diff --git a/package.json b/package.json
index 0150cef..dc1c636 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "tornado-anonymity-mining",
-  "version": "2.0.1",
+  "version": "2.0.2",
   "main": "index.js",
   "repository": "https://github.com/tornadocash/tornado-anonymity-mining.git",
   "author": "Tornadocash team <hello@tornado.cash>",
@@ -52,7 +52,7 @@
     "eth-sig-util": "^2.5.3",
     "fixed-merkle-tree": "^0.3.4",
     "snarkjs": "git+https://github.com/tornadocash/snarkjs.git#869181cfaf7526fe8972073d31655493a04326d5",
-    "tornado-trees": "^0.0.4",
+    "tornado-trees": "^0.0.7",
     "web3": "^1.2.11",
     "websnark": "git+https://github.com/tornadocash/websnark.git#86a526718cd6f6f5d31bdb1fe26a9ec8819f633e"
   }
diff --git a/yarn.lock b/yarn.lock
index 256f67f..67ba8bd 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -93,6 +93,11 @@
     lodash "^4.17.19"
     to-fast-properties "^2.0.0"
 
+"@cto.af/textdecoder@^0.0.0":
+  version "0.0.0"
+  resolved "https://registry.yarnpkg.com/@cto.af/textdecoder/-/textdecoder-0.0.0.tgz#e1e8d84c936c30a0f4619971f19ca41941af9fdc"
+  integrity sha512-sJpx3F5xcVV/9jNYJQtvimo4Vfld/nD3ph+ZWtQzZ03Zo8rJC7QKQTRcIGS13Rcz80DwFNthCWMrd58vpY4ZAQ==
+
 "@ethersproject/abi@5.0.0-beta.153":
   version "5.0.0-beta.153"
   resolved "https://registry.yarnpkg.com/@ethersproject/abi/-/abi-5.0.0-beta.153.tgz#43a37172b33794e4562999f6e2d555b7599a8eee"
@@ -255,6 +260,27 @@
   resolved "https://registry.yarnpkg.com/@openzeppelin/contracts/-/contracts-3.1.0.tgz#bcea457ef89069fbe5a617f50b25b6a8272895d5"
   integrity sha512-dVXDnUKxrAKLzPdCRkz+N8qsVkK1XxJ6kk3zuI6zaQmcKxN7CkizoDP7lXxcs/Mi2I0mxceTRjJBqlzFffLJrQ==
 
+"@openzeppelin/contracts@^3.4.0":
+  version "3.4.1"
+  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts/-/contracts-3.4.1.tgz#03c891fec7f93be0ae44ed74e57a122a38732ce7"
+  integrity sha512-cUriqMauq1ylzP2TxePNdPqkwI7Le3Annh4K9rrpvKfSBB/bdW+Iu1ihBaTIABTAAJ85LmKL5SSPPL9ry8d1gQ==
+
+"@openzeppelin/upgrades-core@^1.5.1":
+  version "1.5.1"
+  resolved "https://registry.yarnpkg.com/@openzeppelin/upgrades-core/-/upgrades-core-1.5.1.tgz#2165f0c2961cc748e7d1c2bce1ba96589d31390b"
+  integrity sha512-rL0h/+Yfcky98XaxLRcxKunmC2uVP+dr9tVxzZfbjDpIco7VkmyODsI1YBPZTn3e5kCj7A6cmgNrFmao/UkQyA==
+  dependencies:
+    bn.js "^5.1.2"
+    cbor "^7.0.0"
+    chalk "^4.1.0"
+    compare-versions "^3.6.0"
+    debug "^4.1.1"
+    ethereumjs-util "^7.0.3"
+    fp-ts "^2.7.1"
+    io-ts "^2.2.9"
+    proper-lockfile "^4.1.1"
+    solidity-ast "^0.4.15"
+
 "@resolver-engine/core@^0.2.1":
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/@resolver-engine/core/-/core-0.2.1.tgz#0d71803f6d3b8cb2e9ed481a1bf0ca5f5256d0c0"
@@ -984,6 +1010,14 @@ caseless@~0.12.0:
   resolved "https://registry.yarnpkg.com/caseless/-/caseless-0.12.0.tgz#1b681c21ff84033c826543090689420d187151dc"
   integrity sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=
 
+cbor@^7.0.0:
+  version "7.0.3"
+  resolved "https://registry.yarnpkg.com/cbor/-/cbor-7.0.3.tgz#216d292f2aedd1bb61414a8f949b63e4de11b33b"
+  integrity sha512-Io+lJytjYBJKgJqZQUz2bFaMPj+HtlsnT9kHSUiIJFqzWa05lm5/ycQ+NiZWpks3DR2Fz7j7axiTGeT57w/syg==
+  dependencies:
+    "@cto.af/textdecoder" "^0.0.0"
+    nofilter "^2.0.3"
+
 chai-as-promised@^7.1.1:
   version "7.1.1"
   resolved "https://registry.yarnpkg.com/chai-as-promised/-/chai-as-promised-7.1.1.tgz#08645d825deb8696ee61725dbf590c012eb00ca0"
@@ -1012,7 +1046,7 @@ chalk@^2.0.0, chalk@^2.1.0, chalk@^2.4.2:
     escape-string-regexp "^1.0.5"
     supports-color "^5.3.0"
 
