diff --git a/nginx.conf b/nginx.conf
index 3aa17e6..59e4c89 100644
--- a/nginx.conf
+++ b/nginx.conf
@@ -2,6 +2,10 @@ server {
     listen 80;
     server_name _;
 
+    # Increase buffer size to handle large IAP JWT headers
+    client_header_buffer_size 4k;
+    large_client_header_buffers 4 16k;
+
     root /usr/share/nginx/html;
     index index.html;