diff --git a/Cargo.lock b/Cargo.lock
index 111007321..13e9bc51f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -38,7 +38,7 @@ dependencies = [
  "rpassword 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "semver 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "semver 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.8.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -318,7 +318,7 @@ dependencies = [
  "rlp 0.1.0",
  "rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "semver 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "semver 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
  "transient-hashmap 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -408,7 +408,7 @@ dependencies = [
  "ethcore-devtools 1.5.0",
  "ethcore-util 1.5.0",
  "nanomsg 0.5.1 (git+https://github.com/ethcore/nanomsg.rs.git)",
- "semver 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "semver 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -431,7 +431,7 @@ dependencies = [
  "ethcore-ipc-nano 1.5.0",
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "nanomsg 0.5.1 (git+https://github.com/ethcore/nanomsg.rs.git)",
- "semver 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "semver 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -456,7 +456,7 @@ dependencies = [
  "ethcore-util 1.5.0",
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "nanomsg 0.5.1 (git+https://github.com/ethcore/nanomsg.rs.git)",
- "semver 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "semver 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -576,7 +576,7 @@ dependencies = [
  "lazy_static 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.5.1 (git+https://github.com/ethcore/mio?branch=v0.5.x)",
- "semver 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "semver 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -693,7 +693,7 @@ dependencies = [
  "parking_lot 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.1.0",
- "semver 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "semver 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index b4020f198..beab07177 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@ time = "0.1"
 num_cpus = "0.2"
 number_prefix = "0.2"
 rpassword = "0.2.1"
-semver = "0.2"
+semver = "0.5"
 ansi_term = "0.7"
 lazy_static = "0.2"
 regex = "0.1"
diff --git a/db/Cargo.toml b/db/Cargo.toml
index 9642ed882..2a327e5e3 100644
--- a/db/Cargo.toml
+++ b/db/Cargo.toml
@@ -15,7 +15,7 @@ clippy = { version = "0.0.103", optional = true}
 ethcore-devtools = { path = "../devtools" }
 ethcore-ipc = { path = "../ipc/rpc" }
 rocksdb = { git = "https://github.com/ethcore/rust-rocksdb" }
-semver = "0.2"
+semver = "0.5"
 ethcore-ipc-nano = { path = "../ipc/nano" }
 nanomsg = { git = "https://github.com/ethcore/nanomsg.rs.git" }
 crossbeam = "0.2"
diff --git a/ethcore/Cargo.toml b/ethcore/Cargo.toml
index 17c5d3a04..c68239529 100644
--- a/ethcore/Cargo.toml
+++ b/ethcore/Cargo.toml
@@ -21,7 +21,7 @@ crossbeam = "0.2.9"
 lazy_static = "0.2"
 bloomchain = "0.1"
 rayon = "0.4.2"
-semver = "0.2"
+semver = "0.5"
 bit-set = "0.4"
 time = "0.1"
 rand = "0.3"
diff --git a/ipc/hypervisor/Cargo.toml b/ipc/hypervisor/Cargo.toml
index d730b9bcf..cd0fb4561 100644
--- a/ipc/hypervisor/Cargo.toml
+++ b/ipc/hypervisor/Cargo.toml
@@ -11,7 +11,7 @@ build = "build.rs"
 ethcore-ipc = { path = "../rpc" }
 nanomsg = { git = "https://github.com/ethcore/nanomsg.rs.git" }
 ethcore-ipc-nano = { path = "../nano" }
-semver = "0.2"
+semver = "0.5"
 log = "0.3"
 time = "0.1"
 
diff --git a/ipc/rpc/Cargo.toml b/ipc/rpc/Cargo.toml
index 1aecb3292..f9d390547 100644
--- a/ipc/rpc/Cargo.toml
+++ b/ipc/rpc/Cargo.toml
@@ -10,4 +10,4 @@ license = "GPL-3.0"
 ethcore-devtools = { path = "../../devtools" }
 nanomsg = { git = "https://github.com/ethcore/nanomsg.rs.git" }
 ethcore-util = { path = "../../util" }
-semver = "0.2"
+semver = "0.5"
diff --git a/ipc/tests/Cargo.toml b/ipc/tests/Cargo.toml
index 23bde87e2..7f10edaa7 100644
--- a/ipc/tests/Cargo.toml
+++ b/ipc/tests/Cargo.toml
@@ -10,7 +10,7 @@ path = "run.rs"
 [dependencies]
 ethcore-ipc = { path = "../rpc" }
 ethcore-devtools = { path = "../../devtools" }
-semver = "0.2"
+semver = "0.5"
 nanomsg = { git = "https://github.com/ethcore/nanomsg.rs.git" }
 ethcore-ipc-nano = { path = "../nano" }
 ethcore-util = { path = "../../util" }
diff --git a/stratum/Cargo.toml b/stratum/Cargo.toml
index 609f4ee9b..f3ff1bc8e 100644
--- a/stratum/Cargo.toml
+++ b/stratum/Cargo.toml
@@ -19,7 +19,7 @@ ethcore-devtools = { path = "../devtools" }
 lazy_static = "0.2"
 env_logger = "0.3"
 ethcore-ipc = { path = "../ipc/rpc" }
-semver = "0.2"
+semver = "0.5"
 ethcore-ipc-nano = { path = "../ipc/nano" }
 
 [profile.release]
diff --git a/sync/Cargo.toml b/sync/Cargo.toml
index f4166bbe5..484d4bb17 100644
--- a/sync/Cargo.toml
+++ b/sync/Cargo.toml
@@ -25,7 +25,7 @@ time = "0.1.34"
 rand = "0.3.13"
 heapsize = "0.3"
 ethcore-ipc = { path = "../ipc/rpc" }
-semver = "0.2"
+semver = "0.5"
 ethcore-ipc-nano = { path = "../ipc/nano" }
 ethcore-devtools = { path = "../devtools" }
 ethkey = { path = "../ethkey" }