diff --git a/.travis.yml b/.travis.yml
index 5ecd71a3d418..3fca86022fb2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-  - "9"
+  - "10"
 cache:
   yarn: true
   directories:
diff --git a/package.json b/package.json
index 20deb600428a..96ff3b699b81 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,10 @@
 {
   "version": "0.13.5",
   "private": true,
+  "engines": {
+    "node": "^10.1.0",
+    "yarn": "^1.3.2"
+  },
   "workspaces": [
     "packages/*"
   ],
@@ -11,6 +15,6 @@
     "test": "jest --coverage"
   },
   "devDependencies": {
-    "@polkadot/dev": "^0.19.23"
+    "@polkadot/dev": "^0.19.24"
   }
 }
diff --git a/packages/api-format/package.json b/packages/api-format/package.json
index 91a2cc13a687..a3848c8211b3 100644
--- a/packages/api-format/package.json
+++ b/packages/api-format/package.json
@@ -31,9 +31,9 @@
   },
   "dependencies": {
     "@babel/runtime": "^7.0.0-beta.47",
-    "@polkadot/jsonrpc": "^0.17.21",
-    "@polkadot/primitives-json": "^0.17.21",
-    "@polkadot/util": "^0.22.7",
-    "@polkadot/util-keyring": "^0.22.7"
+    "@polkadot/jsonrpc": "^0.17.23",
+    "@polkadot/primitives-json": "^0.17.23",
+    "@polkadot/util": "^0.22.8",
+    "@polkadot/util-keyring": "^0.22.8"
   }
 }
diff --git a/packages/api-provider/package.json b/packages/api-provider/package.json
index 35cc4d5816d5..d8c716900bca 100644
--- a/packages/api-provider/package.json
+++ b/packages/api-provider/package.json
@@ -35,10 +35,10 @@
   },
   "dependencies": {
     "@babel/runtime": "^7.0.0-beta.47",
-    "@polkadot/storage": "^0.17.21",
-    "@polkadot/util": "^0.22.7",
-    "@polkadot/util-crypto": "^0.22.7",
-    "@polkadot/util-keyring": "^0.22.7",
+    "@polkadot/storage": "^0.17.23",
+    "@polkadot/util": "^0.22.8",
+    "@polkadot/util-crypto": "^0.22.8",
+    "@polkadot/util-keyring": "^0.22.8",
     "eventemitter3": "^2.0.3",
     "isomorphic-fetch": "^2.2.1",
     "websocket": "^1.0.25"
diff --git a/packages/api/package.json b/packages/api/package.json
index 87166689adc1..c44971e35ba1 100644
--- a/packages/api/package.json
+++ b/packages/api/package.json
@@ -33,8 +33,8 @@
     "@babel/runtime": "^7.0.0-beta.47",
     "@polkadot/api-format": "^0.13.5",
     "@polkadot/api-provider": "^0.13.5",
-    "@polkadot/jsonrpc": "^0.17.21",
-    "@polkadot/params": "^0.17.21",
-    "@polkadot/util": "^0.22.7"
+    "@polkadot/jsonrpc": "^0.17.23",
+    "@polkadot/params": "^0.17.23",
+    "@polkadot/util": "^0.22.8"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index 88e5787e4a9b..742e5ff3e288 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -664,9 +664,9 @@
     lodash "^4.17.5"
     to-fast-properties "^2.0.0"
 
-"@polkadot/dev@^0.19.23":
-  version "0.19.23"
-  resolved "https://registry.yarnpkg.com/@polkadot/dev/-/dev-0.19.23.tgz#cf00087f7d7fbaec47fe44afe3f1eaa6da14af13"
+"@polkadot/dev@^0.19.24":
+  version "0.19.24"
+  resolved "https://registry.yarnpkg.com/@polkadot/dev/-/dev-0.19.24.tgz#c9e97a3d9c019c1978d1db4ce0ec9c936ca36998"
   dependencies:
     "@babel/cli" "^7.0.0-beta.47"
     "@babel/core" "^7.0.0-beta.47"
@@ -700,53 +700,53 @@
     mkdirp "^0.5.1"
     rimraf "^2.6.2"
 
-"@polkadot/extrinsics-codec@^0.17.21":
-  version "0.17.21"
-  resolved "https://registry.yarnpkg.com/@polkadot/extrinsics-codec/-/extrinsics-codec-0.17.21.tgz#1fec1186a7a067159dd5c829e6da536956c799fe"
+"@polkadot/extrinsics-codec@^0.17.23":
+  version "0.17.23"
+  resolved "https://registry.yarnpkg.com/@polkadot/extrinsics-codec/-/extrinsics-codec-0.17.23.tgz#9d03c3e0643801eb340040ba3d18d53f31421cd3"
   dependencies:
     "@babel/runtime" "^7.0.0-beta.47"
-    "@polkadot/extrinsics" "^0.17.21"
-    "@polkadot/params" "^0.17.21"
-    "@polkadot/util" "^0.22.7"
-    "@polkadot/util-keyring" "^0.22.7"
+    "@polkadot/extrinsics" "^0.17.23"
+    "@polkadot/params" "^0.17.23"
+    "@polkadot/util" "^0.22.8"
+    "@polkadot/util-keyring" "^0.22.8"
     bn.js "^4.11.8"
 
