diff --git a/.changeset/silent-rats-retire.md b/.changeset/silent-rats-retire.md
new file mode 100644
index 0000000..fd43094
--- /dev/null
+++ b/.changeset/silent-rats-retire.md
@@ -0,0 +1,5 @@
+---
+"ynab-sync-westpac-au": patch
+---
+
+Fixes issue with Westpac login treating headless chrome as an incompatible browser
diff --git a/packages/westpac-au/src/export/login.ts b/packages/westpac-au/src/export/login.ts
index 45eb834..eb36b20 100644
--- a/packages/westpac-au/src/export/login.ts
+++ b/packages/westpac-au/src/export/login.ts
@@ -51,6 +51,13 @@ export async function login(
     loginTimeoutInMs: 2000,
   }
 ): Promise<void> {
+  // Westpac attempts to detect browser compatibility by checking the user agent and redirects to an error page if it's not compatible.
+  // When running in headless mode the user agent string contains "HeadlessChrome" which Westpac detects as incompatible,
+  // so we'll replace the user agent string with a compatible one.
+  await page.setUserAgent(
+    (await page.browser().userAgent()).replace("HeadlessChrome", "Chrome")
+  );
+
   await page.goto(
     "https://banking.westpac.com.au/wbc/banking/handler?TAM_OP=login&segment=personal&logout=false"
   );
diff --git a/packages/westpac-au/src/sync/syncTransactions.ts b/packages/westpac-au/src/sync/syncTransactions.ts
index b36d26f..95302e7 100644
--- a/packages/westpac-au/src/sync/syncTransactions.ts
+++ b/packages/westpac-au/src/sync/syncTransactions.ts
@@ -91,8 +91,8 @@ export const syncTransactions = async (
   const outputFilePath = await exportTransactions(
     page,
     params.westpacAccount.accountName,
-    params.options.startDate,
-    params.options.endDate,
+    startDate,
+    endDate,
     undefined,
     {
       debug: params.options.debug || false,