diff --git a/src/App.tsx b/src/App.tsx
index ff318ed..2d6dcc7 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -60,9 +60,10 @@ export default function App() {
         let fileMeta = { rev: '', size: 0 };
         
         if (isDev) {
-          const fileUrl = '/dropbox-file/scl/fi/nkyabkq2jdwfudof2ovrl/Data-Matrix.xlsx?rlkey=1cz5fuabwipqqivihii7sybw0&st=io0g4wvb&dl=1';
-          console.log('Fetching Data-Matrix.xlsx from Dropbox...');
-          const response = await fetch(fileUrl);
+          const cacheBuster = `t_${Date.now()}`;
+          const fileUrl = `/dropbox-file/scl/fi/nkyabkq2jdwfudof2ovrl/Data-Matrix.xlsx?rlkey=1cz5fuabwipqqivihii7sybw0&st=io0g4wvb&dl=1&${cacheBuster}=${Date.now()}`;
+          console.log('Fetching Data-Matrix.xlsx from Dropbox (hard refresh)...');
+          const response = await fetch(fileUrl, { cache: 'no-store' });
           if (!response.ok) throw new Error(`HTTP ${response.status}`);
           const arrayBuffer = await response.arrayBuffer();
           if (arrayBuffer.byteLength < 100) throw new Error('File too small');
@@ -81,8 +82,8 @@ export default function App() {
             console.log('File meta:', fileMeta);
           }
           
-          console.log('Fetching Data-Matrix.xlsx from proxy...');
-          const response = await fetch('/api/dropbox-proxy');
+          console.log('Fetching Data-Matrix.xlsx from proxy (hard refresh)...');
+          const response = await fetch('/api/dropbox-proxy', { cache: 'no-store' });
           if (!response.ok) throw new Error(`HTTP ${response.status}`);
           const arrayBuffer = await response.arrayBuffer();
           if (arrayBuffer.byteLength < 100) throw new Error('File too small');