diff --git a/README.md b/README.md
index 3b308f2..e5e39c1 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ Copy over the protobuf files under [temporal](temporal) directory to the project
 
 ### API Version
 
-The client is expected to pass in a `temporal-cloud-api-version` header with the api version identifier with every request it makes to the apis. The backend will use the version to safely mutate resources.
+The client is expected to pass in a `temporal-cloud-api-version` header with the api version identifier with every request it makes to the apis. The backend will use the version to safely mutate resources. The `temporal:versioning:min_version` label indicates the minimun version of the API required to use the field.
 
 Current Version:
 
diff --git a/VERSION b/VERSION
index f69cc61..b54cee0 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2023-10-01-00
+2024-05-13-00
diff --git a/buf.yaml b/buf.yaml
index 69baf0f..3edc46e 100644
--- a/buf.yaml
+++ b/buf.yaml
@@ -3,7 +3,7 @@ deps:
   - buf.build/googleapis/googleapis
 breaking:
   use:
-    - FILE
+    - WIRE
 lint:
   use:
     - DEFAULT
diff --git a/temporal/api/cloud/namespace/v1/message.proto b/temporal/api/cloud/namespace/v1/message.proto
index 74edd29..10df250 100644
--- a/temporal/api/cloud/namespace/v1/message.proto
+++ b/temporal/api/cloud/namespace/v1/message.proto
@@ -36,6 +36,16 @@ message MtlsAuthSpec {
     // This allows limiting access to specific end-entity certificates.
     // Optional, default is empty.
     repeated CertificateFilterSpec certificate_filters = 2;
+    // Flag to enable mTLS auth (default: disabled).
+    // Note: disabling mTLS auth will cause existing mTLS connections to fail.
+    // temporal:versioning:min_version=2024-05-13-00
+    bool enabled = 3;
+}
+
+message ApiKeyAuthSpec {
+    // Flag to enable API key auth (default: disabled).
+    // Note: disabling API key auth will cause existing API key connections to fail.
+    bool enabled = 1;
 }
 
 message CodecServerSpec {
@@ -56,15 +66,20 @@ message NamespaceSpec {
     // Specifying more than one region makes the namespace "global", which is currently a preview only feature with restricted access.
     // Please reach out to Temporal support for more information on global namespaces.
     // When provisioned the global namespace will be active on the first region in the list and passive on the rest.
-    // Number of supported regions is 2. 
+    // Number of supported regions is 2.
     // The regions is immutable. Once set, it cannot be changed.
     repeated string regions = 2;
     // The number of days the workflows data will be retained for.
     // Changes to the retention period may impact your storage costs.
     // Any changes to the retention period will be applied to all new running workflows.
     int32 retention_days = 3;
-    // The mtls authentication and authorization to enforce on the namespace.
+    // The mTLS auth configuration for the namespace.
+    // If unspecified, mTLS will be disabled.
     MtlsAuthSpec mtls_auth = 4;
+    // The API key auth configuration for the namespace.
+    // If unspecified, API keys will be disabled.
+    // temporal:versioning:min_version=2024-05-13-00
+    ApiKeyAuthSpec api_key_auth = 7;
     // The custom search attributes to use for the namespace.
     // The name of the attribute is the key and the type is the value.
     // Supported attribute types: text, keyword, int, double, bool, datetime, keyword_list.
@@ -77,10 +92,12 @@ message NamespaceSpec {
 }
 
 message Endpoints {
-    // The web ui address.
+    // The web UI address.
     string web_address = 1;
-    // The grpc hostport address that the temporal workers, clients and tctl connect to.
-    string grpc_address = 2;
+    // The gRPC address for mTLS client connections (may be empty if mTLS is disabled).
+    string mtls_grpc_address = 2;
+    // The gRPC address for API key client connections (may be empty if API keys are disabled).
+    string grpc_address = 3;
 }
 
 message Limits {