diff --git a/Cargo.lock b/Cargo.lock
index 72f2c9e25..8d85306aa 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -104,7 +104,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "crunchy 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc_version 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -773,7 +773,7 @@ dependencies = [
  "ethbloom 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethereum-types-serialize 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "fixed-hash 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc_version 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.29 (registry+https://github.com/rust-lang/crates.io-index)",
  "uint 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -897,7 +897,7 @@ dependencies = [
  "plain_hasher 0.1.0",
  "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.2.1",
- "semver 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "triehash 0.1.0",
 ]
@@ -1923,8 +1923,8 @@ dependencies = [
  "rpassword 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rpc-cli 1.4.0",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc_version 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "semver 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.29 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.29 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2121,7 +2121,7 @@ dependencies = [
  "rlp 0.2.1",
  "rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "semver 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.29 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.29 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2175,7 +2175,7 @@ dependencies = [
  "parity-ui-old-dev 1.9.0 (git+https://github.com/parity-js/dapp-wallet.git?rev=65deb02e7c007a0fd8aab0c089c93e3fd1de6f87)",
  "parity-ui-old-precompiled 1.9.0 (git+https://github.com/js-dist-paritytech/parity-master-1-10-wallet.git?rev=4b6f112412716cd05123d32eeb7fda448288a6c6)",
  "parity-ui-precompiled 1.9.0 (git+https://github.com/js-dist-paritytech/parity-master-1-10-shell.git?rev=bd25b41cd642c6b822d820dded3aa601a29aa079)",
- "rustc_version 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2230,7 +2230,7 @@ dependencies = [
  "parking_lot 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "path 0.1.0",
  "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "semver 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "target_info 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2241,7 +2241,7 @@ version = "1.11.0"
 dependencies = [
  "ethcore-bytes 0.1.0",
  "rlp 0.2.1",
- "rustc_version 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "target_info 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "toml 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "vergen 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2764,10 +2764,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "rustc_version"
-version = "0.2.1"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "semver 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2809,7 +2809,7 @@ dependencies = [
 
 [[package]]
 name = "semver"
-version = "0.6.0"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3289,7 +3289,7 @@ dependencies = [
  "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc_version 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3759,13 +3759,13 @@ dependencies = [
 "checksum rustc-demangle 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "aee45432acc62f7b9a108cc054142dac51f979e69e71ddce7d6fc7adf29e817e"
 "checksum rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "0ceb8ce7a5e520de349e1fa172baeba4a9e8d5ef06c47471863530bc4972ee1e"
 "checksum rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)" = "dcf128d1287d2ea9d80910b5f1120d0b8eede3fbf1abe91c40d39ea7d51e6fda"
-"checksum rustc_version 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b9743a7670d88d5d52950408ecdb7c71d8986251ab604d4689dd2ca25c9bca69"
+"checksum rustc_version 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "a54aa04a10c68c1c4eacb4337fd883b435997ede17a9385784b990777686b09a"
 "checksum rustls 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "cc9f2e05fd6a3ce1530cd5dbcc553d2f94d7749fe3e4f5b443668eddd842889e"
 "checksum safemem 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e27a8b19b835f7aea908818e871f5cc3a5a186550c30773be987e155e8163d8f"
 "checksum scoped-tls 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f417c22df063e9450888a7561788e9bd46d3bb3c1466435b4eccb903807f147d"
 "checksum scopeguard 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c79eb2c3ac4bc2507cda80e7f3ac5b88bd8eae4c0914d5663e6a8933994be918"
 "checksum sct 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1137b767bbe1c4d30656993bdd97422ed41255d9400b105d735f8c7d9e800632"
-"checksum semver 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a3186ec9e65071a2095434b1f5bb24838d4e8e130f584c790f6033c79943537"
+"checksum semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
 "checksum semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
 "checksum serde 1.0.29 (registry+https://github.com/rust-lang/crates.io-index)" = "4763b773978e495252615e814d2ad04773b2c1f85421c7913869a537f35cb406"
 "checksum serde_derive 1.0.29 (registry+https://github.com/rust-lang/crates.io-index)" = "8ab31f00ae5574bb643c196d5e302961c122da1c768604c6d16a35c5d551948a"
diff --git a/Cargo.toml b/Cargo.toml
index f14b64fe8..d09b8a08f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,7 +17,7 @@ textwrap = "0.9"
 num_cpus = "1.2"
 number_prefix = "0.2"
 rpassword = "1.0"
-semver = "0.6"
+semver = "0.9"
 ansi_term = "0.10"
 parking_lot = "0.5"
 regex = "0.2"
diff --git a/parity/upgrade.rs b/parity/upgrade.rs
index fcea2560e..c5c2e1ed4 100644
--- a/parity/upgrade.rs
+++ b/parity/upgrade.rs
@@ -16,7 +16,7 @@
 
