diff --git a/src/clients/Elsa.Api.Client/Extensions/ObjectConverter.cs b/src/clients/Elsa.Api.Client/Extensions/ObjectConverter.cs
index 8b302ab0b..75f7d9644 100644
--- a/src/clients/Elsa.Api.Client/Extensions/ObjectConverter.cs
+++ b/src/clients/Elsa.Api.Client/Extensions/ObjectConverter.cs
@@ -137,7 +137,7 @@ public static class ObjectConverter
                 return Enum.ToObject(underlyingTargetType, value);
 
             if (underlyingSourceType == typeof(double))
-                return Enum.ToObject(underlyingTargetType, Convert.ChangeType(value, typeof(int)));
+                return Enum.ToObject(underlyingTargetType, Convert.ChangeType(value, typeof(int), CultureInfo.InvariantCulture));
         }
 
         if (value is string s)
@@ -178,7 +178,7 @@ public static class ObjectConverter
 
         try
         {
-            return Convert.ChangeType(value, underlyingTargetType);
+            return Convert.ChangeType(value, underlyingTargetType, CultureInfo.InvariantCulture);
         }
         catch (InvalidCastException)
         {
diff --git a/src/clients/Elsa.Api.Client/IsExternalInit.cs b/src/clients/Elsa.Api.Client/IsExternalInit.cs
index c3a98e575..653e3c181 100644
--- a/src/clients/Elsa.Api.Client/IsExternalInit.cs
+++ b/src/clients/Elsa.Api.Client/IsExternalInit.cs
@@ -4,4 +4,4 @@ using System.ComponentModel;
 namespace System.Runtime.CompilerServices;
 
 [EditorBrowsable(EditorBrowsableState.Never)]
-internal class IsExternalInit{}
\ No newline at end of file
+internal sealed class IsExternalInit;
\ No newline at end of file
diff --git a/src/clients/Elsa.Api.Client/Resources/ActivityDescriptorOptions/Requests/GetActivityDescriptorOptionsRequest.cs b/src/clients/Elsa.Api.Client/Resources/ActivityDescriptorOptions/Requests/GetActivityDescriptorOptionsRequest.cs
index 6d1725249..7897cef6f 100644
--- a/src/clients/Elsa.Api.Client/Resources/ActivityDescriptorOptions/Requests/GetActivityDescriptorOptionsRequest.cs
+++ b/src/clients/Elsa.Api.Client/Resources/ActivityDescriptorOptions/Requests/GetActivityDescriptorOptionsRequest.cs
@@ -8,5 +8,5 @@ public class GetActivityDescriptorOptionsRequest
     /// <summary>
     /// Object context use to pass custom information
     /// </summary>
-    public object? Context { get; set; } = default;
+    public object? Context { get; set; }
 }
\ No newline at end of file
diff --git a/src/clients/Elsa.Api.Client/Resources/WorkflowDefinitions/Models/WorkflowDefinition.cs b/src/clients/Elsa.Api.Client/Resources/WorkflowDefinitions/Models/WorkflowDefinition.cs
index f3fe5d0eb..4a6ddb194 100644
--- a/src/clients/Elsa.Api.Client/Resources/WorkflowDefinitions/Models/WorkflowDefinition.cs
+++ b/src/clients/Elsa.Api.Client/Resources/WorkflowDefinitions/Models/WorkflowDefinition.cs
@@ -81,5 +81,5 @@ public class WorkflowDefinition : LinkedEntity
     /// <summary>
     /// An option to use the workflow as a readonly workflow.
     /// </summary>
-    public bool IsReadonly { get; set; } = false;
+    public bool IsReadonly { get; set; }
 }
\ No newline at end of file
diff --git a/src/clients/Elsa.Api.Client/Resources/WorkflowInstances/Models/Bookmark.cs b/src/clients/Elsa.Api.Client/Resources/WorkflowInstances/Models/Bookmark.cs
index f4a48d1bf..40f7f62dd 100644
--- a/src/clients/Elsa.Api.Client/Resources/WorkflowInstances/Models/Bookmark.cs
+++ b/src/clients/Elsa.Api.Client/Resources/WorkflowInstances/Models/Bookmark.cs
@@ -12,8 +12,9 @@ namespace Elsa.Api.Client.Resources.WorkflowInstances.Models;
 /// <param name="Payload">The data associated with the bookmark.</param>
 /// <param name="ActivityNodeId">The ID of the activity node associated with the bookmark.</param>
 /// <param name="ActivityInstanceId">The ID of the activity instance associated with the bookmark.</param>
-/// <param name="AutoBurn">Whether or not the bookmark should be automatically burned.</param>
+/// <param name="AutoBurn">Whether the bookmark should be automatically burned.</param>
 /// <param name="CallbackMethodName">The name of the method on the activity class to invoke when the bookmark is resumed.</param>
+/// <param name="Metadata">The metadata associated with this bookmark.</param>
 [PublicAPI]
 public record Bookmark(
     string Id,
diff --git a/src/clients/Elsa.Api.Client/Resources/WorkflowInstances/Responses/BulkDeleteWorkflowInstancesResponse.cs b/src/clients/Elsa.Api.Client/Resources/WorkflowInstances/Responses/BulkDeleteWorkflowInstancesResponse.cs
index 73aa8280c..b72920995 100644
--- a/src/clients/Elsa.Api.Client/Resources/WorkflowInstances/Responses/BulkDeleteWorkflowInstancesResponse.cs
+++ b/src/clients/Elsa.Api.Client/Resources/WorkflowInstances/Responses/BulkDeleteWorkflowInstancesResponse.cs
@@ -2,7 +2,7 @@ using System.Text.Json.Serialization;
 
