diff --git a/.changelog/9561.txt b/.changelog/9561.txt
new file mode 100644
index 00000000000..07f5370f900
--- /dev/null
+++ b/.changelog/9561.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+logging: value change of `unique_writer_identity` on `google_logging_project_sink` does not trigger diff on dependent's usages of `writer_identity`
+```
diff --git a/google/services/logging/resource_logging_project_sink.go b/google/services/logging/resource_logging_project_sink.go
index 7d29ba2c3de..f61bcb1422f 100644
--- a/google/services/logging/resource_logging_project_sink.go
+++ b/google/services/logging/resource_logging_project_sink.go
@@ -96,10 +96,19 @@ func resourceLoggingProjectSinkAcquireOrCreate(d *schema.ResourceData, meta inte
 	return resourceLoggingProjectSinkUpdate(d, meta)
 }
 
-// if bigquery_options is set unique_writer_identity must be true
+// 1) if bigquery_options is set unique_writer_identity must be true
+// 2) taint the value of writer_identity when unique_writer_identity is updating from false -> true
 func resourceLoggingProjectSinkCustomizeDiff(ctx context.Context, d *schema.ResourceDiff, meta interface{}) error {
 	// separate func to allow unit testing
-	return resourceLoggingProjectSinkCustomizeDiffFunc(d)
+	err := resourceLoggingProjectSinkCustomizeDiffFunc(d)
+	if err != nil {
+		return err
+	}
+	err = resourceLoggingProjectSinkUniqueWriterIdentityCustomizeDiffFunc(d)
+	if err != nil {
+		return err
+	}
+	return nil
 }
 
 func resourceLoggingProjectSinkCustomizeDiffFunc(diff tpgresource.TerraformResourceDiff) error {
@@ -117,6 +126,20 @@ func resourceLoggingProjectSinkCustomizeDiffFunc(diff tpgresource.TerraformResou
 	return nil
 }
 
+func resourceLoggingProjectSinkUniqueWriterIdentityCustomizeDiffFunc(diff *schema.ResourceDiff) error {
+	if !diff.HasChange("unique_writer_identity") {
+		return nil
+	}
+	// taint the value of writer_identity when unique_writer_identity is updating from false -> true
+	if diff.Get("unique_writer_identity").(bool) {
+		err := diff.SetNewComputed("writer_identity")
+		if err != nil {
+			return fmt.Errorf("Error re-setting writer_identity: %s", err)
+		}
+	}
+	return nil
+}
+
 func resourceLoggingProjectSinkRead(d *schema.ResourceData, meta interface{}) error {
 	config := meta.(*transport_tpg.Config)
 	userAgent, err := tpgresource.GenerateUserAgentString(d, config.UserAgent)