diff --git a/backend/main.py b/backend/main.py
index 6cffc0f..a3a4af7 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -575,7 +575,7 @@ class SecurityHeadersMiddleware(BaseHTTPMiddleware):
             "style-src 'self' 'unsafe-inline' https://cdnjs.cloudflare.com https://fonts.googleapis.com https://cdn.jsdelivr.net; "
             "img-src 'self' data: blob:; "
             "connect-src 'self' blob: https://esm.sh https://unpkg.com https://cdnjs.cloudflare.com https://fonts.googleapis.com https://fonts.gstatic.com https://cdn.jsdelivr.net; "
-            "font-src 'self' data: https://fonts.gstatic.com; "
+            "font-src 'self' data: https://fonts.gstatic.com https://esm.sh; "
             "worker-src 'self' blob:; "
             "frame-src 'self' blob:;"
         )