 namespace Elsa.Api.Client.Resources.WorkflowInstances.Responses;
 
-internal class BulkDeleteWorkflowInstancesResponse
+internal sealed class BulkDeleteWorkflowInstancesResponse
 {
     [JsonPropertyName("deleted")] public int DeletedCount { get; }
 }
\ No newline at end of file
diff --git a/src/clients/Elsa.Api.Client/Shared/Models/ActivityNode.cs b/src/clients/Elsa.Api.Client/Shared/Models/ActivityNode.cs
index c04cd79c4..752595141 100644
--- a/src/clients/Elsa.Api.Client/Shared/Models/ActivityNode.cs
+++ b/src/clients/Elsa.Api.Client/Shared/Models/ActivityNode.cs
@@ -37,7 +37,7 @@ public class ActivityNode
         get
         {
             var ancestorIds = Ancestors().Reverse().Select(x => x.Activity.GetId()).ToList();
-            return ancestorIds.Any() ? $"{string.Join(":", ancestorIds)}:{Activity.GetId()}" : Activity.GetId();
+            return ancestorIds.Count > 0 ? $"{string.Join(":", ancestorIds)}:{Activity.GetId()}" : Activity.GetId();
         }
     }
 
diff --git a/src/clients/Elsa.Api.Client/Shared/Models/LinkedEntity.cs b/src/clients/Elsa.Api.Client/Shared/Models/LinkedEntity.cs
index 306ddd26a..2d5047e5a 100644
--- a/src/clients/Elsa.Api.Client/Shared/Models/LinkedEntity.cs
+++ b/src/clients/Elsa.Api.Client/Shared/Models/LinkedEntity.cs
@@ -8,5 +8,5 @@ public class LinkedEntity : VersionedEntity
     /// <summary>
     /// A list of links that with the possible actions used in the context of HATEOAS.
     /// </summary>
-    public Link[]? Links { get; set; } = default;
+    public Link[]? Links { get; set; }
 }
diff --git a/src/clients/Elsa.Api.Client/Shared/Models/PagedListResponse.cs b/src/clients/Elsa.Api.Client/Shared/Models/PagedListResponse.cs
index 14866e631..beb9415f0 100644
--- a/src/clients/Elsa.Api.Client/Shared/Models/PagedListResponse.cs
+++ b/src/clients/Elsa.Api.Client/Shared/Models/PagedListResponse.cs
@@ -3,11 +3,9 @@ namespace Elsa.Api.Client.Shared.Models;
 /// <summary>
 /// Represents a generic paged list response that offers a unified format for returning paged list of things from API endpoints.
 /// </summary>
-/// <param name="Items">A page of items.</param>
-/// <param name="TotalCount">The total number of items.</param>
 /// <typeparam name="T">The type of the items.</typeparam>
 public class PagedListResponse<T> : LinkedEntity
 {
-    public ICollection<T> Items { get; set; }
+    public ICollection<T> Items { get; set; } = default!;
     public long TotalCount { get; set; }
 }
\ No newline at end of file
diff --git a/src/clients/Elsa.Api.Client/Shared/Models/VersionOptions.cs b/src/clients/Elsa.Api.Client/Shared/Models/VersionOptions.cs
index 1a76ee1e4..ab36220bc 100644
