diff --git a/internal/services/mssqlmanagedinstance/mssql_managed_instance_resource.go b/internal/services/mssqlmanagedinstance/mssql_managed_instance_resource.go
index fd856b9b4357..e8e9e539bb20 100644
--- a/internal/services/mssqlmanagedinstance/mssql_managed_instance_resource.go
+++ b/internal/services/mssqlmanagedinstance/mssql_managed_instance_resource.go
@@ -138,13 +138,21 @@ func (r MsSqlManagedInstanceResource) Arguments() map[string]*pluginsdk.Schema {
 			Required: true,
 			ValidateFunc: validation.IntInSlice([]int{
 				4,
+				6,
 				8,
+				10,
+				12,
 				16,
+				20,
 				24,
 				32,
 				40,
+				48,
+				56,
 				64,
 				80,
+				96,
+				128,
 			}),
 		},
 
diff --git a/website/docs/r/mssql_managed_instance.html.markdown b/website/docs/r/mssql_managed_instance.html.markdown
index 2a5cd5fabf06..c352324abe73 100644
--- a/website/docs/r/mssql_managed_instance.html.markdown
+++ b/website/docs/r/mssql_managed_instance.html.markdown
@@ -225,7 +225,7 @@ The following arguments are supported:
 
 * `subnet_id` - (Required) The subnet resource id that the SQL Managed Instance will be associated with. Changing this forces a new resource to be created.
 
-* `vcores` - (Required) Number of cores that should be assigned to the SQL Managed Instance. Values can be `8`, `16`, or `24` for Gen4 SKUs, or `4`, `8`, `16`, `24`, `32`, `40`, `64`, or `80` for Gen5 SKUs.
+* `vcores` - (Required) Number of cores that should be assigned to the SQL Managed Instance. Values can be `8`, `16`, or `24` for Gen4 SKUs, or `4`, `6`, `8`, `10`, `12`, `16`, `20`, `24`, `32`, `40`, `48`, `56`, `64`, `80`, `96` or `128` for Gen5 SKUs.
 
 * `collation` - (Optional) Specifies how the SQL Managed Instance will be collated. Default value is `SQL_Latin1_General_CP1_CI_AS`. Changing this forces a new resource to be created.