diff --git a/.gitignore b/.gitignore
index 040ddc62c..17bec4699 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,7 @@
+_book/
 build/
 coverage/
+docs/
 node_modules/
 tmp/
 .DS_Store
diff --git a/package.json b/package.json
index c4e7f35ce..945f7fa5b 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,7 @@
     "test": "jest --coverage"
   },
   "devDependencies": {
-    "@polkadot/dev": "^0.20.24",
+    "@polkadot/dev": "^0.20.25",
     "@polkadot/ts": "^0.1.30"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index 40dba9bb8..d7cae9d6d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1164,9 +1164,9 @@
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/@nodelib/fs.stat/-/fs.stat-1.1.0.tgz#50c1e2260ac0ed9439a181de3725a0168d59c48a"
 
-"@polkadot/dev@^0.20.24":
-  version "0.20.24"
-  resolved "https://registry.yarnpkg.com/@polkadot/dev/-/dev-0.20.24.tgz#e88af950aa4e0e1a549d0a4860b2b3f8d63ce723"
+"@polkadot/dev@^0.20.25":
+  version "0.20.25"
+  resolved "https://registry.yarnpkg.com/@polkadot/dev/-/dev-0.20.25.tgz#864cacb25c6063c7209800b83a9731bc35d4c5ea"
   dependencies:
     "@babel/cli" "^7.0.0"
     "@babel/core" "^7.0.0"