diff --git a/package-lock.json b/package-lock.json
index 1db130c..93a2245 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@orionprotocol/sdk",
-  "version": "0.21.0-rc14",
+  "version": "0.21.0-rc16",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@orionprotocol/sdk",
-      "version": "0.21.0-rc14",
+      "version": "0.21.0-rc16",
       "hasInstallScript": true,
       "license": "ISC",
       "dependencies": {
diff --git a/package.json b/package.json
index 42b69a3..3c898f4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@orionprotocol/sdk",
-  "version": "0.21.0-rc15",
+  "version": "0.21.0-rc16",
   "description": "Orion Protocol SDK",
   "main": "./lib/index.cjs",
   "module": "./lib/index.js",
diff --git a/src/crypt/signLockOrder.ts b/src/crypt/signLockOrder.ts
index 98ff265..52d659c 100644
--- a/src/crypt/signLockOrder.ts
+++ b/src/crypt/signLockOrder.ts
@@ -40,7 +40,7 @@ export const signLockOrder = async ({
       INTERNAL_PROTOCOL_PRECISION,
       BigNumber.ROUND_FLOOR,
     )),
-    targetChainId,
+    targetChainId: Number(targetChainId),
     secretHash
   };
 
diff --git a/src/types.ts b/src/types.ts
index 93e0b62..e50f495 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -60,7 +60,7 @@ export type LockOrder = {
   expiration: number // uint64
   asset: string // address(?)
   amount: number // uint64
-  targetChainId: SupportedChainId // uint64
+  targetChainId: number // uint64
   secretHash: string // bytes32
 }