diff --git a/nixos/modules/services/web-servers/caddy/default.nix b/nixos/modules/services/web-servers/caddy/default.nix
index 2ff45efd4e43..d707a6c4635c 100644
--- a/nixos/modules/services/web-servers/caddy/default.nix
+++ b/nixos/modules/services/web-servers/caddy/default.nix
@@ -448,8 +448,8 @@ in
     '';
 
     # https://github.com/quic-go/quic-go/wiki/UDP-Buffer-Sizes
-    boot.kernel.sysctl."net.core.rmem_max" = mkDefault 2500000;
-    boot.kernel.sysctl."net.core.wmem_max" = mkDefault 2500000;
+    boot.kernel.sysctl."net.core.rmem_max" = mkDefault 7500000;
+    boot.kernel.sysctl."net.core.wmem_max" = mkDefault 7500000;
 
     systemd.packages = [ cfg.package ];
     systemd.services.caddy = {