diff --git a/hetzner-cloud/main.tf b/hetzner-cloud/main.tf
index 3a3dd78..abaeab3 100644
--- a/hetzner-cloud/main.tf
+++ b/hetzner-cloud/main.tf
@@ -200,7 +200,7 @@ data "coder_parameter" "fleet_version" {
   name         = "fleet_version"
   display_name = "Fleet version"
   description  = "Which version of Fleet should be installed?"
-  default      = "1.24.137"
+  default      = "1.28.117"
   type         = "string"
   mutable      = true
 }
@@ -250,7 +250,7 @@ data "coder_workspace" "me" {
 }
 
 resource "coder_agent" "dev" {
-  arch = "amd64"
+  arch = startswith(data.coder_parameter.instance_type.value, "cax") ? "arm64" : "amd64"
   os   = "linux"
 
   startup_script = data.coder_parameter.dotfiles_uri.value != "" ? "coder dotfiles -y ${data.coder_parameter.dotfiles_uri.value}" : null