diff --git a/package-lock.json b/package-lock.json
index 0eda4529..6e830441 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@daostack/arc-experimental",
-  "version": "0.1.1-rc.19",
+  "version": "0.1.1-rc.20",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -264,9 +264,9 @@
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     },
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-      "resolved": "https://registry.npmjs.org/@nomiclabs/buidler/-/buidler-1.3.2.tgz",
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+      "version": "1.3.3",
+      "resolved": "https://registry.npmjs.org/@nomiclabs/buidler/-/buidler-1.3.3.tgz",
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@@ -275,8 +275,6 @@
         "@types/lru-cache": "^5.1.0",
         "abort-controller": "^3.0.0",
         "ansi-escapes": "^4.3.0",
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         "ci-info": "^2.0.0",
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@@ -284,6 +282,7 @@
         "download": "^7.1.0",
         "enquirer": "^2.3.0",
         "eth-sig-util": "^2.5.2",
+        "ethereum-cryptography": "^0.1.2",
         "ethereumjs-abi": "^0.6.8",
         "ethereumjs-account": "^3.0.0",
         "ethereumjs-block": "^2.2.0",
@@ -298,7 +297,7 @@
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@@ -318,28 +317,10 @@
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-          "resolved": "https://registry.npmjs.org/@types/node/-/node-11.11.6.tgz",
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-          "requires": {
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-          "resolved": "https://registry.npmjs.org/commander/-/commander-2.15.1.tgz",
-          "integrity": "sha512-VlfT9F3V0v+jr4yxPc5gg9s62/fIVWsd2Bk2iD435um1NlGMYdVCq+MjcXnhYq2icNOizHr1kK+5TI6H0Hy0ag==",
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+          "resolved": "https://registry.npmjs.org/commander/-/commander-3.0.2.tgz",
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@@ -535,71 +516,6 @@
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@@ -658,12 +574,6 @@
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@@ -694,36 +604,27 @@
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+      "version": "1.3.3",
+      "resolved": "https://registry.npmjs.org/@nomiclabs/buidler-solhint/-/buidler-solhint-1.3.3.tgz",
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+      "resolved": "https://registry.npmjs.org/@nomiclabs/buidler-truffle5/-/buidler-truffle5-1.3.3.tgz",
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@@ -747,9 +648,9 @@
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+      "version": "1.3.3",
+      "resolved": "https://registry.npmjs.org/@nomiclabs/buidler-web3/-/buidler-web3-1.3.3.tgz",
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@@ -959,9 +860,9 @@
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+          "resolved": "https://registry.npmjs.org/@types/node/-/node-12.12.39.tgz",
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@@ -1548,9 +1449,9 @@
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@@ -1800,9 +1701,9 @@
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+          "resolved": "https://registry.npmjs.org/@types/node/-/node-12.12.39.tgz",
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@@ -2240,9 +2141,27 @@
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+      "resolved": "https://registry.npmjs.org/@types/pbkdf2/-/pbkdf2-3.0.0.tgz",
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+      "dev": true,
+      "requires": {
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+    "@types/secp256k1": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/@types/secp256k1/-/secp256k1-4.0.1.tgz",
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+      "dev": true,
+      "requires": {
+        "@types/node": "*"
+      }
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@@ -2853,29 +2772,6 @@
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@@ -2905,6 +2801,12 @@
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+      "resolved": "https://registry.npmjs.org/blakejs/-/blakejs-1.1.0.tgz",
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+      "requires": {
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+        "@types/secp256k1": "^4.0.1",
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+          "dev": true,
+          "requires": {
+            "node-addon-api": "^2.0.0",
+            "node-gyp-build": "^4.2.0"
+          }
+        },
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+          "resolved": "https://registry.npmjs.org/scrypt-js/-/scrypt-js-3.0.0.tgz",
+          "integrity": "sha512-7CC7aufwukEvqdmllR0ny0QaSg0+S22xKXrXz3ZahaV6J+fgD2YAtrjtImuoDWog17/Ty9Q4HBmnXEXJ3JkfQA==",
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+        },
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+          "resolved": "https://registry.npmjs.org/secp256k1/-/secp256k1-4.0.1.tgz",
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+          "dev": true,
+          "requires": {
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+            "node-addon-api": "^2.0.0",
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     "ethereum-ens": {
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@@ -6108,9 +6062,9 @@
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diff --git a/package.json b/package.json
index 31b847cc..a7a2a9b6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@daostack/arc-experimental",
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+  "version": "0.1.1-rc.20",
   "description": "A platform for building DAOs",
   "files": [
     "contracts/",