diff --git a/CHANGELOG.md b/CHANGELOG.md
index b104e8f13..b10e43b72 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -84,6 +84,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Add disabled text color and `(D)` and `(H)` labels for disabled and hidden channels in channel list
 - Graphics engine: fix subtitle path escaping and font loading
 - Fix corrupt output (green artifacts) when decoding certain 10-bit content using AMD Polaris GPUs
+- Work around sequential schedule validation limit (1000/hr by Newtonsoft.Json.Schema library)
+  - Playout builds now use JsonSchema.Net library which has no validation limit
+  - Validation tool in the UI still uses Newtonsoft.Json.Schema (with 1000/hr limit) as the error output is easier to understand
 
 ### Changed
 - Classic schedules: `Refresh` classic playouts from playout list; do not `Reset` them
diff --git a/ErsatzTV.Infrastructure/ErsatzTV.Infrastructure.csproj b/ErsatzTV.Infrastructure/ErsatzTV.Infrastructure.csproj
index a4749fe99..209bf6f44 100644
--- a/ErsatzTV.Infrastructure/ErsatzTV.Infrastructure.csproj
+++ b/ErsatzTV.Infrastructure/ErsatzTV.Infrastructure.csproj
@@ -16,6 +16,7 @@
         <PackageReference Include="EFCore.BulkExtensions" Version="9.0.2" />
         <PackageReference Include="Elastic.Clients.Elasticsearch" Version="9.2.1" />
         <PackageReference Include="Jint" Version="4.4.2" />
+        <PackageReference Include="JsonSchema.Net" Version="7.4.0" />
         <PackageReference Include="Lucene.Net" Version="4.8.0-beta00017" />
         <PackageReference Include="Lucene.Net.Analysis.Common" Version="4.8.0-beta00017" />
         <PackageReference Include="Lucene.Net.QueryParser" Version="4.8.0-beta00017" />
diff --git a/ErsatzTV.Infrastructure/Scheduling/SequentialScheduleValidator.cs b/ErsatzTV.Infrastructure/Scheduling/SequentialScheduleValidator.cs
index 3062aec4e..ea994c858 100644
--- a/ErsatzTV.Infrastructure/Scheduling/SequentialScheduleValidator.cs
+++ b/ErsatzTV.Infrastructure/Scheduling/SequentialScheduleValidator.cs
@@ -1,6 +1,7 @@
 using System.Globalization;
 using System.IO.Abstractions;
 using System.Text.Json;
+using System.Text.Json.Nodes;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Interfaces.Scheduling;
 using Microsoft.Extensions.Logging;
@@ -9,6 +10,7 @@ using Newtonsoft.Json.Linq;
 using Newtonsoft.Json.Schema;
 using YamlDotNet.RepresentationModel;
 using JsonSerializer = System.Text.Json.JsonSerializer;
+using JsonSchemaNet = Json.Schema;
 
 namespace ErsatzTV.Infrastructure.Scheduling;
 
@@ -19,21 +21,19 @@ public class SequentialScheduleValidator(IFileSystem fileSystem, ILogger<Sequent
     {
         try
         {
-            string schemaFileName = Path.Combine(
-                FileSystemLayout.ResourcesCacheFolder,
-                isImport ? "sequential-schedule-import.schema.json" : "sequential-schedule.schema.json");
-            using StreamReader sr = fileSystem.File.OpenText(schemaFileName);
-            await using var reader = new JsonTextReader(sr);
-            var schema = JSchema.Load(reader);
+            string schemaFileName = GetSchemaPath(isImport);
+            string schemaText = await fileSystem.File.ReadAllTextAsync(schemaFileName);
+
+            JsonSchemaNet.JsonSchema schema = JsonSchemaNet.JsonSchema.FromText(schemaText);
+
+            string jsonString = ConvertYamlToJsonString(yaml);
+            JsonNode jsonNode = JsonNode.Parse(jsonString);
 
-            using var textReader = new StringReader(yaml);
-            var yamlStream = new YamlStream();
-            yamlStream.Load(textReader);
-            var schedule = JObject.Parse(Convert(yamlStream));
+            JsonSchemaNet.EvaluationResults result = schema.Evaluate(jsonNode);
 
-            if (!schedule.IsValid(schema, out IList<string> errorMessages))
+            if (!result.IsValid)
             {
-                logger.LogWarning("Failed to validate sequential schedule definition: {ErrorMessages}", errorMessages);
+                logger.LogWarning("Sequential schedule definition failed validation");
                 return false;
             }
 
@@ -49,30 +49,27 @@ public class SequentialScheduleValidator(IFileSystem fileSystem, ILogger<Sequent
 
     public string ToJson(string yaml)
     {
-        using var textReader = new StringReader(yaml);
-        var yamlStream = new YamlStream();
-        yamlStream.Load(textReader);
-        var schedule = JObject.Parse(Convert(yamlStream));
+        string jsonString = ConvertYamlToJsonString(yaml);
+        var schedule = JObject.Parse(jsonString);
+
         string formatted = JsonConvert.SerializeObject(schedule, Formatting.Indented);
         string[] lines = formatted.Split('\n');
         return string.Join('\n', lines.Select((line, index) => $"{index + 1,4}: {line}"));
     }
 
+    // limited to 1000/hr, but only called manually from UI
     public async Task<IList<string>> GetValidationMessages(string yaml, bool isImport)
     {
         try
         {
-            string schemaFileName = Path.Combine(
-                FileSystemLayout.ResourcesCacheFolder,
-                isImport ? "sequential-schedule-import.schema.json" : "sequential-schedule.schema.json");
+            string schemaFileName = GetSchemaPath(isImport);
+
             using StreamReader sr = fileSystem.File.OpenText(schemaFileName);
             await using var reader = new JsonTextReader(sr);
             var schema = JSchema.Load(reader);
 
-            using var textReader = new StringReader(yaml);
-            var yamlStream = new YamlStream();
-            yamlStream.Load(textReader);
-            var schedule = JObject.Parse(Convert(yamlStream));
+            string jsonString = ConvertYamlToJsonString(yaml);
+            var schedule = JObject.Parse(jsonString);
 
             return schedule.IsValid(schema, out IList<string> errorMessages) ? [] : errorMessages;
         }
@@ -82,13 +79,24 @@ public class SequentialScheduleValidator(IFileSystem fileSystem, ILogger<Sequent
         }
     }
 
-    private static string Convert(YamlStream yamlStream)
+    private static string ConvertYamlToJsonString(string yaml)
     {
+        using var textReader = new StringReader(yaml);
+        var yamlStream = new YamlStream();
+        yamlStream.Load(textReader);
+
         var visitor = new YamlToJsonVisitor();
         yamlStream.Accept(visitor);
         return JsonConvert.SerializeObject(JsonConvert.DeserializeObject(visitor.JsonString), Formatting.Indented);
     }
 
+    private static string GetSchemaPath(bool isImport)
+    {
+        return Path.Combine(
+            FileSystemLayout.ResourcesCacheFolder,
+            isImport ? "sequential-schedule-import.schema.json" : "sequential-schedule.schema.json");
+    }
+
     private sealed class YamlToJsonVisitor : IYamlVisitor
     {
         private readonly JsonSerializerOptions _options = new() { WriteIndented = false };