-chalk@^4.0.0:
+chalk@^4.0.0, chalk@^4.1.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-4.1.0.tgz#4e14870a618d9e2edd97dd8345fd9d9dc315646a"
   integrity sha512-qwx12AxXe2Q5xQ43Ac//I6v5aXTipYrSESdOgzrN+9XjgEpyjpKuvSGaN4qE93f7TQTlerQQ8S+EQ0EyDoVL1A==
@@ -1314,6 +1348,11 @@ commander@~2.8.1:
   dependencies:
     graceful-readlink ">= 1.0.0"
 
+compare-versions@^3.6.0:
+  version "3.6.0"
+  resolved "https://registry.yarnpkg.com/compare-versions/-/compare-versions-3.6.0.tgz#1a5689913685e5a87637b8d3ffca75514ec41d62"
+  integrity sha512-W6Af2Iw1z4CB7q4uU4hv646dW9GQuBM+YpC0UvUCWSD8w90SJjp+ujJuXaEMtAXBtSqGfMPuFOVn4/+FlaqfBA==
+
 concat-map@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
@@ -2695,6 +2734,11 @@ forwarded@~0.1.2:
   resolved "https://registry.yarnpkg.com/forwarded/-/forwarded-0.1.2.tgz#98c23dab1175657b8c0573e8ceccd91b0ff18c84"
   integrity sha1-mMI9qxF1ZXuMBXPozszZGw/xjIQ=
 
+fp-ts@^2.7.1:
+  version "2.9.5"
+  resolved "https://registry.yarnpkg.com/fp-ts/-/fp-ts-2.9.5.tgz#6690cd8b76b84214a38fc77cbbbd04a38f86ea90"
+  integrity sha512-MiHrA5teO6t8zKArE3DdMPT/Db6v2GUt5yfWnhBTrrsVfeCJUUnV6sgFvjGNBKDmEMqVwRFkEePL7wPwqrLKKA==
+
 fresh@0.5.2:
   version "0.5.2"
   resolved "https://registry.yarnpkg.com/fresh/-/fresh-0.5.2.tgz#3d8cadd90d976569fa835ab1f8e4b23a105605a7"
@@ -2943,6 +2987,11 @@ graceful-fs@^4.1.10, graceful-fs@^4.1.2, graceful-fs@^4.1.6, graceful-fs@^4.2.0:
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.4.tgz#2256bde14d3632958c465ebc96dc467ca07a29fb"
   integrity sha512-WjKPNJF79dtJAVniUlGGWHYGz2jWxT6VhN/4m1NdkbZ2nOsEF+cI1Edgql5zCRhs/VsQYRvrXctxktVXZUkixw==
 
+graceful-fs@^4.2.4:
+  version "4.2.6"
+  resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.6.tgz#ff040b2b0853b23c3d31027523706f1885d76bee"
+  integrity sha512-nTnJ528pbqxYanhpDYsi4Rd8MAeaBA67+RZ10CM1m3bTAVFEDcd5AuA4a6W5YkGZ1iNXHzZz8T6TBKLeBuNriQ==
+
 "graceful-readlink@>= 1.0.0":
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/graceful-readlink/-/graceful-readlink-1.0.1.tgz#4cafad76bc62f02fa039b2f94e9a3dd3a391a725"
@@ -3196,6 +3245,11 @@ invert-kv@^2.0.0:
   resolved "https://registry.yarnpkg.com/invert-kv/-/invert-kv-2.0.0.tgz#7393f5afa59ec9ff5f67a27620d11c226e3eec02"
   integrity sha512-wPVv/y/QQ/Uiirj/vh3oP+1Ww+AWehmi1g5fFWGPF6IpCBCDVrhgHRMvrLfdYcwDh3QJbGXDW4JAuzxElLSqKA==
 
+io-ts@^2.2.9:
+  version "2.2.15"
+  resolved "https://registry.yarnpkg.com/io-ts/-/io-ts-2.2.15.tgz#0b0b19a6f8a64f4a524ad5810d56432789428128"
+  integrity sha512-ww2ZPrErx5pjCCI/tWRwjlEIDEndnN9kBIxAylXj+WNIH4ZVgaUqFuabGouehkRuvrmvzO5OnZmLf+o50h4izQ==
+
 ipaddr.js@1.9.1:
   version "1.9.1"
   resolved "https://registry.yarnpkg.com/ipaddr.js/-/ipaddr.js-1.9.1.tgz#bff38543eeb8984825079ff3a2a8e6cbd46781b3"
@@ -4000,6 +4054,13 @@ node-gyp-build@^4.2.0:
   resolved "https://registry.yarnpkg.com/node-gyp-build/-/node-gyp-build-4.2.3.tgz#ce6277f853835f718829efb47db20f3e4d9c4739"
   integrity sha512-MN6ZpzmfNCRM+3t57PTJHgHyw/h4OWnZ6mR8P5j/uZtqQr46RRuDE/P+g3n0YR/AiYXeWixZZzaip77gdICfRg==
 