-"@polkadot/extrinsics@^0.17.21":
-  version "0.17.21"
-  resolved "https://registry.yarnpkg.com/@polkadot/extrinsics/-/extrinsics-0.17.21.tgz#fb2cea28ad045bfc1079bd00e1c05ef0f0c31e5a"
+"@polkadot/extrinsics@^0.17.23":
+  version "0.17.23"
+  resolved "https://registry.yarnpkg.com/@polkadot/extrinsics/-/extrinsics-0.17.23.tgz#31166779780708eb3bd43da9f113cabef249f7f5"
   dependencies:
     "@babel/runtime" "^7.0.0-beta.47"
-    "@polkadot/params" "^0.17.21"
-    "@polkadot/primitives" "^0.17.21"
-    "@polkadot/util" "^0.22.7"
+    "@polkadot/params" "^0.17.23"
+    "@polkadot/primitives" "^0.17.23"
+    "@polkadot/util" "^0.22.8"
 
-"@polkadot/jsonrpc@^0.17.21":
-  version "0.17.21"
-  resolved "https://registry.yarnpkg.com/@polkadot/jsonrpc/-/jsonrpc-0.17.21.tgz#9594e2b9ab8537ed7a3a0b9d5a194816d8d8e627"
+"@polkadot/jsonrpc@^0.17.23":
+  version "0.17.23"
+  resolved "https://registry.yarnpkg.com/@polkadot/jsonrpc/-/jsonrpc-0.17.23.tgz#deba4f92df4272b06dad630826312f5e34a377be"
   dependencies:
-    "@polkadot/params" "^0.17.21"
+    "@polkadot/params" "^0.17.23"
     babel-runtime "^6.26.0"
 
-"@polkadot/params@^0.17.21":
-  version "0.17.21"
-  resolved "https://registry.yarnpkg.com/@polkadot/params/-/params-0.17.21.tgz#aee1a39859728ce90e0362963fe68e86dcb6b587"
+"@polkadot/params@^0.17.23":
+  version "0.17.23"
+  resolved "https://registry.yarnpkg.com/@polkadot/params/-/params-0.17.23.tgz#db9f9585948c6a1de80ce1dca0d08f0ae7f63f3a"
   dependencies:
     "@babel/runtime" "^7.0.0-beta.47"
-    "@polkadot/extrinsics" "^0.17.21"
-    "@polkadot/primitives" "^0.17.21"
-    "@polkadot/util" "^0.22.7"
+    "@polkadot/extrinsics" "^0.17.23"
+    "@polkadot/primitives" "^0.17.23"
+    "@polkadot/util" "^0.22.8"
 
-"@polkadot/primitives-builder@^0.17.21":
-  version "0.17.21"
-  resolved "https://registry.yarnpkg.com/@polkadot/primitives-builder/-/primitives-builder-0.17.21.tgz#f15a32ec16aae133eaaf26a554224504aa5683ef"
+"@polkadot/primitives-builder@^0.17.23":
+  version "0.17.23"
+  resolved "https://registry.yarnpkg.com/@polkadot/primitives-builder/-/primitives-builder-0.17.23.tgz#e5bda76f24ac5107988c68964b5df316c15a6ab7"
   dependencies:
     "@babel/runtime" "^7.0.0-beta.47"
-    "@polkadot/extrinsics-codec" "^0.17.21"
-    "@polkadot/primitives" "^0.17.21"
-    "@polkadot/primitives-codec" "^0.17.21"
-    "@polkadot/util" "^0.22.7"
-    "@polkadot/util-crypto" "^0.22.7"
-    "@polkadot/util-triehash" "^0.22.7"
+    "@polkadot/extrinsics-codec" "^0.17.23"
+    "@polkadot/primitives" "^0.17.23"
+    "@polkadot/primitives-codec" "^0.17.23"
+    "@polkadot/util" "^0.22.8"
+    "@polkadot/util-crypto" "^0.22.8"
+    "@polkadot/util-triehash" "^0.22.8"
 
 "@polkadot/primitives-builder@^0.17.9":
   version "0.17.9"
@@ -759,16 +759,16 @@
     "@polkadot/util-crypto" "^0.22.2"
     "@polkadot/util-triehash" "^0.22.2"
 
