diff --git a/.github/renovate.json b/.github/renovate.json
index ae4f0aa..a780298 100644
--- a/.github/renovate.json
+++ b/.github/renovate.json
@@ -4,9 +4,9 @@
     ":preserveSemverRanges"
   ],
   "labels": ["auto-update"],
+  "dependencyDashboardAutoclose": true,
   "enabledManagers": ["terraform"],
   "terraform": {
     "ignorePaths": ["**/context.tf", "examples/**"]
   }
 }
-
diff --git a/README.md b/README.md
index 4bd1488..aaa2df8 100644
--- a/README.md
+++ b/README.md
@@ -220,7 +220,6 @@ Available targets:
 |------|---------|
 | <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 0.13.0 |
 | <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 2.0 |
-| <a name="requirement_null"></a> [null](#requirement\_null) | >= 2.0 |
 
 ## Providers
 
@@ -322,6 +321,7 @@ Available targets:
 | <a name="input_subnet_ids"></a> [subnet\_ids](#input\_subnet\_ids) | List of subnet IDs for the DB. DB instance will be created in the VPC associated with the DB subnet group provisioned using the subnet IDs. Specify one of `subnet_ids`, `db_subnet_group_name` or `availability_zone` | `list(string)` | `[]` | no |
 | <a name="input_tags"></a> [tags](#input\_tags) | Additional tags (e.g. `{'BusinessUnit': 'XYZ'}`).<br>Neither the tag keys nor the tag values will be modified by this module. | `map(string)` | `{}` | no |
 | <a name="input_tenant"></a> [tenant](#input\_tenant) | ID element \_(Rarely used, not included by default)\_. A customer identifier, indicating who this instance of a resource is for | `string` | `null` | no |
+| <a name="input_timezone"></a> [timezone](#input\_timezone) | Time zone of the DB instance. timezone is currently only supported by Microsoft SQL Server. The timezone can only be set on creation. See [MSSQL User Guide](http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_SQLServer.html#SQLServer.Concepts.General.TimeZone) for more information. | `string` | `null` | no |
 | <a name="input_vpc_id"></a> [vpc\_id](#input\_vpc\_id) | VPC ID the DB instance will be created in | `string` | n/a | yes |
 
 ## Outputs
diff --git a/docs/terraform.md b/docs/terraform.md
index 74ab246..c6547e0 100644
--- a/docs/terraform.md
+++ b/docs/terraform.md
@@ -5,7 +5,6 @@
 |------|---------|
 | <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 0.13.0 |
 | <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 2.0 |
-| <a name="requirement_null"></a> [null](#requirement\_null) | >= 2.0 |
 
 ## Providers
 
@@ -107,6 +106,7 @@
 | <a name="input_subnet_ids"></a> [subnet\_ids](#input\_subnet\_ids) | List of subnet IDs for the DB. DB instance will be created in the VPC associated with the DB subnet group provisioned using the subnet IDs. Specify one of `subnet_ids`, `db_subnet_group_name` or `availability_zone` | `list(string)` | `[]` | no |
 | <a name="input_tags"></a> [tags](#input\_tags) | Additional tags (e.g. `{'BusinessUnit': 'XYZ'}`).<br>Neither the tag keys nor the tag values will be modified by this module. | `map(string)` | `{}` | no |
 | <a name="input_tenant"></a> [tenant](#input\_tenant) | ID element \_(Rarely used, not included by default)\_. A customer identifier, indicating who this instance of a resource is for | `string` | `null` | no |
+| <a name="input_timezone"></a> [timezone](#input\_timezone) | Time zone of the DB instance. timezone is currently only supported by Microsoft SQL Server. The timezone can only be set on creation. See [MSSQL User Guide](http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_SQLServer.html#SQLServer.Concepts.General.TimeZone) for more information. | `string` | `null` | no |
 | <a name="input_vpc_id"></a> [vpc\_id](#input\_vpc\_id) | VPC ID the DB instance will be created in | `string` | n/a | yes |
 
