diff --git a/pkg/deployments/deployment.go b/pkg/deployments/deployment.go
index af0230e0..10cb51c2 100644
--- a/pkg/deployments/deployment.go
+++ b/pkg/deployments/deployment.go
@@ -27,6 +27,7 @@ type Deployment struct {
 	FormValues               map[string]string          `json:"FormValues,omitempty"`
 	ManifestVariableSetID    string                     `json:"ManifestVariableSetId,omitempty"`
 	Name                     string                     `json:"Name,omitempty"`
+	Priority                 string                     `json:"Priority,omitempty" validate:"oneof=On Off LifecycleDefault"`
 	ProjectID                string                     `json:"ProjectId,omitempty"`
 	QueueTime                *time.Time                 `json:"QueueTime,omitempty"`
 	QueueTimeExpiry          *time.Time                 `json:"QueueTimeExpiry,omitempty"`
@@ -49,6 +50,7 @@ func NewDeployment(environmentID string, releaseID string) *Deployment {
 		EnvironmentID: environmentID,
 		ReleaseID:     releaseID,
 		Resource:      *resources.NewResource(),
+		Priority:      "LifecycleDefault",
 	}
 }
 
diff --git a/pkg/lifecycles/lifecycle_test.go b/pkg/lifecycles/lifecycle_test.go
index e94a88ef..4e5cf716 100644
--- a/pkg/lifecycles/lifecycle_test.go
+++ b/pkg/lifecycles/lifecycle_test.go
@@ -30,6 +30,7 @@ func TestLifecycleAsJSON(t *testing.T) {
 	lifecycle.Phases[1].ID = "test-phase-id-2"
 	lifecycle.Phases[1].ReleaseRetentionPolicy = nil
 	lifecycle.Phases[1].TentacleRetentionPolicy = nil
+	lifecycle.Phases[1].IsPriorityPhase = true
 	lifecycle.TentacleRetentionPolicy.Unit = "Items"
 
 	lifecycle.ReleaseRetentionPolicy.QuantityToKeep = 3
@@ -44,6 +45,7 @@ func TestLifecycleAsJSON(t *testing.T) {
 				"AutomaticDeploymentTargets": ["test-AutomaticDeploymentTargets-1"],
 				"Id": "test-phase-id-1",
 				"IsOptionalPhase": true,
+				"IsPriorityPhase": false,
 				"MinimumEnvironmentsBeforePromotion": 123,
 				"Name": "test-phase-name-1",
 				"OptionalDeploymentTargets": ["Environments-1"],
@@ -65,6 +67,7 @@ func TestLifecycleAsJSON(t *testing.T) {
 				"OptionalDeploymentTargets": [],
 				"MinimumEnvironmentsBeforePromotion": 0,
 				"IsOptionalPhase": false,
+				"IsPriorityPhase": true,
 				"ReleaseRetentionPolicy": null,
 				"TentacleRetentionPolicy": null
 			}
@@ -206,6 +209,7 @@ func TestLifecycleFromJson(t *testing.T) {
       ],
       "MinimumEnvironmentsBeforePromotion": 1,
       "IsOptionalPhase": true,
+      "IsPriorityPhase": false,
       "ReleaseRetentionPolicy": {
         "Unit": "Days",
         "QuantityToKeep": 1,
@@ -256,6 +260,7 @@ func TestLifecycleFromJson(t *testing.T) {
 	require.Equal(t, "A", phase0.Name)
 	require.Equal(t, int32(1), phase0.MinimumEnvironmentsBeforePromotion)
 	require.Equal(t, true, phase0.IsOptionalPhase)
+	require.Equal(t, false, phase0.IsPriorityPhase)
 	require.Equal(t, 1, len(phase0.AutomaticDeploymentTargets))
 	require.Equal(t, "Environments-2", phase0.AutomaticDeploymentTargets[0])
 	require.Equal(t, 1, len(phase0.OptionalDeploymentTargets))
diff --git a/pkg/lifecycles/phase.go b/pkg/lifecycles/phase.go
index 2124e673..9af78610 100644
--- a/pkg/lifecycles/phase.go
+++ b/pkg/lifecycles/phase.go
@@ -6,6 +6,7 @@ type Phase struct {
 	AutomaticDeploymentTargets         []string              `json:"AutomaticDeploymentTargets"`
 	ID                                 string                `json:"Id,omitempty"`
 	IsOptionalPhase                    bool                  `json:"IsOptionalPhase"`
+	IsPriorityPhase                    bool                  `json:"IsPriorityPhase"`
 	MinimumEnvironmentsBeforePromotion int32                 `json:"MinimumEnvironmentsBeforePromotion"`
 	Name                               string                `json:"Name" validate:"required"`
 	OptionalDeploymentTargets          []string              `json:"OptionalDeploymentTargets"`
diff --git a/test/e2e/lifecycle_service_test.go b/test/e2e/lifecycle_service_test.go
index 880fae35..c464a63b 100644
--- a/test/e2e/lifecycle_service_test.go
+++ b/test/e2e/lifecycle_service_test.go
@@ -254,6 +254,29 @@ func TestLifecycleAddGetAndDelete_NewClient(t *testing.T) {
 	assert.Equal(t, lifecycle.Name, getLifecycle.Name)
 }
 
+func TestLifecycleAddGetUpdateAndDeleteWithPhases_NewClient(t *testing.T) {
+	octopusClient := getOctopusClient()
+	require.NotNil(t, octopusClient)
+
+	lifecycle := createTestLifecycle_NewClient(t, octopusClient, internal.GetRandomName())
+	defer cleanLifecycle_NewClient(t, octopusClient, lifecycle)
+
+	priorityPhase := lifecycles.NewPhase(internal.GetRandomName())
+	priorityPhase.IsPriorityPhase = true
+
+	lifecycle.Phases = append(lifecycle.Phases, priorityPhase)
+	updatedLifecycle, err := lifecycles.Update(octopusClient, lifecycle)
+
+	assert.NoError(t, err, "there was an error when updating the lifecycle")
+	require.NotNil(t, updatedLifecycle)
+
+	getLifecycle, err := lifecycles.GetByID(octopusClient, lifecycle.SpaceID, lifecycle.GetID())
+	assert.NoError(t, err, "there was an error raised getting lifecycle when there should not be")
+	assert.Equal(t, lifecycle.Name, getLifecycle.Name)
+
+	assert.True(t, getLifecycle.Phases[0].IsPriorityPhase)
+}
+
 func createTestLifecycle_NewClient(t *testing.T, client *client.Client, lifecycleName string) *lifecycles.Lifecycle {
 	if client == nil {
 		client = getOctopusClient()