-"@polkadot/primitives-codec@^0.17.21":
-  version "0.17.21"
-  resolved "https://registry.yarnpkg.com/@polkadot/primitives-codec/-/primitives-codec-0.17.21.tgz#0e1bc0a8c83d80eb9d486a1b0877bb304d372b3a"
+"@polkadot/primitives-codec@^0.17.23":
+  version "0.17.23"
+  resolved "https://registry.yarnpkg.com/@polkadot/primitives-codec/-/primitives-codec-0.17.23.tgz#8ecf102eb805ebde7bda194209edc230ec592246"
   dependencies:
     "@babel/runtime" "^7.0.0-beta.47"
-    "@polkadot/primitives" "^0.17.21"
-    "@polkadot/primitives-builder" "^0.17.21"
+    "@polkadot/primitives" "^0.17.23"
+    "@polkadot/primitives-builder" "^0.17.23"
     "@polkadot/primitives-rlp" "^0.17.9"
-    "@polkadot/util" "^0.22.7"
-    "@polkadot/util-keyring" "^0.22.7"
+    "@polkadot/util" "^0.22.8"
+    "@polkadot/util-keyring" "^0.22.8"
 
 "@polkadot/primitives-codec@^0.17.9":
   version "0.17.9"
@@ -781,14 +781,14 @@
     "@polkadot/util" "^0.22.2"
     "@polkadot/util-keyring" "^0.22.2"
 
-"@polkadot/primitives-json@^0.17.21":
-  version "0.17.21"
-  resolved "https://registry.yarnpkg.com/@polkadot/primitives-json/-/primitives-json-0.17.21.tgz#97939c81f292807b4129d9e6d1ce390f8ab39a5d"
+"@polkadot/primitives-json@^0.17.23":
+  version "0.17.23"
+  resolved "https://registry.yarnpkg.com/@polkadot/primitives-json/-/primitives-json-0.17.23.tgz#6741780cc13d0c730952cad9d9dae283de5b05e2"
   dependencies:
     "@babel/runtime" "^7.0.0-beta.47"
-    "@polkadot/primitives" "^0.17.21"
-    "@polkadot/primitives-builder" "^0.17.21"
-    "@polkadot/util" "^0.22.7"
+    "@polkadot/primitives" "^0.17.23"
+    "@polkadot/primitives-builder" "^0.17.23"
+    "@polkadot/util" "^0.22.8"
 
 "@polkadot/primitives-rlp@^0.17.9":
   version "0.17.9"
@@ -800,12 +800,12 @@
     "@polkadot/util" "^0.22.2"
     "@polkadot/util-crypto" "^0.22.2"
 
-"@polkadot/primitives@^0.17.21":
-  version "0.17.21"
-  resolved "https://registry.yarnpkg.com/@polkadot/primitives/-/primitives-0.17.21.tgz#fd9e27121e1f88c503a40661081353b5a1b2aec3"
+"@polkadot/primitives@^0.17.23":
+  version "0.17.23"
+  resolved "https://registry.yarnpkg.com/@polkadot/primitives/-/primitives-0.17.23.tgz#e77d902af3dca58ff2c17725c8b4968180dcc279"
   dependencies:
     "@babel/runtime" "^7.0.0-beta.47"
-    "@polkadot/util" "^0.22.7"
+    "@polkadot/util" "^0.22.8"
 
 "@polkadot/primitives@^0.17.9":
   version "0.17.9"
@@ -814,15 +814,15 @@
     "@babel/runtime" "^7.0.0-beta.47"
     "@polkadot/util" "^0.22.2"
 
-"@polkadot/storage@^0.17.21":
-  version "0.17.21"
-  resolved "https://registry.yarnpkg.com/@polkadot/storage/-/storage-0.17.21.tgz#f4a9c9520b2da1a6fd131b95a8f210c9f4302cee"
+"@polkadot/storage@^0.17.23":
+  version "0.17.23"
+  resolved "https://registry.yarnpkg.com/@polkadot/storage/-/storage-0.17.23.tgz#221e9faa6d2feae034c878fc2d5af2fbecbc9e1d"
   dependencies:
     "@babel/runtime" "^7.0.0-beta.47"
-    "@polkadot/params" "^0.17.21"
-    "@polkadot/primitives" "^0.17.21"
-    "@polkadot/util" "^0.22.7"
-    "@polkadot/util-keyring" "^0.22.7"
+    "@polkadot/params" "^0.17.23"
+    "@polkadot/primitives" "^0.17.23"
+    "@polkadot/util" "^0.22.8"
+    "@polkadot/util-keyring" "^0.22.8"
 
 "@polkadot/util-crypto@^0.22.2":
   version "0.22.2"
@@ -835,12 +835,12 @@
     tweetnacl "^1.0.0"
     xxhashjs "^0.2.2"
 
