diff --git a/mmv1/products/pubsub/Schema.yaml b/mmv1/products/pubsub/Schema.yaml
index 68203f4981da..fa75c9812fc0 100644
--- a/mmv1/products/pubsub/Schema.yaml
+++ b/mmv1/products/pubsub/Schema.yaml
@@ -13,7 +13,6 @@
 
 --- !ruby/object:Api::Resource
 name: 'Schema'
-immutable: true
 description: |
   A schema is a format that messages must follow,
   creating a contract between publisher and subscriber that Pub/Sub will enforce.
@@ -23,6 +22,9 @@ references: !ruby/object:Api::Resource::ReferenceLinks
   api: 'https://cloud.google.com/pubsub/docs/reference/rest/v1/projects.schemas'
 base_url: projects/{{project}}/schemas
 create_url: projects/{{project}}/schemas?schemaId={{name}}
+update_url: projects/{{project}}/schemas/{{name}}:commit
+update_verb: :POST
+update_mask: false
 async: !ruby/object:Provider::Terraform::PollAsync
   check_response_func_existence: PollCheckForExistence
   check_response_func_absence: PollCheckForAbsence
@@ -52,6 +54,8 @@ parameters:
     diff_suppress_func: 'tpgresource.CompareSelfLinkOrResourceName'
     custom_expand: templates/terraform/custom_expand/resource_from_self_link.go.erb
     custom_flatten: templates/terraform/custom_flatten/name_from_self_link.erb
+custom_code: !ruby/object:Provider::Terraform::CustomCode
+  update_encoder: templates/terraform/update_encoder/pubsub_schema.erb
 properties:
   - !ruby/object:Api::Type::Enum
     name: 'type'
@@ -67,5 +71,3 @@ properties:
       The definition of the schema.
       This should contain a string representing the full definition of the schema
       that is a valid schema definition of the type specified in type.
-
-    ignore_read: true
diff --git a/mmv1/templates/terraform/update_encoder/pubsub_schema.erb b/mmv1/templates/terraform/update_encoder/pubsub_schema.erb
new file mode 100644
index 000000000000..2e1efb5be55c
--- /dev/null
+++ b/mmv1/templates/terraform/update_encoder/pubsub_schema.erb
@@ -0,0 +1,19 @@
+<%# The license inside this block applies to this file.
+	# Copyright 2023 Google Inc.
+	# Licensed under the Apache License, Version 2.0 (the "License");
+	# you may not use this file except in compliance with the License.
+	# You may obtain a copy of the License at
+	#
+	#     http://www.apache.org/licenses/LICENSE-2.0
+	#
+	# Unless required by applicable law or agreed to in writing, software
+	# distributed under the License is distributed on an "AS IS" BASIS,
+	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+	# See the License for the specific language governing permissions and
+	# limitations under the License.
+-%>
+	newObj := make(map[string]interface{})
+	newObj["name"] = d.Id()
+	obj["name"] = d.Id()
+	newObj["schema"] = obj
+	return newObj, nil
diff --git a/mmv1/third_party/terraform/tests/resource_pubsub_schema_test.go b/mmv1/third_party/terraform/tests/resource_pubsub_schema_test.go
new file mode 100644
index 000000000000..e8131d5cf080
--- /dev/null
+++ b/mmv1/third_party/terraform/tests/resource_pubsub_schema_test.go
@@ -0,0 +1,84 @@
+package google
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
+	"github.com/hashicorp/terraform-provider-google/google/acctest"
+)
+
+func TestAccPubsubSchema_update(t *testing.T) {
+	t.Parallel()
+
+	schema := fmt.Sprintf("tf-test-schema-%s", RandString(t, 10))
+
+	VcrTest(t, resource.TestCase{
+		PreCheck:                 func() { acctest.AccTestPreCheck(t) },
+		ProtoV5ProviderFactories: ProtoV5ProviderFactories(t),
+		CheckDestroy:             testAccCheckPubsubSubscriptionDestroyProducer(t),
+		ExternalProviders: map[string]resource.ExternalProvider{
+			"time": {},
+		},
+		Steps: []resource.TestStep{
+			{
+				Config: testAccPubsubSchema_basic(schema),
+			},
+			{
+				ResourceName:      "google_pubsub_schema.foo",
+				ImportState:       true,
+				ImportStateVerify: true,
+			},
+			{
+				Config: testAccPubsubSchema_updated(schema),
+			},
+			{
+				ResourceName:      "google_pubsub_schema.foo",
+				ImportState:       true,
+				ImportStateVerify: true,
+			},
+		},
+	})
+}
+
+func testAccPubsubSchema_basic(schema string) string {
+	return fmt.Sprintf(`
+	resource "google_pubsub_schema" "foo" {
+		name = "%s"
+		type = "PROTOCOL_BUFFER"
+		definition = "syntax = \"proto3\";\nmessage Results {\nstring message_request = 1;\nstring message_response = 2;\n}"
+	}
+
+	# Need to introduce delay for updates in order for tests to complete
+	# successfully due to caching effects.
+	resource "time_sleep" "wait_121_seconds" {
+		create_duration = "121s"
+		lifecycle {
+			replace_triggered_by = [
+				google_pubsub_schema.foo
+			]
+		}
+	}
+`, schema)
+}
+
+func testAccPubsubSchema_updated(schema string) string {
+	return fmt.Sprintf(`
+	resource "google_pubsub_schema" "foo" {
+		name = "%s"
+		type = "PROTOCOL_BUFFER"
+		definition = "syntax = \"proto3\";\nmessage Results {\nstring message_request = 1;\nstring message_response = 2;\nstring timestamp_request = 3;\n}"
+	}
+
+	# Need to introduce delay for updates in order for tests to complete
+	# successfully due to caching effects.
+	resource "time_sleep" "wait_121_seconds" {
+		create_duration = "121s"
+		lifecycle {
+			replace_triggered_by = [
+				google_pubsub_schema.foo
+			]
+		}
+	}
+`, schema)
+}