diff --git a/src/Stripe.net/Services/Invoices/InvoiceSubscriptionDetailsCancelAt.cs b/src/Stripe.net/Services/Invoices/InvoiceSubscriptionDetailsCancelAt.cs
new file mode 100644
index 0000000000..1a839ec195
--- /dev/null
+++ b/src/Stripe.net/Services/Invoices/InvoiceSubscriptionDetailsCancelAt.cs
@@ -0,0 +1,14 @@
+// File generated from our OpenAPI spec
+namespace Stripe
+{
+    public class InvoiceSubscriptionDetailsCancelAt : StringEnum
+    {
+        public static readonly InvoiceSubscriptionDetailsCancelAt MaxPeriodEnd = new InvoiceSubscriptionDetailsCancelAt("max_period_end");
+        public static readonly InvoiceSubscriptionDetailsCancelAt MinPeriodEnd = new InvoiceSubscriptionDetailsCancelAt("min_period_end");
+
+        private InvoiceSubscriptionDetailsCancelAt(string value)
+            : base(value)
+        {
+        }
+    }
+}
diff --git a/src/Stripe.net/Services/Invoices/InvoiceSubscriptionDetailsOptions.cs b/src/Stripe.net/Services/Invoices/InvoiceSubscriptionDetailsOptions.cs
index aece062843..b06f7e965f 100644
--- a/src/Stripe.net/Services/Invoices/InvoiceSubscriptionDetailsOptions.cs
+++ b/src/Stripe.net/Services/Invoices/InvoiceSubscriptionDetailsOptions.cs
@@ -42,12 +42,12 @@ public class InvoiceSubscriptionDetailsOptions : INestedOptions
         /// proration for that period.
         /// </summary>
         [JsonProperty("cancel_at")]
-        [JsonConverter(typeof(UnixDateTimeConverter))]
+        [JsonConverter(typeof(AnyOfConverter))]
 #if NET6_0_OR_GREATER
         [STJS.JsonPropertyName("cancel_at")]
-        [STJS.JsonConverter(typeof(STJUnixDateTimeConverter))]
+        [STJS.JsonConverter(typeof(STJAnyOfConverter))]
 #endif
-        public DateTime? CancelAt { get; set; }
+        public AnyOf<DateTime?, InvoiceSubscriptionDetailsCancelAt> CancelAt { get; set; }
 
         /// <summary>
         /// Indicate whether this subscription should cancel at the end of the current period
diff --git a/src/Stripe.net/Services/Subscriptions/SubscriptionCancelAt.cs b/src/Stripe.net/Services/Subscriptions/SubscriptionCancelAt.cs
new file mode 100644
index 0000000000..059afeb172
--- /dev/null
+++ b/src/Stripe.net/Services/Subscriptions/SubscriptionCancelAt.cs
@@ -0,0 +1,14 @@
+// File generated from our OpenAPI spec
+namespace Stripe
+{
+    public class SubscriptionCancelAt : StringEnum
+    {
+        public static readonly SubscriptionCancelAt MaxPeriodEnd = new SubscriptionCancelAt("max_period_end");
+        public static readonly SubscriptionCancelAt MinPeriodEnd = new SubscriptionCancelAt("min_period_end");
+
+        private SubscriptionCancelAt(string value)
+            : base(value)
+        {
+        }
+    }
+}
diff --git a/src/Stripe.net/Services/Subscriptions/SubscriptionCreateOptions.cs b/src/Stripe.net/Services/Subscriptions/SubscriptionCreateOptions.cs
index 4f8514952a..fccfb1a5a1 100644
--- a/src/Stripe.net/Services/Subscriptions/SubscriptionCreateOptions.cs
+++ b/src/Stripe.net/Services/Subscriptions/SubscriptionCreateOptions.cs
@@ -110,12 +110,12 @@ public class SubscriptionCreateOptions : BaseOptions, IHasMetadata
         /// proration for that period.
         /// </summary>
         [JsonProperty("cancel_at")]
-        [JsonConverter(typeof(UnixDateTimeConverter))]
+        [JsonConverter(typeof(AnyOfConverter))]
 #if NET6_0_OR_GREATER
         [STJS.JsonPropertyName("cancel_at")]
-        [STJS.JsonConverter(typeof(STJUnixDateTimeConverter))]
+        [STJS.JsonConverter(typeof(STJAnyOfConverter))]
 #endif
-        public DateTime? CancelAt { get; set; }
+        public AnyOf<DateTime?, SubscriptionCancelAt> CancelAt { get; set; }
 
         /// <summary>
         /// Indicate whether this subscription should cancel at the end of the current period
diff --git a/src/Stripe.net/Services/Subscriptions/SubscriptionUpdateOptions.cs b/src/Stripe.net/Services/Subscriptions/SubscriptionUpdateOptions.cs
index 16027aa8f9..ee8a87b5c0 100644
--- a/src/Stripe.net/Services/Subscriptions/SubscriptionUpdateOptions.cs
+++ b/src/Stripe.net/Services/Subscriptions/SubscriptionUpdateOptions.cs
@@ -76,12 +76,12 @@ public class SubscriptionUpdateOptions : BaseOptions, IHasMetadata
         /// proration for that period.
         /// </summary>
         [JsonProperty("cancel_at")]
-        [JsonConverter(typeof(UnixDateTimeConverter))]
+        [JsonConverter(typeof(AnyOfConverter))]
 #if NET6_0_OR_GREATER
         [STJS.JsonPropertyName("cancel_at")]
-        [STJS.JsonConverter(typeof(STJUnixDateTimeConverter))]
+        [STJS.JsonConverter(typeof(STJAnyOfConverter))]
 #endif
-        public DateTime? CancelAt { get; set; }
+        public AnyOf<DateTime?, SubscriptionCancelAt> CancelAt { get; set; }
 
         /// <summary>
         /// Indicate whether this subscription should cancel at the end of the current period