--- a/src/clients/Elsa.Api.Client/Shared/Models/VersionOptions.cs
+++ b/src/clients/Elsa.Api.Client/Shared/Models/VersionOptions.cs
@@ -1,4 +1,5 @@
 using System.ComponentModel;
+using System.Globalization;
 using System.Text.Json.Serialization;
 using Elsa.Api.Client.Converters;
 using JetBrains.Annotations;
@@ -60,7 +61,7 @@ public struct VersionOptions
             "Published" => Published,
             "LatestOrPublished" => LatestOrPublished,
             "LatestAndPublished" => LatestAndPublished,
-            _ => SpecificVersion(int.Parse(value))
+            _ => SpecificVersion(int.Parse(value, CultureInfo.InvariantCulture))
         };
 
     /// <summary>
@@ -113,5 +114,5 @@ public struct VersionOptions
     /// <summary>
     /// Returns a simple string representation of this <see cref="VersionOptions"/>.
     /// </summary>
-    public override string ToString() => AllVersions ? "AllVersions" : IsDraft ? "Draft" : IsLatest ? "Latest" : IsPublished ? "Published" : IsLatestOrPublished ? "LatestOrPublished" : IsLatestAndPublished ? "LatestAndPublished" : Version.ToString();
+    public override string ToString() => AllVersions ? "AllVersions" : IsDraft ? "Draft" : IsLatest ? "Latest" : IsPublished ? "Published" : IsLatestOrPublished ? "LatestOrPublished" : IsLatestAndPublished ? "LatestAndPublished" : Version.ToString(CultureInfo.InvariantCulture);
 }
diff --git a/src/clients/Elsa.Api.Client/Shared/UIHints/CheckList/CheckListItem.cs b/src/clients/Elsa.Api.Client/Shared/UIHints/CheckList/CheckListItem.cs
index 05c90b968..53cd50bd6 100644
--- a/src/clients/Elsa.Api.Client/Shared/UIHints/CheckList/CheckListItem.cs
+++ b/src/clients/Elsa.Api.Client/Shared/UIHints/CheckList/CheckListItem.cs
@@ -2,7 +2,9 @@ namespace Elsa.Api.Client.Shared.UIHints.CheckList;
 
 public class CheckListItem
 {
+#pragma warning disable CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
     public string Text { get; set; }
     public string Value { get; set; }
+#pragma warning restore CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
     public bool IsChecked { get; set; }
 }
\ No newline at end of file
diff --git a/src/common/Elsa.DropIns/Catalogs/DirectoryDropInCatalog.cs b/src/common/Elsa.DropIns/Catalogs/DirectoryDropInCatalog.cs
index 6b1b4de87..8a05e2460 100644
--- a/src/common/Elsa.DropIns/Catalogs/DirectoryDropInCatalog.cs
+++ b/src/common/Elsa.DropIns/Catalogs/DirectoryDropInCatalog.cs
@@ -50,12 +50,12 @@ public class DirectoryDropInCatalog : IDropInCatalog
         }
     }
 
-    private IEnumerable<string> ListPackages()
+    private string[] ListPackages()
     {
         return Directory.GetFiles(_directoryPath, "*.nupkg", SearchOption.AllDirectories);
     }
 
