diff --git a/.changelog/31489.txt b/.changelog/31489.txt
new file mode 100644
index 00000000000..c529440f63e
--- /dev/null
+++ b/.changelog/31489.txt
@@ -0,0 +1,3 @@
+```release-note:breaking-change
+resource/aws_lightsail_instance: The `ipv6_address` attribute has been removed
+```
\ No newline at end of file
diff --git a/internal/service/lightsail/instance.go b/internal/service/lightsail/instance.go
index f53d788b576..3eb9141bf2c 100644
--- a/internal/service/lightsail/instance.go
+++ b/internal/service/lightsail/instance.go
@@ -129,11 +129,6 @@ func ResourceInstance() *schema.Resource {
 				Optional: true,
 				Default:  "dualstack",
 			},
-			"ipv6_address": {
-				Type:       schema.TypeString,
-				Computed:   true,
-				Deprecated: "use `ipv6_addresses` attribute instead",
-			},
 			"ipv6_addresses": {
 				Type:     schema.TypeList,
 				Computed: true,
@@ -261,11 +256,6 @@ func resourceInstanceRead(ctx context.Context, d *schema.ResourceData, meta inte
 	d.Set("cpu_count", out.Hardware.CpuCount)
 	d.Set("ram_size", out.Hardware.RamSizeInGb)
 
-	// Deprecated: AWS Go SDK v1.36.25 removed Ipv6Address field
-	if len(out.Ipv6Addresses) > 0 {
-		d.Set("ipv6_address", out.Ipv6Addresses[0])
-	}
-
 	d.Set("ipv6_addresses", aws.StringValueSlice(out.Ipv6Addresses))
 	d.Set("ip_address_type", out.IpAddressType)
 	d.Set("is_static_ip", out.IsStaticIp)
diff --git a/internal/service/lightsail/instance_test.go b/internal/service/lightsail/instance_test.go
index 1297ac4cb75..4caf213e04a 100644
--- a/internal/service/lightsail/instance_test.go
+++ b/internal/service/lightsail/instance_test.go
@@ -50,8 +50,8 @@ func TestAccLightsailInstance_basic(t *testing.T) {
 					resource.TestCheckResourceAttrSet(resourceName, "availability_zone"),
 					resource.TestCheckResourceAttrSet(resourceName, "blueprint_id"),
 					resource.TestCheckResourceAttrSet(resourceName, "bundle_id"),
-					resource.TestMatchResourceAttr(resourceName, "ipv6_address", regexp.MustCompile(`([a-f0-9]{1,4}:){7}[a-f0-9]{1,4}`)),
 					resource.TestCheckResourceAttr(resourceName, "ipv6_addresses.#", "1"),
+					resource.TestMatchResourceAttr(resourceName, "ipv6_addresses.0", regexp.MustCompile(`([a-f0-9]{1,4}:){7}[a-f0-9]{1,4}`)),
 					resource.TestCheckResourceAttrSet(resourceName, "key_pair_name"),
 					resource.TestCheckResourceAttr(resourceName, "tags.%", "0"),
 					resource.TestMatchResourceAttr(resourceName, "ram_size", regexp.MustCompile(`\d+(.\d+)?`)),
diff --git a/website/docs/guides/version-5-upgrade.html.md b/website/docs/guides/version-5-upgrade.html.md
index 1b4b5ec5037..ba34d6f044b 100644
--- a/website/docs/guides/version-5-upgrade.html.md
+++ b/website/docs/guides/version-5-upgrade.html.md
@@ -37,6 +37,7 @@ Upgrade topics:
 - [Resource: aws_ec2_client_vpn_endpoint](#resource-aws_ec2_client_vpn_endpoint)
 - [Resource: aws_ec2_client_vpn_network_association](#resource-aws_ec2_client_vpn_network_association)
 - [Resource: aws_ecs_cluster](#resource-aws_ecs_cluster)
+- [Resource: aws_lightsail_instance](#resource-aws_lightsail_instance)
 - [Resource: aws_msk_cluster](#resource-aws_msk_cluster)
 - [Resource: aws_neptune_cluster](#resource-aws_neptune_cluster)
 - [Resource: aws_rds_cluster](#resource-aws_rds_cluster)
@@ -158,6 +159,10 @@ The `status` attribute has been removed.
 
 The `capacity_providers` and `default_capacity_provider_strategy` attributes have been removed.
 
+## Resource: aws_lightsail_instance
+
+The `ipv6_address` attribute has been removed.
+
 ## Resource: aws_msk_cluster
 
 The `broker_node_group_info.ebs_volume_size` attribute has been removed.
diff --git a/website/docs/r/lightsail_instance.html.markdown b/website/docs/r/lightsail_instance.html.markdown
index 146b9029c9a..c9b1ae4bdbc 100644
--- a/website/docs/r/lightsail_instance.html.markdown
+++ b/website/docs/r/lightsail_instance.html.markdown
@@ -150,7 +150,6 @@ In addition to all arguments above, the following attributes are exported:
 * `created_at` - The timestamp when the instance was created.
 * `cpu_count` - The number of vCPUs the instance has.
 * `ram_size` - The amount of RAM in GB on the instance (e.g., 1.0).
-* `ipv6_address` - (**Deprecated**) The first IPv6 address of the Lightsail instance. Use `ipv6_addresses` attribute instead.
 * `ipv6_addresses` - List of IPv6 addresses for the Lightsail instance.
 * `private_ip_address` - The private IP address of the instance.
 * `public_ip_address` - The public IP address of the instance.