diff --git a/.changeset/funny-facts-beam.md b/.changeset/funny-facts-beam.md
new file mode 100644
index 00000000000..ce67b1a51aa
--- /dev/null
+++ b/.changeset/funny-facts-beam.md
@@ -0,0 +1,5 @@
+---
+"thirdweb": patch
+---
+
+Handle serialized bigints for packing userops
diff --git a/packages/thirdweb/src/wallets/smart/lib/packUserOp.ts b/packages/thirdweb/src/wallets/smart/lib/packUserOp.ts
index d4cc6277f87..b20a5220125 100644
--- a/packages/thirdweb/src/wallets/smart/lib/packUserOp.ts
+++ b/packages/thirdweb/src/wallets/smart/lib/packUserOp.ts
@@ -12,19 +12,19 @@ function getInitCode(unpackedUserOperation: UserOperationV07) {
 
 function getAccountGasLimits(unpackedUserOperation: UserOperationV07) {
   return concat([
-    pad(toHex(unpackedUserOperation.verificationGasLimit), {
+    pad(toHex(BigInt(unpackedUserOperation.verificationGasLimit)), {
       size: 16,
     }),
-    pad(toHex(unpackedUserOperation.callGasLimit), { size: 16 }),
+    pad(toHex(BigInt(unpackedUserOperation.callGasLimit)), { size: 16 }),
   ]) as Hex;
 }
 
 function getGasLimits(unpackedUserOperation: UserOperationV07) {
   return concat([
-    pad(toHex(unpackedUserOperation.maxPriorityFeePerGas), {
+    pad(toHex(BigInt(unpackedUserOperation.maxPriorityFeePerGas)), {
       size: 16,
     }),
-    pad(toHex(unpackedUserOperation.maxFeePerGas), { size: 16 }),
+    pad(toHex(BigInt(unpackedUserOperation.maxFeePerGas)), { size: 16 }),
   ]) as Hex;
 }
 
@@ -34,13 +34,13 @@ function getPaymasterAndData(unpackedUserOperation: UserOperationV07) {
         unpackedUserOperation.paymaster as Hex,
         pad(
           toHex(
-            unpackedUserOperation.paymasterVerificationGasLimit || BigInt(0),
+            BigInt(unpackedUserOperation.paymasterVerificationGasLimit || 0),
           ),
           {
             size: 16,
           },
         ),
-        pad(toHex(unpackedUserOperation.paymasterPostOpGasLimit || BigInt(0)), {
+        pad(toHex(BigInt(unpackedUserOperation.paymasterPostOpGasLimit || 0)), {
           size: 16,
         }),
         unpackedUserOperation.paymasterData || ("0x" as Hex),
@@ -53,11 +53,11 @@ export const getPackedUserOperation = (
 ): PackedUserOperation => {
   return {
     sender: userOperation.sender,
-    nonce: userOperation.nonce,
+    nonce: BigInt(userOperation.nonce),
     initCode: getInitCode(userOperation),
     callData: userOperation.callData,
     accountGasLimits: getAccountGasLimits(userOperation),
-    preVerificationGas: userOperation.preVerificationGas,
+    preVerificationGas: BigInt(userOperation.preVerificationGas),
     gasFees: getGasLimits(userOperation),
     paymasterAndData: getPaymasterAndData(userOperation),
     signature: userOperation.signature,