+nofilter@^2.0.3:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/nofilter/-/nofilter-2.0.3.tgz#f5460f3cb33147005883e3f5d4476239501fa187"
+  integrity sha512-FbuXC+lK+GU2+63D1kC1ETiZo+Z7SIi7B+mxKTCH1byrh6WFvfBCN/wpherFz0a0bjGd7EKTst/cz0yLeNngug==
+  dependencies:
+    "@cto.af/textdecoder" "^0.0.0"
+
 nopt@3.x:
   version "3.0.6"
   resolved "https://registry.yarnpkg.com/nopt/-/nopt-3.0.6.tgz#c6465dbf08abcd4db359317f79ac68a646b28ff9"
@@ -4451,6 +4512,15 @@ promise.allsettled@1.0.2:
     function-bind "^1.1.1"
     iterate-value "^1.0.0"
 
+proper-lockfile@^4.1.1:
+  version "4.1.2"
+  resolved "https://registry.yarnpkg.com/proper-lockfile/-/proper-lockfile-4.1.2.tgz#c8b9de2af6b2f1601067f98e01ac66baa223141f"
+  integrity sha512-TjNPblN4BwAWMXU8s9AEz4JmQxnD1NNL7bNOY/AKUzyamc379FWASUhc/K1pL2noVb+XmZKLL68cjzLsiOAMaA==
+  dependencies:
+    graceful-fs "^4.2.4"
+    retry "^0.12.0"
+    signal-exit "^3.0.2"
+
 proxy-addr@~2.0.5:
   version "2.0.6"
   resolved "https://registry.yarnpkg.com/proxy-addr/-/proxy-addr-2.0.6.tgz#fdc2336505447d3f2f2c638ed272caf614bbb2bf"
@@ -4705,6 +4775,11 @@ restore-cursor@^2.0.0:
     onetime "^2.0.0"
     signal-exit "^3.0.2"
 
+retry@^0.12.0:
+  version "0.12.0"
+  resolved "https://registry.yarnpkg.com/retry/-/retry-0.12.0.tgz#1b42a6266a21f07421d1b0b54b7dc167b01c013b"
+  integrity sha1-G0KmJmoh8HQh0bC1S33BZ7AcATs=
+
 reusify@^1.0.4:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/reusify/-/reusify-1.0.4.tgz#90da382b1e126efc02146e90845a88db12925d76"
@@ -5072,6 +5147,11 @@ solhint-plugin-prettier@^0.0.4:
   dependencies:
     prettier-linter-helpers "^1.0.0"
 
+solidity-ast@^0.4.15:
+  version "0.4.17"
+  resolved "https://registry.yarnpkg.com/solidity-ast/-/solidity-ast-0.4.17.tgz#e857b4f64466f3eb94da78fe961c0d256c84b228"
+  integrity sha512-5jkkabmjPdy9W9c2DMQBlKobVBz7KDnipxn+0zW191uD6BML3w7dQ+ihUvwA9XOm9ILDECrb5Y8z2vu47STqCg==
+
 solidity-coverage@^0.7.7:
   version "0.7.9"
   resolved "https://registry.yarnpkg.com/solidity-coverage/-/solidity-coverage-0.7.9.tgz#6d1c40639066b93c67b21da48f4bc27ae01f0e58"
@@ -5473,11 +5553,13 @@ torn-token@^1.0.0:
     ethereumjs-util "^7.0.3"
     web3 "^1.2.11"
 
-tornado-trees@^0.0.4:
-  version "0.0.4"
-  resolved "https://registry.yarnpkg.com/tornado-trees/-/tornado-trees-0.0.4.tgz#568838277b01f23c9a4c01318231dea0a4af83f3"
-  integrity sha512-SL/tJ2TlY9tBpQJumg4ebKCtp5AyRxL+z+5SLhklf50E1n2GIUpETzCVqbqqSPplE6sVgpyAbFnnK1/MfGgNIQ==
+tornado-trees@^0.0.7:
+  version "0.0.7"
+  resolved "https://registry.yarnpkg.com/tornado-trees/-/tornado-trees-0.0.7.tgz#4ce807c7b719c1519baf9859398c80263a47193b"
+  integrity sha512-jALw53yk3hkWXAa4e9HsFANCu1lUH4Y3mKTfzLtSV6s2FikICB++Pp2c43SIhS8QhFanwcyn5rYGqpQP1e0U1w==
   dependencies:
+    "@openzeppelin/contracts" "^3.4.0"
+    "@openzeppelin/upgrades-core" "^1.5.1"
     circom "^0.5.38"
     circom_runtime "^0.1.12"
     circomlib "git+https://github.com/tornadocash/circomlib.git#d20d53411d1bef61f38c99a8b36d5d0cc4836aa1"