diff --git a/package-lock.json b/package-lock.json
index 5d6c6c28..15478f4b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,7 @@
       "version": "1.0.0",
       "license": "LGPL-3.0-only",
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@@ -38,13 +38,13 @@
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+      "resolved": "https://registry.npmjs.org/@0x/assert/-/assert-3.0.28.tgz",
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-        "@0x/typescript-typings": "^5.1.5",
-        "@0x/utils": "^5.6.3",
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@@ -54,13 +54,13 @@
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+      "resolved": "https://registry.npmjs.org/@0x/json-schemas/-/json-schemas-6.2.0.tgz",
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+        "@0x/typescript-typings": "^5.2.0",
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@@ -68,22 +68,23 @@
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-        "@0x/typescript-typings": "^5.1.1",
-        "@0x/utils": "^5.5.1",
-        "@0x/web3-wrapper": "^7.2.0",
+      "version": "4.7.4",
+      "resolved": "https://registry.npmjs.org/@0x/sol-compiler/-/sol-compiler-4.7.4.tgz",
+      "integrity": "sha512-6GF2Syg6T4hBbrL5heb0DLrGI0/6AU/zHWJOoke1ZFfO2bcUiF4F8r4Lh97EIz3hFiMIxKD2XoM9QlDQVn/DJg==",
+      "dependencies": {
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+        "@0x/json-schemas": "^6.2.0",
+        "@0x/sol-resolver": "^3.1.8",
+        "@0x/types": "^3.3.3",
+        "@0x/typescript-typings": "^5.2.0",
+        "@0x/utils": "^6.4.3",
+        "@0x/web3-wrapper": "^7.5.4",
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-        "ethereum-types": "^3.2.0",
-        "ethereumjs-util": "^5.1.1",
+        "ethereum-types": "^3.5.0",
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@@ -91,6 +92,7 @@
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         "solc": "^0.5.5",
         "source-map-support": "^0.5.0",
+        "strip-comments": "^2.0.1",
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         "yargs": "^10.0.3"
       },
@@ -101,13 +103,42 @@
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+      "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-5.1.0.tgz",
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+      "dependencies": {
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+      }
+    },
+    "node_modules/@0x/sol-compiler/node_modules/bn.js": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.0.tgz",
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+    },
+    "node_modules/@0x/sol-compiler/node_modules/ethereumjs-util": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-7.1.0.tgz",
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+        "bn.js": "^5.1.2",
+        "create-hash": "^1.1.2",
+        "ethereum-cryptography": "^0.1.3",
+        "ethjs-util": "0.1.6",
+        "rlp": "^2.2.4"
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-      "resolved": "https://registry.npmjs.org/@0x/sol-resolver/-/sol-resolver-3.1.4.tgz",
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+      "version": "3.1.8",
+      "resolved": "https://registry.npmjs.org/@0x/sol-resolver/-/sol-resolver-3.1.8.tgz",
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-        "@0x/typescript-typings": "^5.1.5",
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@@ -116,28 +147,28 @@
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+      "resolved": "https://registry.npmjs.org/@0x/typescript-typings/-/typescript-typings-5.2.0.tgz",
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@@ -145,19 +176,20 @@
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+      "resolved": "https://registry.npmjs.org/@0x/utils/-/utils-6.4.3.tgz",
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-        "@0x/types": "^3.2.4",
-        "@0x/typescript-typings": "^5.1.5",
+        "@0x/types": "^3.3.3",
+        "@0x/typescript-typings": "^5.2.0",
+        "@types/mocha": "^5.2.7",
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@@ -167,18 +199,47 @@
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+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.0.tgz",
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+      "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-7.1.0.tgz",
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+        "bn.js": "^5.1.2",
+        "create-hash": "^1.1.2",
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-        "@0x/typescript-typings": "^5.1.5",
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+      "resolved": "https://registry.npmjs.org/@0x/web3-wrapper/-/web3-wrapper-7.5.4.tgz",
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@@ -186,6 +247,35 @@
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@@ -3217,9 +3318,9 @@
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@@ -4396,7 +4497,6 @@
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@@ -4542,7 +4642,6 @@
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@@ -5077,9 +5176,9 @@
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+      "resolved": "https://registry.npmjs.org/@types/react/-/react-17.0.15.tgz",
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+        "@types/scheduler": "*",
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+    "@types/scheduler": {
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+      "resolved": "https://registry.npmjs.org/@types/scheduler/-/scheduler-0.16.2.tgz",
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@@ -20479,9 +20671,9 @@
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@@ -21988,9 +22180,9 @@
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+      "resolved": "https://registry.npmjs.org/csstype/-/csstype-3.0.8.tgz",
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-      "resolved": "https://registry.npmjs.org/ethereum-types/-/ethereum-types-3.3.3.tgz",
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+      "version": "3.5.0",
+      "resolved": "https://registry.npmjs.org/ethereum-types/-/ethereum-types-3.5.0.tgz",
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@@ -26082,7 +26274,8 @@
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@@ -30113,6 +30306,11 @@
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+    "strip-comments": {
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+      "resolved": "https://registry.npmjs.org/strip-comments/-/strip-comments-2.0.1.tgz",
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diff --git a/package.json b/package.json
old mode 100755
new mode 100644
index 844451e1..7c829a98
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
   "license": "LGPL-3.0-only",
   "repository": "https://github.com/zeriontech/defi-sdk",
   "dependencies": {
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+    "@0x/sol-compiler": "4.7.4",
     "@babel/core": "7.11.6",
     "@babel/preset-env": "7.11.5",
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