diff --git a/temporal/api/command/v1/message.proto b/temporal/api/command/v1/message.proto
index 65e0a53e..2e9fe4a8 100644
--- a/temporal/api/command/v1/message.proto
+++ b/temporal/api/command/v1/message.proto
@@ -236,6 +236,7 @@ message Command {
         StartChildWorkflowExecutionCommandAttributes start_child_workflow_execution_command_attributes = 12;
         SignalExternalWorkflowExecutionCommandAttributes signal_external_workflow_execution_command_attributes = 13;
         UpsertWorkflowSearchAttributesCommandAttributes upsert_workflow_search_attributes_command_attributes = 14;
+        // 15 and 16 are available for use - they were used as part of a prototype that never made it into a release
         ModifyWorkflowPropertiesCommandAttributes modify_workflow_properties_command_attributes = 17;
     }
 }
diff --git a/temporal/api/protocol/v1/message.proto b/temporal/api/protocol/v1/message.proto
index c852b0b2..ce6c560d 100644
--- a/temporal/api/protocol/v1/message.proto
+++ b/temporal/api/protocol/v1/message.proto
@@ -28,16 +28,26 @@ option go_package = "go.temporal.io/api/protocol/v1;messaging";
 option java_package = "io.temporal.api.protocol.v1";
 option java_multiple_files = true;
 option java_outer_classname = "MessageProto";
-option ruby_package = "Temporal::Api::Protocol::V1";
-option csharp_namespace = "Temporal.Api.Protocol.V1";
+option ruby_package = "Temporalio::Api::Protocol::V1";
+option csharp_namespace = "Temporalt.Api.Protocol.V1";
 
 import "google/protobuf/any.proto";
 
 // (-- api-linter: core::0146::any=disabled
 //     aip.dev/not-precedent: We want runtime extensibility for the body field --)
 message Message {
+    // An ID for this specific message.
     string id = 1;
+
+    // Identifies the specific instance of a protocol to which this message
+    // belongs.
     string protocol_id = 2;
+
+    // The event ID or command ID after which this message can be delivered. The
+    // effects of history up to and including this event ID should be visible to
+    // the code that handles this message. Set to -1 to opt out of sequencing.
+    int64 sequencing_id = 3;
     
-    google.protobuf.Any body = 3;
+    // The opaque data carried by this message.
+    google.protobuf.Any body = 4;
 }
diff --git a/temporal/api/update/v1/message.proto b/temporal/api/update/v1/message.proto
index e0a831c7..9c650f5a 100644
--- a/temporal/api/update/v1/message.proto
+++ b/temporal/api/update/v1/message.proto
@@ -28,8 +28,8 @@ option go_package = "go.temporal.io/api/update/v1;update";
 option java_package = "io.temporal.api.update.v1";
 option java_multiple_files = true;
 option java_outer_classname = "MessageProto";
-option ruby_package = "Temporal::Api::Update::V1";
-option csharp_namespace = "Temporal.Api.Update.V1";
+option ruby_package = "Temporalio::Api::Update::V1";
+option csharp_namespace = "Temporalio.Api.Update.V1";
 
 import "temporal/api/common/v1/message.proto";
 import "temporal/api/enums/v1/update.proto";
@@ -91,20 +91,6 @@ message Request {
     Input input = 2;
 }
 
-// An update protocol message that invokes a given workflow execution update
-// handler. This type differs from Request only in that it carries event ID
-// sequencing information.
-message Invocation {
-    Meta meta = 1;
-
-    // The event ID after which this update can execute. The effects of
-    // history up to and including this event ID should be visible to the
-    // update when it executes.
-    int64 sequencing_event_id = 2;
-
-    Input input = 3;
-}
-
 // An update protocol message indicating that a workflow execution update has
 // been rejected.
 message Rejection {
diff --git a/temporal/api/workflowservice/v1/request_response.proto b/temporal/api/workflowservice/v1/request_response.proto
index 88105e1e..e95424b6 100644
--- a/temporal/api/workflowservice/v1/request_response.proto
+++ b/temporal/api/workflowservice/v1/request_response.proto
@@ -1056,27 +1056,24 @@ message GetWorkerBuildIdOrderingResponse {
 // (-- api-linter: core::0134=disabled
 //     aip.dev/not-precedent: Update RPCs don't follow Google API format. --)
 message UpdateWorkflowExecutionRequest {
-    // A unique ID for this update
-    string update_id = 1;
-
     // The namespace name of the target workflow
-    string namespace = 2;
+    string namespace = 1;
     // The target workflow id and (optionally) a specific run thereof
     // (-- api-linter: core::0203::optional=disabled
     //     aip.dev/not-precedent: false positive triggered by the word "optional" --)
-    temporal.api.common.v1.WorkflowExecution workflow_execution = 3;
+    temporal.api.common.v1.WorkflowExecution workflow_execution = 2;
     // If set, this call will error if the most recent (if no run id is set on
     // `workflow_execution`), or specified (if it is) workflow execution is not
     // part of the same execution chain as this id.
-    string first_execution_run_id = 4;
+    string first_execution_run_id = 3;
 
     // Describes when this request should return - basically whether the
     // update is synchronous, asynchronous, or somewhere in between.
-    temporal.api.update.v1.WaitPolicy wait_policy = 5;
+    temporal.api.update.v1.WaitPolicy wait_policy = 4;
 
     // The name under which the workflow update function is registered and the
     // arguments to pass to said function.
-    temporal.api.update.v1.Request request = 6;
+    temporal.api.update.v1.Request request = 5;
 }
 
 message UpdateWorkflowExecutionResponse {