 ## Outputs
diff --git a/examples/complete/fixtures.us-east-2.tfvars b/examples/complete/fixtures.us-east-2.tfvars
index 486641d..ea7886f 100644
--- a/examples/complete/fixtures.us-east-2.tfvars
+++ b/examples/complete/fixtures.us-east-2.tfvars
@@ -28,9 +28,9 @@ allocated_storage = 5
 
 engine = "mysql"
 
-engine_version = "5.7.17"
+engine_version = "5.7"
 
-major_engine_version = "5.7"
+major_engine_version = "5"
 
 instance_class = "db.t2.small"
 
diff --git a/examples/complete/main.tf b/examples/complete/main.tf
index d3fcec4..5c71c87 100644
--- a/examples/complete/main.tf
+++ b/examples/complete/main.tf
@@ -4,7 +4,7 @@ provider "aws" {
 
 module "vpc" {
   source  = "cloudposse/vpc/aws"
-  version = "0.21.1"
+  version = "0.28.1"
 
   cidr_block = "172.16.0.0/16"
 
@@ -13,7 +13,7 @@ module "vpc" {
 
 module "subnets" {
   source  = "cloudposse/dynamic-subnets/aws"
-  version = "0.38.0"
+  version = "0.40.1"
 
   availability_zones   = var.availability_zones
   vpc_id               = module.vpc.vpc_id
diff --git a/examples/complete/versions.tf b/examples/complete/versions.tf
new file mode 100644
index 0000000..5b2c49b
--- /dev/null
+++ b/examples/complete/versions.tf
@@ -0,0 +1,10 @@
+terraform {
+  required_version = ">= 0.13.0"
+
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = ">= 2.0"
+    }
+  }
+}
diff --git a/main.tf b/main.tf
index 437f5dc..2c3df2d 100644
--- a/main.tf
+++ b/main.tf
@@ -67,6 +67,7 @@ resource "aws_db_instance" "default" {
   deletion_protection         = var.deletion_protection
   final_snapshot_identifier   = length(var.final_snapshot_identifier) > 0 ? var.final_snapshot_identifier : module.final_snapshot_label.id
   replicate_source_db         = var.replicate_source_db
+  timezone                    = var.timezone
 
   iam_database_authentication_enabled   = var.iam_database_authentication_enabled
   enabled_cloudwatch_logs_exports       = var.enabled_cloudwatch_logs_exports
diff --git a/variables.tf b/variables.tf
index 51f6c07..f548f20 100644
--- a/variables.tf
+++ b/variables.tf
@@ -329,3 +329,9 @@ variable "replicate_source_db" {
   description = "Specifies that this resource is a Replicate database, and to use this value as the source database. This correlates to the `identifier` of another Amazon RDS Database to replicate (if replicating within a single region) or ARN of the Amazon RDS Database to replicate (if replicating cross-region). Note that if you are creating a cross-region replica of an encrypted database you will also need to specify a `kms_key_id`. See [DB Instance Replication](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Overview.Replication.html) and [Working with PostgreSQL and MySQL Read Replicas](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_ReadRepl.html) for more information on using Replication."
   default     = null
 }
+
+variable "timezone" {
+  type        = string
+  description = "Time zone of the DB instance. timezone is currently only supported by Microsoft SQL Server. The timezone can only be set on creation. See [MSSQL User Guide](http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_SQLServer.html#SQLServer.Concepts.General.TimeZone) for more information."
+  default     = null
+}
diff --git a/versions.tf b/versions.tf
index 971ae24..5b2c49b 100644
--- a/versions.tf
+++ b/versions.tf
@@ -6,9 +6,5 @@ terraform {
       source  = "hashicorp/aws"
       version = ">= 2.0"
     }
-    null = {
-      source  = "hashicorp/null"
-      version = ">= 2.0"
-    }
   }
 }