diff --git a/parsons/s4f-conference.nix b/parsons/s4f-conference.nix
index 2d95021..12bd7cb 100644
--- a/parsons/s4f-conference.nix
+++ b/parsons/s4f-conference.nix
@@ -126,6 +126,8 @@
         proxy_hide_header Content-Security-Policy;
         proxy_hide_header X-Frame-Options;
         proxy_redirect off;
+
+        client_max_body_size 100M;
       '';
     };
     forceSSL = true;