diff --git a/VERSION_OMICRON b/VERSION_OMICRON
index 2845ca0..56a1549 100644
--- a/VERSION_OMICRON
+++ b/VERSION_OMICRON
@@ -1 +1 @@
-e036c80
\ No newline at end of file
+b537d4e
diff --git a/internal/generate/main.go b/internal/generate/main.go
index fc72cf1..0239baf 100644
--- a/internal/generate/main.go
+++ b/internal/generate/main.go
@@ -9,6 +9,7 @@ import (
 	"net/url"
 	"os"
 	"path/filepath"
+	"strings"
 
 	"github.com/getkin/kin-openapi/openapi3"
 )
@@ -58,7 +59,7 @@ func loadAPIFromFile(file string) (*openapi3.T, error) {
 	if err != nil {
 		return nil, fmt.Errorf("error retrieving Omicron version: %v", err)
 	}
-	ov := string(omicronVersion)
+	ov := strings.TrimSpace(string(omicronVersion))
 
 	// TODO: actually host the spec here.
 	// uri := "https://api.oxide.computer"
diff --git a/oxide/paths.go b/oxide/paths.go
index 2b571f5..6f1df8e 100644
--- a/oxide/paths.go
+++ b/oxide/paths.go
@@ -8286,7 +8286,7 @@ func (c *Client) NetworkingSwitchPortSettingsListAllPages(ctx context.Context, p
 }
 
 // NetworkingSwitchPortSettingsCreate: Create switch port settings
-func (c *Client) NetworkingSwitchPortSettingsCreate(ctx context.Context, params NetworkingSwitchPortSettingsCreateParams) (*SwitchPortSettingsView, error) {
+func (c *Client) NetworkingSwitchPortSettingsCreate(ctx context.Context, params NetworkingSwitchPortSettingsCreateParams) (*SwitchPortSettingsWithChecksum, error) {
 	if err := params.Validate(); err != nil {
 		return nil, err
 	}
@@ -8326,7 +8326,7 @@ func (c *Client) NetworkingSwitchPortSettingsCreate(ctx context.Context, params
 		return nil, errors.New("request returned an empty body in the response")
 	}
 
-	var body SwitchPortSettingsView
+	var body SwitchPortSettingsWithChecksum
 	if err := json.NewDecoder(resp.Body).Decode(&body); err != nil {
 		return nil, fmt.Errorf("error decoding response body: %v", err)
 	}
@@ -8371,7 +8371,7 @@ func (c *Client) NetworkingSwitchPortSettingsDelete(ctx context.Context, params
 }
 
 // NetworkingSwitchPortSettingsView: Get information about switch port
-func (c *Client) NetworkingSwitchPortSettingsView(ctx context.Context, params NetworkingSwitchPortSettingsViewParams) (*SwitchPortSettingsView, error) {
+func (c *Client) NetworkingSwitchPortSettingsView(ctx context.Context, params NetworkingSwitchPortSettingsViewParams) (*SwitchPortSettingsWithChecksum, error) {
 	if err := params.Validate(); err != nil {
 		return nil, err
 	}
@@ -8407,7 +8407,7 @@ func (c *Client) NetworkingSwitchPortSettingsView(ctx context.Context, params Ne
 		return nil, errors.New("request returned an empty body in the response")
 	}
 
-	var body SwitchPortSettingsView
+	var body SwitchPortSettingsWithChecksum
 	if err := json.NewDecoder(resp.Body).Decode(&body); err != nil {
 		return nil, fmt.Errorf("error decoding response body: %v", err)
 	}
diff --git a/oxide/types.go b/oxide/types.go
index 92b3b14..7c08837 100644
--- a/oxide/types.go
+++ b/oxide/types.go
@@ -5561,8 +5561,23 @@ type SwitchPortAddressConfig struct {
 // Required fields:
 // - PortSettings
 type SwitchPortApplySettings struct {
-	// PortSettings is a name or id to use when applying switch port settings.
-	PortSettings NameOrId `json:"port_settings,omitempty" yaml:"port_settings,omitempty"`
+	// PortSettings is name or ID of the desired configuration
+	PortSettings NameOrId                         `json:"port_settings,omitempty" yaml:"port_settings,omitempty"`
+	Precondition SwitchPortApplySettingsChecksums `json:"precondition,omitempty" yaml:"precondition,omitempty"`
+}
+
+// SwitchPortApplySettingsChecksums is parameters for applying a precondition to SwitchPortApplySettings
+//
+// Required fields:
+// - NewSettingsChecksum
+type SwitchPortApplySettingsChecksums struct {
+	// CurrentSettingsChecksum is md5 checksum of current SwitchPortApplySettings body This field protects against
+	// concurrent modification of `SwitchPortApplySettings` Set to `None` if you expect there to not be any settings
+	// currently applied.
+	CurrentSettingsChecksum string `json:"current_settings_checksum,omitempty" yaml:"current_settings_checksum,omitempty"`
+	// NewSettingsChecksum is md5 checksum of the desired configuration body This field ensures that the port
+	// settings you are applying have not been modified since you last viewed them
+	NewSettingsChecksum string `json:"new_settings_checksum,omitempty" yaml:"new_settings_checksum,omitempty"`
 }
 
 // SwitchPortConfig is a physical port configuration for a port settings object.
@@ -5707,6 +5722,8 @@ type SwitchPortSettingsCreate struct {
 	Name Name `json:"name,omitempty" yaml:"name,omitempty"`
 	// PortConfig is physical switch port configuration.
 	PortConfig SwitchPortConfigCreate `json:"port_config,omitempty" yaml:"port_config,omitempty"`
+	// Precondition is optional checksum to provide for detecting conflicting concurrent updates
+	Precondition string `json:"precondition,omitempty" yaml:"precondition,omitempty"`
 	// Routes is routes indexed by interface name.
 	Routes RouteConfig `json:"routes,omitempty" yaml:"routes,omitempty"`
 }
@@ -5776,6 +5793,18 @@ type SwitchPortSettingsView struct {
 	VlanInterfaces []SwitchVlanInterfaceConfig `json:"vlan_interfaces,omitempty" yaml:"vlan_interfaces,omitempty"`
 }
 
+// SwitchPortSettingsWithChecksum is the type definition for a SwitchPortSettingsWithChecksum.
+//
+// Required fields:
+// - Checksum
+// - Value
+type SwitchPortSettingsWithChecksum struct {
+	// Checksum is checksum of value to use for concurrency control
+	Checksum string `json:"checksum,omitempty" yaml:"checksum,omitempty"`
+	// Value is value of response
+	Value SwitchPortSettingsView `json:"value,omitempty" yaml:"value,omitempty"`
+}
+
 // SwitchResultsPage is a single page of results
 //
 // Required fields: