diff --git a/contracts/package.json b/contracts/package.json
index b719ea5e7..28d08092a 100755
--- a/contracts/package.json
+++ b/contracts/package.json
@@ -19,7 +19,7 @@
 	"devDependencies": {
 		"ethers": "^5.5.3",
 		"prettier": "^2.3.0",
-		"synthetix": "^2.74.1",
+		"synthetix": "^2.74.2-alpha",
 		"typescript": "^4.4.2"
 	}
 }
diff --git a/packages/contracts-interface/__tests__/index.test.ts b/packages/contracts-interface/__tests__/index.test.ts
index 190d01823..76952f540 100644
--- a/packages/contracts-interface/__tests__/index.test.ts
+++ b/packages/contracts-interface/__tests__/index.test.ts
@@ -47,6 +47,7 @@ describe('@synthetixio/js tests', () => {
 	test('should include the supported networks', () => {
 		expect(snxjs.networkToChainId[NetworkNameById[1]]).toBe(NetworkIdByName.mainnet.toString());
 		expect(snxjs.networkToChainId[NetworkNameById[42]]).toBe(NetworkIdByName.kovan.toString());
+		expect(snxjs.networkToChainId[NetworkNameById[5]]).toBe(NetworkIdByName.goerli.toString());
 	});
 
 	test('should include the current network', () => {
diff --git a/packages/contracts-interface/package.json b/packages/contracts-interface/package.json
index 96f1b7ea9..716d04933 100644
--- a/packages/contracts-interface/package.json
+++ b/packages/contracts-interface/package.json
@@ -38,7 +38,7 @@
 	"dependencies": {
 		"@synthetixio/contracts": "workspace:*",
 		"ethers": "^5.5.3",
-		"synthetix": "^2.74.1"
+		"synthetix": "^2.74.2-alpha"
 	},
 	"devDependencies": {
 		"@babel/core": "^7.11.0",
diff --git a/packages/contracts-interface/src/synthetix.d.ts b/packages/contracts-interface/src/synthetix.d.ts
index 471a49315..e1e39e39d 100644
--- a/packages/contracts-interface/src/synthetix.d.ts
+++ b/packages/contracts-interface/src/synthetix.d.ts
@@ -105,6 +105,11 @@ declare module 'synthetix' {
 			fork: false,
 			network: 'goerli',
 		},
+		420: {
+			useOvm: true,
+			fork: false,
+			network: 'goerli',
+		},
 		10: {
 			useOvm: true,
 			fork: false,
@@ -128,7 +133,7 @@ declare module 'synthetix' {
 		'-1': {
 			useOvm: true,
 			fork: false,
-			network: 'goerli',
+			network: 'invalid',
 		},
 	} as const;
 	export const networkToChainId = {
@@ -138,7 +143,7 @@ declare module 'synthetix' {
 		kovan: 42,
 		'kovan-ovm': 69,
 		'mainnet-fork': 31337,
-		'goerli-ovm': '-1',
+		'goerli-ovm': 420,
 	} as const;
 	// eslint-disable-next-line
 	export function getSynths(arg: { network: NetworkName; useOvm?: boolean }): any; // Note contract interface will generate enums for this and return the correct type to consumers
diff --git a/packages/contracts-interface/src/types.ts b/packages/contracts-interface/src/types.ts
index eba49dd63..d9757d271 100644
--- a/packages/contracts-interface/src/types.ts
+++ b/packages/contracts-interface/src/types.ts
@@ -17,6 +17,7 @@ import { Synths as OptimismSynths } from '@synthetixio/contracts/build/mainnet-o
 export const NetworkIdByName = {
 	mainnet: 1,
 	goerli: 5,
+	'goerli-ovm': 420,
 	'mainnet-ovm': 10,
 	kovan: 42,
 	'kovan-ovm': 69,
@@ -29,6 +30,7 @@ export const NetworkNameById = {
 	42: 'kovan',
 	10: 'mainnet-ovm',
 	69: 'kovan-ovm',
+	420: 'goerli-ovm',
 	31337: 'mainnet-fork',
 } as const;