diff --git a/roles/hackmd/templates/vhost.j2 b/roles/hackmd/templates/vhost.j2
index c1f92fb..c767857 100644
--- a/roles/hackmd/templates/vhost.j2
+++ b/roles/hackmd/templates/vhost.j2
@@ -23,6 +23,9 @@ server {
 	ssl_certificate_key /etc/nginx/ssl/{{ hackmd_domain }}.key;
 	ssl_certificate /etc/nginx/ssl/{{ hackmd_domain }}.crt;
 
+	# set max upload size
+	client_max_body_size 8M;
+
 	location / {
 		proxy_set_header X-Real-IP $remote_addr;
 		proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;