diff --git a/nixos/boxes/vpsfree1/mastodon.nix b/nixos/boxes/vpsfree1/mastodon.nix
index 2799e802..c618f242 100644
--- a/nixos/boxes/vpsfree1/mastodon.nix
+++ b/nixos/boxes/vpsfree1/mastodon.nix
@@ -130,6 +130,7 @@ in {
           createLocally = false;
           passwordFile = "${mailgunSmtpPasswordPath}";
         };
+        sidekiqThreads = 32;
         extraConfig = {
           SMTP_TLS = "true";
           SMTP_ENABLE_STARTTLS_AUTO = "true";