diff --git a/src/Seq.Api/Model/AppInstances/AppInstanceEntity.cs b/src/Seq.Api/Model/AppInstances/AppInstanceEntity.cs
index 5297189..e563308 100644
--- a/src/Seq.Api/Model/AppInstances/AppInstanceEntity.cs
+++ b/src/Seq.Api/Model/AppInstances/AppInstanceEntity.cs
@@ -61,7 +61,7 @@ public AppInstanceEntity()
         /// <summary>
         /// Values for the settings exposed by the app.
         /// </summary>
-        public Dictionary<string, string> Settings { get; set; }
+        public Dictionary<string, string>? Settings { get; set; }
 
         /// <summary>
         /// If <c>true</c>, administrative users may invoke the app manually or through alerts.
@@ -79,13 +79,13 @@ public AppInstanceEntity()
         /// The settings that can be overridden at invocation time (when an event is sent to
         /// the instance).
         /// </summary>
-        public List<string> InvocationOverridableSettings { get; set; }
+        public List<string>? InvocationOverridableSettings { get; set; }
 
         /// <summary>
         /// Metadata describing the overridable settings. This field is provided by the server
         /// and cannot be modified.
         /// </summary>
-        public List<AppSettingPart> InvocationOverridableSettingDefinitions { get; set; }
+        public List<AppSettingPart>? InvocationOverridableSettingDefinitions { get; set; }
 
         /// <summary>
         /// If <c>true</c>, events will be streamed to the app. Otherwise, events will be
@@ -123,31 +123,31 @@ public AppInstanceEntity()
         /// Settings that control how events are ingested through the app.
         /// </summary>
         [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore)]
-        public InputSettingsPart InputSettings { get; set; }
+        public InputSettingsPart? InputSettings { get; set; }
 
         /// <summary>
         /// Metrics describing the state and activity of the app process.
         /// </summary>
         [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore)]
-        public AppInstanceProcessMetricsPart ProcessMetrics { get; set; }
+        public AppInstanceProcessMetricsPart? ProcessMetrics { get; set; }
         
         /// <summary>
         /// Information about ingestion activity through this app.
         /// </summary>
         [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore)]
-        public InputMetricsPart InputMetrics { get; set; }
+        public InputMetricsPart? InputMetrics { get; set; }
 
         /// <summary>
         /// Information about the app's diagnostic input.
         /// </summary>
         [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore)]
-        public InputMetricsPart DiagnosticInputMetrics { get; set; }
+        public InputMetricsPart? DiagnosticInputMetrics { get; set; }
 
         /// <summary>
         /// Information about events output through the app.
         /// </summary>
         [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore)]
-        public AppInstanceOutputMetricsPart OutputMetrics { get; set; }
+        public AppInstanceOutputMetricsPart? OutputMetrics { get; set; }
         
         /// <summary>
         /// Obsolete.