @@ pallet-session = { git = "https://github.com/paritytech/substrate", branch = "ma
 pallet-society = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 frame-support = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 pallet-staking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
-pallet-staking-reward-curve = { package = "pallet-staking-reward-curve", git = "https://github.com/paritytech/substrate", branch = "master" }
+pallet-staking-reward-curve = { git = "https://github.com/paritytech/substrate", branch = "master" }
 frame-system = {git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 frame-system-rpc-runtime-api = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 pallet-timestamp = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
@@ -68,6 +68,7 @@ pallet-utility = { git = "https://github.com/paritytech/substrate", branch = "ma
 pallet-vesting = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 
 frame-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
+frame-try-runtime = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
 pallet-offences-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
 pallet-session-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
 frame-system-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
@@ -182,7 +183,10 @@ runtime-benchmarks = [
 	"frame-system-benchmarking",
 	"hex-literal",
 ]
-
+try-runtime = [
+	"frame-executive/try-runtime",
+	"frame-try-runtime",
+]
 # When enabled, the runtime api will not be build.
 #
 # This is required by Cumulus to access certain types of the
diff --git a/polkadot/runtime/kusama/src/lib.rs b/polkadot/runtime/kusama/src/lib.rs
index 639d6a9a9d..ff1a1c3ad6 100644
--- a/polkadot/runtime/kusama/src/lib.rs
+++ b/polkadot/runtime/kusama/src/lib.rs
@@ -1067,7 +1067,6 @@ pub type Executive = frame_executive::Executive<
 	frame_system::ChainContext<Runtime>,
 	Runtime,
 	AllModules,
-	()
 >;
 /// The payload being signed in the transactions.
 pub type SignedPayload = generic::SignedPayload<Call, SignedExtra>;
@@ -1316,6 +1315,15 @@ sp_api::impl_runtime_apis! {
 		}
 	}
 
+	#[cfg(feature = "try-runtime")]
+	impl frame_try_runtime::TryRuntime<Block> for Runtime {
+		fn on_runtime_upgrade() -> Result<(Weight, Weight), sp_runtime::RuntimeString> {
+			frame_support::debug::RuntimeLogger::init();
+			let weight = Executive::try_runtime_upgrade()?;
+			Ok((weight, BlockWeights::get().max_block))
+		}
+	}
+
 	#[cfg(feature = "runtime-benchmarks")]
 	impl frame_benchmarking::Benchmark<Block> for Runtime {
 		fn dispatch_benchmark(
diff --git a/polkadot/runtime/polkadot/Cargo.toml b/polkadot/runtime/polkadot/Cargo.toml
index ad4049acd4..2660f448d1 100644
--- a/polkadot/runtime/polkadot/Cargo.toml
+++ b/polkadot/runtime/polkadot/Cargo.toml
@@ -66,6 +66,7 @@ pallet-vesting = { git = "https://github.com/paritytech/substrate", branch = "ma
 pallet-utility = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 
 frame-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
+frame-try-runtime = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
 frame-system-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
 pallet-offences-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
 pallet-session-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
@@ -177,7 +178,10 @@ runtime-benchmarks = [
 	"frame-system-benchmarking",
 	"hex-literal",
 ]
-
+try-runtime = [
+	"frame-executive/try-runtime",
+	"frame-try-runtime",
+]
 # When enabled, the runtime api will not be build.
 #
 # This is required by Cumulus to access certain types of the
diff --git a/polkadot/runtime/polkadot/src/lib.rs b/polkadot/runtime/polkadot/src/lib.rs
index 5c66a23dc6..83502543a2 100644
--- a/polkadot/runtime/polkadot/src/lib.rs
+++ b/polkadot/runtime/polkadot/src/lib.rs
@@ -1311,6 +1311,15 @@ sp_api::impl_runtime_apis! {
 		}
 	}
 
+	#[cfg(feature = "try-runtime")]
+	impl frame_try_runtime::TryRuntime<Block> for Runtime {
+		fn on_runtime_upgrade() -> Result<(Weight, Weight), sp_runtime::RuntimeString> {
+			frame_support::debug::RuntimeLogger::init();
+			let weight = Executive::try_runtime_upgrade()?;
+			Ok((weight, BlockWeights::get().max_block))
+		}
+	}
+
 	#[cfg(feature = "runtime-benchmarks")]
 	impl frame_benchmarking::Benchmark<Block> for Runtime {
 		fn dispatch_benchmark(
diff --git a/polkadot/runtime/westend/Cargo.toml b/polkadot/runtime/westend/Cargo.toml
index 992b235c5e..cc1b4a359a 100644
--- a/polkadot/runtime/westend/Cargo.toml
+++ b/polkadot/runtime/westend/Cargo.toml
@@ -67,6 +67,7 @@ pallet-utility = { git = "https://github.com/paritytech/substrate", branch = "ma
 pallet-vesting = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 
 frame-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
+frame-try-runtime = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
 frame-system-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
 pallet-offences-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
 pallet-session-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
@@ -179,7 +180,10 @@ runtime-benchmarks = [
 	"frame-system-benchmarking",
 	"hex-literal",
 ]
-
+try-runtime = [
+	"frame-executive/try-runtime",
+	"frame-try-runtime",
+]
 # When enabled, the runtime api will not be build.
 #
 # This is required by Cumulus to access certain types of the
diff --git a/polkadot/runtime/westend/src/lib.rs b/polkadot/runtime/westend/src/lib.rs
index c6f43a598a..cd503410c8 100644
--- a/polkadot/runtime/westend/src/lib.rs
+++ b/polkadot/runtime/westend/src/lib.rs
@@ -774,7 +774,6 @@ pub type Executive = frame_executive::Executive<
 	frame_system::ChainContext<Runtime>,
 	Runtime,
 	AllModules,
-	()
 >;
 /// The payload being signed in transactions.
 pub type SignedPayload = generic::SignedPayload<Call, SignedExtra>;
@@ -1031,6 +1030,15 @@ sp_api::impl_runtime_apis! {
 		}
 	}
 
+	#[cfg(feature = "try-runtime")]
+	impl frame_try_runtime::TryRuntime<Block> for Runtime {
+		fn on_runtime_upgrade() -> Result<(Weight, Weight), sp_runtime::RuntimeString> {
+			frame_support::debug::RuntimeLogger::init();
+			let weight = Executive::try_runtime_upgrade()?;
+			Ok((weight, BlockWeights::get().max_block))
+		}
+	}
+
 	#[cfg(feature = "runtime-benchmarks")]
 	impl frame_benchmarking::Benchmark<Block> for Runtime {
 		fn dispatch_benchmark(