diff --git a/CHANGELOG.md b/CHANGELOG.md
index caf2fae176..ccd55afaa4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -23,6 +23,7 @@ BUG FIXES:
 * Fix spelling in docs using codespell ([#4954](https://github.com/microsoft/AzureTRE/issues/4954))
 * Replace deprecated yaspell with codespell and add pre-commit hook installer to devcontainer. ([#4953](https://github.com/microsoft/AzureTRE/issues/4953))
 * Fix Guacamole Windows VM image selections by aligning schema enums/defaults with supported image options in Windows and review VM templates. ([#4963](https://github.com/microsoft/AzureTRE/issues/4963))
+* Remove deprecated `soft_delete_enabled` setting from `azurerm_recovery_services_vault` in base workspace template. ([#4967](https://github.com/microsoft/AzureTRE/issues/4967))
 
 ## (0.28.0) (March 2, 2026)
 **BREAKING CHANGES**
diff --git a/templates/workspaces/base/porter.yaml b/templates/workspaces/base/porter.yaml
index 368df54022..22cb6cdfc3 100644
--- a/templates/workspaces/base/porter.yaml
+++ b/templates/workspaces/base/porter.yaml
@@ -1,7 +1,7 @@
 ---
 schemaVersion: 1.0.0
 name: tre-workspace-base
-version: 2.8.3
+version: 2.8.4
 description: "A base Azure TRE workspace"
 dockerfile: Dockerfile.tmpl
 registry: azuretre
diff --git a/templates/workspaces/base/terraform/backup/backup.tf b/templates/workspaces/base/terraform/backup/backup.tf
index 8273b31110..dcda7ce339 100644
--- a/templates/workspaces/base/terraform/backup/backup.tf
+++ b/templates/workspaces/base/terraform/backup/backup.tf
@@ -4,7 +4,6 @@ resource "azurerm_recovery_services_vault" "vault" {
   location            = var.location
   resource_group_name = var.resource_group_name
   sku                 = "Standard"
-  soft_delete_enabled = false
   storage_mode_type   = "ZoneRedundant" #  Possible values are "GeoRedundant", "LocallyRedundant" and "ZoneRedundant". Defaults to "GeoRedundant".
   tags                = var.tre_workspace_tags