diff --git a/.changelog/8840.txt b/.changelog/8840.txt
new file mode 100644
index 00000000000..8594f7d7393
--- /dev/null
+++ b/.changelog/8840.txt
@@ -0,0 +1,3 @@
+```release-note:enhancement
+compute: added update support for `enable_proxy_protocol` to`google_compute_service_attachment` resource
+```
diff --git a/google/services/compute/resource_compute_service_attachment.go b/google/services/compute/resource_compute_service_attachment.go
index 7a225d3fd6f..11ba0808028 100644
--- a/google/services/compute/resource_compute_service_attachment.go
+++ b/google/services/compute/resource_compute_service_attachment.go
@@ -56,7 +56,6 @@ values include "ACCEPT_AUTOMATIC", "ACCEPT_MANUAL".`,
 			"enable_proxy_protocol": {
 				Type:     schema.TypeBool,
 				Required: true,
-				ForceNew: true,
 				Description: `If true, enable the proxy protocol which is for supplying client TCP/IP
 address data in TCP connections that traverse proxies on their way to
 destination servers.`,
@@ -458,6 +457,12 @@ func resourceComputeServiceAttachmentUpdate(d *schema.ResourceData, meta interfa
 	} else if v, ok := d.GetOkExists("nat_subnets"); ok || !reflect.DeepEqual(v, natSubnetsProp) {
 		obj["natSubnets"] = natSubnetsProp
 	}
+	enableProxyProtocolProp, err := expandComputeServiceAttachmentEnableProxyProtocol(d.Get("enable_proxy_protocol"), d, config)
+	if err != nil {
+		return err
+	} else if v, ok := d.GetOkExists("enable_proxy_protocol"); !tpgresource.IsEmptyValue(reflect.ValueOf(v)) && (ok || !reflect.DeepEqual(v, enableProxyProtocolProp)) {
+		obj["enableProxyProtocol"] = enableProxyProtocolProp
+	}
 	consumerRejectListsProp, err := expandComputeServiceAttachmentConsumerRejectLists(d.Get("consumer_reject_lists"), d, config)
 	if err != nil {
 		return err
diff --git a/google/services/compute/resource_compute_service_attachment_test.go b/google/services/compute/resource_compute_service_attachment_test.go
index 2d3fc9304c4..d4db972300b 100644
--- a/google/services/compute/resource_compute_service_attachment_test.go
+++ b/google/services/compute/resource_compute_service_attachment_test.go
@@ -31,7 +31,16 @@ func TestAccComputeServiceAttachment_serviceAttachmentBasicExampleUpdate(t *test
 				ImportStateVerifyIgnore: []string{"target_service", "region"},
 			},
 			{
-				Config: testAccComputeServiceAttachment_serviceAttachmentBasicExampleUpdate(context),
+				Config: testAccComputeServiceAttachment_serviceAttachmentBasicExampleUpdate(context, true),
+			},
+			{
+				ResourceName:            "google_compute_service_attachment.psc_ilb_service_attachment",
+				ImportState:             true,
+				ImportStateVerify:       true,
+				ImportStateVerifyIgnore: []string{"target_service", "region"},
+			},
+			{
+				Config: testAccComputeServiceAttachment_serviceAttachmentBasicExampleUpdate(context, false),
 			},
 			{
 				ResourceName:            "google_compute_service_attachment.psc_ilb_service_attachment",
@@ -50,7 +59,7 @@ resource "google_compute_service_attachment" "psc_ilb_service_attachment" {
   region      = "us-west2"
   description = "A service attachment configured with Terraform"
 
-  enable_proxy_protocol    = true
+  enable_proxy_protocol    = false
   connection_preference    = "ACCEPT_AUTOMATIC"
   nat_subnets              = [google_compute_subnetwork.psc_ilb_nat.id]
   target_service           = google_compute_forwarding_rule.psc_ilb_target_service.id
@@ -126,7 +135,15 @@ resource "google_compute_subnetwork" "psc_ilb_nat" {
 `, context)
 }
 
-func testAccComputeServiceAttachment_serviceAttachmentBasicExampleUpdate(context map[string]interface{}) string {
+func testAccComputeServiceAttachment_serviceAttachmentBasicExampleUpdate(context map[string]interface{}, preventDestroy bool) string {
+	context["lifecycle_block"] = ""
+	if preventDestroy {
+		context["lifecycle_block"] = `
+		lifecycle {
+			prevent_destroy = true
+		}`
+	}
+
 	return acctest.Nprintf(`
 resource "google_compute_service_attachment" "psc_ilb_service_attachment" {
   name        = "tf-test-my-psc-ilb%{random_suffix}"
@@ -143,8 +160,8 @@ resource "google_compute_service_attachment" "psc_ilb_service_attachment" {
     project_id_or_num = "658859330310"
     connection_limit  = 4
   }
-
   reconcile_connections = false
+  %{lifecycle_block}
 }
 
 resource "google_compute_address" "psc_ilb_consumer_address" {