diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index a54453e..312ff9a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -15,8 +15,9 @@ jobs:
       - uses: actions/setup-node@v1
         with:
           node-version: 12
-      - run: yarn install
       - run: cargo install zkutil
+      - run: yarn install
+      - run: yarn changeTreeHeight 2
       - run: yarn circuit
       - run: yarn test
       - run: yarn lint
diff --git a/contracts/mocks/Pack.sol b/contracts/mocks/Pack.sol
index a32c5e1..7c8a4f7 100644
--- a/contracts/mocks/Pack.sol
+++ b/contracts/mocks/Pack.sol
@@ -3,7 +3,7 @@
 pragma solidity ^0.6.0;
 
 contract Pack {
-  uint256 public constant CHUNK_TREE_HEIGHT = 7;
+  uint256 public constant CHUNK_TREE_HEIGHT = 8;
   uint256 public constant CHUNK_SIZE = 2**CHUNK_TREE_HEIGHT;
   uint256 public constant ITEM_SIZE = 32 + 20 + 4;
   uint256 public constant BYTES_SIZE = CHUNK_SIZE * ITEM_SIZE;
diff --git a/package.json b/package.json
index 3083b61..5c9f5c8 100644
--- a/package.json
+++ b/package.json
@@ -16,6 +16,7 @@
     "prettier:check": "prettier --check . --config .prettierrc",
     "prettier:fix": "prettier --write . --config .prettierrc",
     "lint": "yarn eslint && yarn prettier:check",
+    "changeTreeHeight": "scripts/changeTreeHeight.sh",
     "circuit:batchTreeUpdate": "scripts/buildCircuit.sh BatchTreeUpdate",
     "circuit:batchTreeUpdateLarge": "scripts/buildCircuit.sh BatchTreeUpdate large",
     "circuit:batchTreeUpdateWitness": "scripts/buildWitness.sh BatchTreeUpdate",
diff --git a/scripts/changeTreeHeight.sh b/scripts/changeTreeHeight.sh
new file mode 100755
index 0000000..003e8f3
--- /dev/null
+++ b/scripts/changeTreeHeight.sh
@@ -0,0 +1,7 @@
+#!/bin/bash
+case $(sed --help 2>&1) in
+  *GNU*) sed_i () { xargs sed -i "$@"; };;
+  *) sed_i () { xargs sed -i '' "$@"; };;
+esac
+
+grep -l --exclude-dir={.git,node_modules,artifacts} -r "CHUNK_TREE_HEIGHT = [0-9]" . | sed_i "s/CHUNK_TREE_HEIGHT = [0-9]/CHUNK_TREE_HEIGHT = ${1}/g"
diff --git a/test/pack.test.js b/test/pack.test.js
index aaac3c6..4bb982f 100644
--- a/test/pack.test.js
+++ b/test/pack.test.js
@@ -13,7 +13,7 @@ const hashes = [
   '0x57f7b90a3cb4ea6860e6dd5fa44ac4f53ebe6ae3948af577a01ef51738313246',
 ]
 
-const CHUNK_TREE_HEIGHT = 7
+const CHUNK_TREE_HEIGHT = 8
 describe.skip('Pack', () => {
   it('should work', async () => {
     const Pack = await ethers.getContractFactory('Pack')