diff --git a/package-lock.json b/package-lock.json
index a64c4fd..b4cf97e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
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@@ -112,295 +115,23 @@
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-      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w=="
-    },
-    "yaeti": {
-      "version": "0.0.6",
-      "resolved": "https://registry.npmjs.org/yaeti/-/yaeti-0.0.6.tgz",
-      "integrity": "sha1-8m9ITXJoTPQr7ft2lwqhYI+/lXc="
-    },
-    "yallist": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
-      "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g=="
-    },
-    "yargs": {
-      "version": "12.0.5",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
-      "integrity": "sha512-Lhz8TLaYnxq/2ObqHDql8dX8CJi97oHxrjUcYtzKbbykPtVW9WB+poxI+NM2UIzsMgNCZTIf0AQwsjK5yMAqZw==",
-      "requires": {
-        "cliui": "^4.0.0",
-        "decamelize": "^1.2.0",
-        "find-up": "^3.0.0",
-        "get-caller-file": "^1.0.1",
-        "os-locale": "^3.0.0",
-        "require-directory": "^2.1.1",
-        "require-main-filename": "^1.0.1",
-        "set-blocking": "^2.0.0",
-        "string-width": "^2.0.0",
-        "which-module": "^2.0.0",
-        "y18n": "^3.2.1 || ^4.0.0",
-        "yargs-parser": "^11.1.1"
-      }
-    },
-    "yargs-parser": {
-      "version": "11.1.1",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
-      "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
-      "requires": {
-        "camelcase": "^5.0.0",
-        "decamelize": "^1.2.0"
-      }
+      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+      "dev": true
     },
     "yargs-unparser": {
       "version": "1.6.1",
diff --git a/package.json b/package.json
index d0bc6b3..c4c0dbc 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "fixed-merkle-tree",
-  "version": "0.6.0",
+  "version": "1.0.0",
   "description": "Fixed depth merkle tree implementation with sequential inserts",
   "repository": "https://github.com/tornadocash/fixed-merkle-tree.git",
   "main": "src/merkleTree.js",
@@ -18,10 +18,6 @@
   "files": [
     "src/*"
   ],
-  "dependencies": {
-    "snarkjs": "git+https://github.com/tornadocash/snarkjs.git#869181cfaf7526fe8972073d31655493a04326d5",
-    "circomlib": "git+https://github.com/tornadocash/circomlib.git#5beb6aee94923052faeecea40135d45b6ce6172c"
-  },
   "devDependencies": {
     "babel-eslint": "^10.1.0",
     "chai": "^4.2.0",
diff --git a/src/merkleTree.js b/src/merkleTree.js
index 3e6bb3b..333033b 100644
--- a/src/merkleTree.js
+++ b/src/merkleTree.js
@@ -1,9 +1,5 @@
-// keccak256("tornado") % BN254_FIELD_SIZE
-const DEFAULT_ZERO = '21663839004416932945382355908790599225266501822907911457504978515578255421292'
-const defaultHash = require('./mimc')
-
+const defaultHash = require('./sha256')
 // todo ensure consistent types in tree and inserted elements?
-// todo make sha3 default hasher (and update tests) to get rid of mimc/snarkjs/circomlib dependency
 
 /**
  * @callback hashFunction
@@ -22,7 +18,7 @@ class MerkleTree {
    * @param {hashFunction} [options.hashFunction] Function used to hash 2 leaves
    * @param [options.zeroElement] Value for non-existent leaves
    */
-  constructor(levels, elements = [], { hashFunction, zeroElement = DEFAULT_ZERO } = {}) {
+  constructor(levels, elements = [], { hashFunction, zeroElement = 0 } = {}) {
     this.levels = levels
     this.capacity = 2 ** levels
     if (elements.length > this.capacity) {
diff --git a/src/mimc.js b/src/mimc.js
deleted file mode 100644
index a43b057..0000000
--- a/src/mimc.js
+++ /dev/null
@@ -1,3 +0,0 @@
-const { mimcsponge } = require('circomlib')
-const { bigInt } = require('snarkjs')
-module.exports = (left, right) => mimcsponge.multiHash([bigInt(left), bigInt(right)]).toString()
diff --git a/src/sha256.js b/src/sha256.js
new file mode 100644
index 0000000..cab9400
--- /dev/null
+++ b/src/sha256.js
@@ -0,0 +1,15 @@
+const crypto = require('crypto')
+
+function toBuffer256(number) {
+  return Buffer.from(number.toString(16).padStart(512, '0'), 'hex')
+}
+
+function sha256(left, right) {
+  return crypto
+    .createHash('sha256')
+    .update(toBuffer256(left))
+    .update(toBuffer256(right))
+    .digest('hex')
+}
+
+module.exports = sha256
\ No newline at end of file