diff --git a/website/docs/guides/4.0-upgrade-guide.html.markdown b/website/docs/guides/4.0-upgrade-guide.html.markdown
index 877ccc7becba..c1dbe08e25a0 100644
--- a/website/docs/guides/4.0-upgrade-guide.html.markdown
+++ b/website/docs/guides/4.0-upgrade-guide.html.markdown
@@ -924,6 +924,14 @@ The deprecated data source has been superseded by `azurerm_mssql_server` and has
 * The deprecated `metric.retention_policy` block has been removed in favour of the `azurerm_storage_management_policy` resource.
 * The deprecated `log` block has been removed in favour of the `enabled_log` block.
 
+### `azurerm_mssql_managed_database`
+
+* The `long_term_retention_policy.immutable_backups_enabled` property has been removed due to a breaking SDK upgrade.
+
+### `azurerm_mssql_database`
+
+* The `long_term_retention_policy.immutable_backups_enabled` property has been removed due to a breaking SDK upgrade.
+
 ### `azurerm_netapp_pool`
 
 * The `qos_type` property now defaults to `Auto`.
diff --git a/website/docs/r/mssql_database.html.markdown b/website/docs/r/mssql_database.html.markdown
index b3dad69e734b..d1ad2bbf0043 100644
--- a/website/docs/r/mssql_database.html.markdown
+++ b/website/docs/r/mssql_database.html.markdown
@@ -294,7 +294,6 @@ A `long_term_retention_policy` block supports the following:
 * `monthly_retention` - (Optional) The monthly retention policy for an LTR backup in an ISO 8601 format. Valid value is between 1 to 120 months. e.g. `P1Y`, `P1M`, `P4W` or `P30D`.
 * `yearly_retention` - (Optional) The yearly retention policy for an LTR backup in an ISO 8601 format. Valid value is between 1 to 10 years. e.g. `P1Y`, `P12M`, `P52W` or `P365D`.
 * `week_of_year` - (Optional) The week of year to take the yearly backup. Value has to be between `1` and `52`.
-* `immutable_backups_enabled` - (Optional) Specifies if the backups are immutable. Defaults to `false`.
 
 ---
 
diff --git a/website/docs/r/mssql_managed_database.html.markdown b/website/docs/r/mssql_managed_database.html.markdown
index c84de00d3975..4b95e8185d65 100644
--- a/website/docs/r/mssql_managed_database.html.markdown
+++ b/website/docs/r/mssql_managed_database.html.markdown
@@ -82,7 +82,6 @@ A `long_term_retention_policy` block supports the following:
 * `monthly_retention` - (Optional) The monthly retention policy for an LTR backup in an ISO 8601 format. Valid value is between 1 to 120 months. e.g. `P1Y`, `P1M`, `P4W` or `P30D`.
 * `yearly_retention` - (Optional) The yearly retention policy for an LTR backup in an ISO 8601 format. Valid value is between 1 to 10 years. e.g. `P1Y`, `P12M`, `P52W` or `P365D`.
 * `week_of_year` - (Optional) The week of year to take the yearly backup. Value has to be between `1` and `52`.
-* `immutable_backups_enabled` - (Optional) Specifies if the backups are immutable. Defaults to `false`.
 
 ---