-"@polkadot/util-crypto@^0.22.7":
-  version "0.22.7"
-  resolved "https://registry.yarnpkg.com/@polkadot/util-crypto/-/util-crypto-0.22.7.tgz#66ce599638a32338f2447a3b17b0a33acc2fdb42"
+"@polkadot/util-crypto@^0.22.8":
+  version "0.22.8"
+  resolved "https://registry.yarnpkg.com/@polkadot/util-crypto/-/util-crypto-0.22.8.tgz#06e03ae833146a119d5825818b8edd99e9947ef9"
   dependencies:
     "@babel/runtime" "^7.0.0-beta.47"
-    "@polkadot/util" "^0.22.7"
+    "@polkadot/util" "^0.22.8"
     blakejs "^1.1.0"
     js-sha3 "^0.7.0"
     tweetnacl "^1.0.0"
@@ -855,13 +855,13 @@
     "@polkadot/util-crypto" "^0.22.2"
     bs58 "^4.0.1"
 
-"@polkadot/util-keyring@^0.22.7":
-  version "0.22.7"
-  resolved "https://registry.yarnpkg.com/@polkadot/util-keyring/-/util-keyring-0.22.7.tgz#111b3e0e6a25a14b5d9039c746c737509b512771"
+"@polkadot/util-keyring@^0.22.8":
+  version "0.22.8"
+  resolved "https://registry.yarnpkg.com/@polkadot/util-keyring/-/util-keyring-0.22.8.tgz#daa42630f624736d00f4975a034f4efe69cccbd1"
   dependencies:
     "@babel/runtime" "^7.0.0-beta.47"
-    "@polkadot/util" "^0.22.7"
-    "@polkadot/util-crypto" "^0.22.7"
+    "@polkadot/util" "^0.22.8"
+    "@polkadot/util-crypto" "^0.22.8"
     bs58 "^4.0.1"
 
 "@polkadot/util-rlp@^0.22.2":
@@ -871,12 +871,12 @@
     "@babel/runtime" "^7.0.0-beta.47"
     "@polkadot/util" "^0.22.2"
 
-"@polkadot/util-rlp@^0.22.7":
-  version "0.22.7"
-  resolved "https://registry.yarnpkg.com/@polkadot/util-rlp/-/util-rlp-0.22.7.tgz#7e958e95746bba5984d56858c1ada866286c2373"
+"@polkadot/util-rlp@^0.22.8":
+  version "0.22.8"
+  resolved "https://registry.yarnpkg.com/@polkadot/util-rlp/-/util-rlp-0.22.8.tgz#27a94e8bbee36ab5f44c240c5d538152327bedfa"
   dependencies:
     "@babel/runtime" "^7.0.0-beta.47"
-    "@polkadot/util" "^0.22.7"
+    "@polkadot/util" "^0.22.8"
 
 "@polkadot/util-triehash@^0.22.2":
   version "0.22.2"
@@ -887,14 +887,14 @@
     "@polkadot/util-crypto" "^0.22.2"
     "@polkadot/util-rlp" "^0.22.2"
 
-"@polkadot/util-triehash@^0.22.7":
-  version "0.22.7"
-  resolved "https://registry.yarnpkg.com/@polkadot/util-triehash/-/util-triehash-0.22.7.tgz#c6562c5325c415188d1cf49fa9d4899f1bbf7b9a"
+"@polkadot/util-triehash@^0.22.8":
+  version "0.22.8"
+  resolved "https://registry.yarnpkg.com/@polkadot/util-triehash/-/util-triehash-0.22.8.tgz#29b917854f5631f95264bffcf7bcfeaf702af529"
   dependencies:
     "@babel/runtime" "^7.0.0-beta.47"
-    "@polkadot/util" "^0.22.7"
-    "@polkadot/util-crypto" "^0.22.7"
-    "@polkadot/util-rlp" "^0.22.7"
+    "@polkadot/util" "^0.22.8"
+    "@polkadot/util-crypto" "^0.22.8"
+    "@polkadot/util-rlp" "^0.22.8"
 
 "@polkadot/util@^0.22.2":
   version "0.22.2"
@@ -905,9 +905,9 @@
     deasync "^0.1.12"
     ip-regex "^2.1.0"
 
-"@polkadot/util@^0.22.7":
-  version "0.22.7"
-  resolved "https://registry.yarnpkg.com/@polkadot/util/-/util-0.22.7.tgz#980451a0c0e84e99ee0e4d99ae6dd5fada960493"
+"@polkadot/util@^0.22.8":
+  version "0.22.8"
+  resolved "https://registry.yarnpkg.com/@polkadot/util/-/util-0.22.8.tgz#78fe6dffd41882dd5f41e9ce09755b653638c313"
   dependencies:
     "@babel/runtime" "^7.0.0-beta.47"
     bn.js "^4.11.8"