diff --git a/src/NATS.Client.JetStream/Models/AccountStats.cs b/src/NATS.Client.JetStream/Models/AccountStats.cs
index cdb1ff39c..ebe93c644 100644
--- a/src/NATS.Client.JetStream/Models/AccountStats.cs
+++ b/src/NATS.Client.JetStream/Models/AccountStats.cs
@@ -48,7 +48,7 @@ public record AccountStats
 
     [System.Text.Json.Serialization.JsonPropertyName("tiers")]
     [System.Text.Json.Serialization.JsonIgnore(Condition = System.Text.Json.Serialization.JsonIgnoreCondition.WhenWritingDefault)]
-    public IDictionary<string, object>? Tiers { get; set; }
+    public IDictionary<string, Tier>? Tiers { get; set; }
 
     [System.Text.Json.Serialization.JsonPropertyName("api")]
     [System.Text.Json.Serialization.JsonIgnore(Condition = System.Text.Json.Serialization.JsonIgnoreCondition.Never)]
diff --git a/src/NATS.Client.JetStream/Models/ApiStats.cs b/src/NATS.Client.JetStream/Models/ApiStats.cs
index e555e67b9..abd4b31a7 100644
--- a/src/NATS.Client.JetStream/Models/ApiStats.cs
+++ b/src/NATS.Client.JetStream/Models/ApiStats.cs
@@ -25,4 +25,12 @@ public record ApiStats
     [System.Text.Json.Serialization.JsonIgnore(Condition = System.Text.Json.Serialization.JsonIgnoreCondition.Never)]
     [System.ComponentModel.DataAnnotations.Range(0, int.MaxValue)]
     public int Errors { get; set; }
+
+    /// <summary>
+    /// Inflight API requests
+    /// </summary>
+    [System.Text.Json.Serialization.JsonPropertyName("inflight")]
+    [System.Text.Json.Serialization.JsonIgnore(Condition = System.Text.Json.Serialization.JsonIgnoreCondition.WhenWritingDefault)]
+    [System.ComponentModel.DataAnnotations.Range(0, ulong.MaxValue)]
+    public ulong Inflight { get; set; }
 }
diff --git a/src/NATS.Client.JetStream/Models/Tier.cs b/src/NATS.Client.JetStream/Models/Tier.cs
index 2a2207c5a..be2a9bc68 100644
--- a/src/NATS.Client.JetStream/Models/Tier.cs
+++ b/src/NATS.Client.JetStream/Models/Tier.cs
@@ -18,6 +18,22 @@ public record Tier
     [System.ComponentModel.DataAnnotations.Range(0, int.MaxValue)]
     public int Storage { get; set; }
 
+    /// <summary>
+    /// Reserved Memory for Stream Message storage
+    /// </summary>
+    [System.Text.Json.Serialization.JsonPropertyName("reserved_memory")]
+    [System.Text.Json.Serialization.JsonIgnore(Condition = System.Text.Json.Serialization.JsonIgnoreCondition.Never)]
+    [System.ComponentModel.DataAnnotations.Range(0, ulong.MaxValue)]
+    public ulong ReservedMemory { get; set; }
+
+    /// <summary>
+    /// Reserved Memory for Stream Message storage
+    /// </summary>
+    [System.Text.Json.Serialization.JsonPropertyName("reserved_storage")]
+    [System.Text.Json.Serialization.JsonIgnore(Condition = System.Text.Json.Serialization.JsonIgnoreCondition.Never)]
+    [System.ComponentModel.DataAnnotations.Range(0, ulong.MaxValue)]
+    public ulong ReservedStore { get; set; }
+
     /// <summary>
     /// Number of active Streams
     /// </summary>