diff --git a/Cargo.lock b/Cargo.lock
index a6e44f1b586..3ebe6f4b909 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1899,7 +1899,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2617,7 +2617,7 @@ dependencies = [
 
 [[package]]
 name = "pwasm-utils"
-version = "0.2.2"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3747,7 +3747,7 @@ dependencies = [
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-wasm 0.31.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "pwasm-utils 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pwasm-utils 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "vm 0.1.0",
  "wasmi 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -4073,7 +4073,7 @@ dependencies = [
 "checksum proc-macro2 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)" = "ffe022fb8c8bd254524b0b3305906c1921fa37a84a644e29079a9e62200c3901"
 "checksum protobuf 1.7.4 (registry+https://github.com/rust-lang/crates.io-index)" = "52fbc45bf6709565e44ef31847eb7407b3c3c80af811ee884a04da071dcca12b"
 "checksum pulldown-cmark 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "8361e81576d2e02643b04950e487ec172b687180da65c731c03cf336784e6c07"
-"checksum pwasm-utils 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "90d2b3c5bf24275fc77db6b14ec00a7a085d8ff9d1c4215fb6f6263e8d7b01bc"
+"checksum pwasm-utils 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7e9135bed7b452e20dbb395a2d519abaf0c46d60e7ecc02daeeab447d29bada1"
 "checksum quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9274b940887ce9addde99c4eee6b5c44cc494b182b97e73dc8ffdcb3397fd3f0"
 "checksum quote 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1eca14c727ad12702eb4b6bfb5a232287dcf8385cb8ca83a3eeaf6519c44c408"
 "checksum quote 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9949cfe66888ffe1d53e6ec9d9f3b70714083854be20fd5e271b232a017401e8"
diff --git a/ethcore/wasm/Cargo.toml b/ethcore/wasm/Cargo.toml
index 93571be6275..c2bf6b29695 100644
--- a/ethcore/wasm/Cargo.toml
+++ b/ethcore/wasm/Cargo.toml
@@ -9,7 +9,7 @@ ethereum-types = "0.4"
 log = "0.4"
 parity-wasm = "0.31"
 libc = "0.2"
-pwasm-utils = "0.2.2"
+pwasm-utils = "0.6.1"
 vm = { path = "../vm" }
 ethcore-logger = { path = "../../logger" }
 wasmi = "0.3.0"