diff --git a/packages/testcases/package.json b/packages/testcases/package.json
index bf13f4ff..a70f731f 100644
--- a/packages/testcases/package.json
+++ b/packages/testcases/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@ethersproject/testcases",
-  "version": "5.0.0-beta.126",
+  "version": "5.0.0-beta.127",
   "description": "Testcases for Ethereum and scripts to generate testcases.",
   "main": "index.js",
   "browser": "browser.js",
@@ -15,13 +15,13 @@
     "browserify-zlib": "^0.2.0"
   },
   "devDependencies": {
+    "@ethersproject/cli": ">=5.0.0-beta.133",
     "@types/bip39": "2.4.1",
     "@types/bitcoinjs-lib": "3.3.2",
     "bip39": "2.5.0",
     "bitcoinjs-lib": "3.3.2",
     "ethereumjs-tx": "^1.3.5",
-    "ethereumjs-util": "^5.2.0",
-    "solc": "0.5.9"
+    "ethereumjs-util": "^5.2.0"
   },
   "keywords": [
     "Ethereum",
@@ -32,5 +32,5 @@
   "publishConfig": {
     "access": "public"
   },
-  "tarballHash": "0xfff9df8ed261c3864aa377821af02945ecafd9160c443500de38fee4fe5652ce"
+  "tarballHash": "0xd661e673f06d0cd44fec8bbef06c1f6e0b0c5113b6311ea0ec236af4310a5b19"
 }
diff --git a/packages/testcases/src.ts/generation-scripts/abi.ts b/packages/testcases/src.ts/generation-scripts/abi.ts
index 71ccfaf3..9118ac76 100644
--- a/packages/testcases/src.ts/generation-scripts/abi.ts
+++ b/packages/testcases/src.ts/generation-scripts/abi.ts
@@ -2,7 +2,8 @@
 
 //let web3 = new Web3(new Web3.providers.HttpProvider('http://127.0.0.1:8549'));
 
-import { compile as _compile } from "solc";
+//import { compile as _compile } from "solc";
+import { compile } from "@ethersproject/cli/solc";
 
 import { randomHexString, randomNumber } from ".."
 import { BN, keccak256, toChecksumAddress } from "ethereumjs-util";
@@ -58,41 +59,6 @@ class Code {
     }
 }
 
-function compile(source: string): string {
-    let input = {
-        language: "Solidity",
-        sources: {
-            "test.sol": {
-                content: source
-            }
-        },
-        settings: {
-           optimizer: {
-               enabled: true,
-               runs: 200
-           },
-            evmVersion: "byzantium",
-            outputSelection: {
-                "*": {
-                    "*": [ "evm.bytecode" ]
-                }
-            }
-        }
-    };
-
-    let output = JSON.parse(_compile(JSON.stringify(input)));
-    let errors = ((<any>output).errors || []).filter((e : any) => (e.severity == "error"));
-
-    if (errors.length) {
-        errors.forEach((error: any) => {
-            console.log(error.formattedMessage);
-        });
-        process.exit();
-    }
-
-    return "0x" + output.contracts["test.sol"].Test.evm.bytecode.object;
-}
-
 //idea:  "tuple(address)/*StructABCDEFG*/"
 type TestData = {
     // The data type
@@ -651,7 +617,7 @@ for (let i = 0; i < 100; i++) {
     let solidity = generateSolidity(params);
     console.log(solidity);
     console.log(i);
-    let bytecode = compile(solidity);
+    let bytecode = compile(solidity)[0].bytecode;
     //console.log(params.map(p => p.type).join(", "));
     //console.log(bytecode);
     let testcase = {
diff --git a/tsconfig.project.json b/tsconfig.project.json
index eb9ec237..fd653d22 100644
--- a/tsconfig.project.json
+++ b/tsconfig.project.json
@@ -66,9 +66,6 @@
     {
       "path": "./packages/solidity"
     },
-    {
-      "path": "./packages/testcases"
-    },
     {
       "path": "./packages/transactions"
     },
@@ -111,6 +108,9 @@
     {
       "path": "./packages/experimental"
     },
+    {
+      "path": "./packages/testcases"
+    },
     {
       "path": "./packages/tests"
     }