 //! Parity upgrade logic
 
-use semver::Version;
+use semver::{Version, SemVerError};
 use std::collections::*;
 use std::fs::{self, File, create_dir_all};
 use std::env;
@@ -32,6 +32,13 @@ pub enum Error {
 	CannotCreateConfigPath,
 	CannotWriteVersionFile,
 	CannotUpdateVersionFile,
+	SemVer(SemVerError),
+}
+
+impl From<SemVerError> for Error {
+	fn from(err: SemVerError) -> Self {
+		Error::SemVer(err)
+	}
 }
 
 const CURRENT_VERSION: &'static str = env!("CARGO_PKG_VERSION");
@@ -74,7 +81,7 @@ fn push_upgrades(upgrades: &mut UpgradeList)
 {
 	// dummy upgrade (remove when the first one is in)
 	upgrades.insert(
-		UpgradeKey { old_version: Version::parse("0.9.0").unwrap(), new_version: Version::parse("1.0.0").unwrap() },
+		UpgradeKey { old_version: Version::new(0, 9, 0), new_version: Version::new(1, 0, 0)},
 		dummy_upgrade);
 }
 
@@ -82,7 +89,7 @@ fn upgrade_from_version(previous_version: &Version) -> Result<usize, Error> {
 	let mut upgrades = HashMap::new();
 	push_upgrades(&mut upgrades);
 
-	let current_version = Version::parse(CURRENT_VERSION).unwrap();
+	let current_version = Version::parse(CURRENT_VERSION)?;
 
 	let mut count = 0;
 	for upgrade_key in upgrades.keys() {
@@ -114,12 +121,12 @@ fn with_locked_version<F>(db_path: Option<&str>, script: F) -> Result<usize, Err
 					.ok()
 					.and_then(|_| Version::parse(&version_string).ok())
 			})
-			.unwrap_or_else(|| Version::parse("0.9.0").unwrap());
+			.unwrap_or(Version::new(0, 9, 0));
 
 	let mut lock = File::create(&path).map_err(|_| Error::CannotWriteVersionFile)?;
 	let result = script(&version);
 
-	let written_version = Version::parse(CURRENT_VERSION).unwrap();
+	let written_version = Version::parse(CURRENT_VERSION)?;
 	lock.write_all(written_version.to_string().as_bytes()).map_err(|_| Error::CannotUpdateVersionFile)?;
 	result
 }
diff --git a/rpc/Cargo.toml b/rpc/Cargo.toml
index 433f46d13..51f2e8ff3 100644
--- a/rpc/Cargo.toml
+++ b/rpc/Cargo.toml
@@ -19,7 +19,7 @@ parking_lot = "0.5"
 rand = "0.4"
 rust-crypto = "0.2"
 rustc-hex = "1.0"
-semver = "0.6"
+semver = "0.9"
 serde = "1.0"
 serde_derive = "1.0"
 serde_json = "1.0"
diff --git a/sync/Cargo.toml b/sync/Cargo.toml
index 1c1bd467b..c5384de71 100644
--- a/sync/Cargo.toml
+++ b/sync/Cargo.toml
@@ -26,7 +26,7 @@ log = "0.3"
 env_logger = "0.4"
 rand = "0.4"
 heapsize = "0.4"
-semver = "0.6"
+semver = "0.9"
 smallvec = { version = "0.4", features = ["heapsizeof"] }
 parking_lot = "0.5"
 ipnetwork = "0.12.6"
diff --git a/updater/Cargo.toml b/updater/Cargo.toml
index 25f046a20..4afe802c6 100644
--- a/updater/Cargo.toml
+++ b/updater/Cargo.toml
@@ -13,7 +13,7 @@ ethabi = "5.1"
 ethabi-derive = "5.0"
 ethabi-contract = "5.0"
 target_info = "0.1"
-semver = "0.6"
+semver = "0.9"
 ethcore = { path = "../ethcore" }
 ethsync = { path = "../sync" }
 ethcore-bytes = { path = "../util/bytes" }
diff --git a/util/version/Cargo.toml b/util/version/Cargo.toml
index febed85c2..1cc0dc6d2 100644
--- a/util/version/Cargo.toml
+++ b/util/version/Cargo.toml
@@ -28,7 +28,7 @@ target_info = "0.1"
 
 [build-dependencies]
 vergen = "0.1"
-rustc_version = "0.2.0"
+rustc_version = "0.2"
 toml = "0.4"
 
 [features]