-    private Assembly? LoadDropInAssembly(string path)
+    private static Assembly? LoadDropInAssembly(string path)
     {
         return !File.Exists(path) ? null : AssemblyLoader.LoadPath(path);
     }
diff --git a/src/common/Elsa.DropIns/Contexts/DirectoryAssemblyLoadContext.cs b/src/common/Elsa.DropIns/Contexts/DirectoryAssemblyLoadContext.cs
index 45bd6bd99..4a33f99db 100644
--- a/src/common/Elsa.DropIns/Contexts/DirectoryAssemblyLoadContext.cs
+++ b/src/common/Elsa.DropIns/Contexts/DirectoryAssemblyLoadContext.cs
@@ -3,7 +3,7 @@ using System.Runtime.Loader;
 
 namespace Elsa.DropIns.Contexts;
 
-internal class DirectoryAssemblyLoadContext : AssemblyLoadContext
+internal sealed class DirectoryAssemblyLoadContext : AssemblyLoadContext
 {
     private readonly AssemblyDependencyResolver _resolver;
 
diff --git a/src/common/Elsa.DropIns/Contexts/NuGetPackageAssemblyLoadContext.cs b/src/common/Elsa.DropIns/Contexts/NuGetPackageAssemblyLoadContext.cs
index f0fd3e59b..febba4f8a 100644
--- a/src/common/Elsa.DropIns/Contexts/NuGetPackageAssemblyLoadContext.cs
+++ b/src/common/Elsa.DropIns/Contexts/NuGetPackageAssemblyLoadContext.cs
@@ -4,7 +4,7 @@ using NuGet.Packaging;
 
 namespace Elsa.DropIns.Contexts;
 
-internal class NuGetPackageAssemblyLoadContext : AssemblyLoadContext
+internal sealed class NuGetPackageAssemblyLoadContext : AssemblyLoadContext
 {
     private readonly Dictionary<string, Assembly> _loadedAssemblies = new Dictionary<string, Assembly>();
 
@@ -12,7 +12,7 @@ internal class NuGetPackageAssemblyLoadContext : AssemblyLoadContext
     {
         var packageReader = new PackageArchiveReader(nugetPackagePath);
 
-        foreach (var dllFile in packageReader.GetFiles().Where(fileName => fileName.EndsWith(".dll")))
+        foreach (var dllFile in packageReader.GetFiles().Where(fileName => fileName.EndsWith(".dll", StringComparison.OrdinalIgnoreCase)))
         {
             using var dllStream = packageReader.GetStream(dllFile);
             using var memoryStream = new MemoryStream();
@@ -26,6 +26,6 @@ internal class NuGetPackageAssemblyLoadContext : AssemblyLoadContext
 
     protected override Assembly? Load(AssemblyName assemblyName)
     {
-        return _loadedAssemblies.TryGetValue(assemblyName.FullName, out var assembly) ? assembly : null;
+        return _loadedAssemblies.GetValueOrDefault(assemblyName.FullName);
     }
 }
\ No newline at end of file
diff --git a/src/common/Elsa.Features/Attributes/DependsOn.cs b/src/common/Elsa.Features/Attributes/DependsOn.cs
index 6a38ec575..fb9e3fa0a 100644
--- a/src/common/Elsa.Features/Attributes/DependsOn.cs
+++ b/src/common/Elsa.Features/Attributes/DependsOn.cs
@@ -4,13 +4,13 @@ namespace Elsa.Features.Attributes;
 /// Specifies that the feature depends on another feature.
 /// </summary>
 [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
-public class DependsOn : Attribute
+public class DependsOnAttribute : Attribute
 {
     /// <summary>
-    /// Initializes a new instance of the <see cref="DependsOn"/> class.
+    /// Initializes a new instance of the <see cref="DependsOnAttribute"/> class.
     /// </summary>
     /// <param name="type">The type of the feature this feature depends on.</param>
-    public DependsOn(Type type)
+    public DependsOnAttribute(Type type)
     {
         Type = type;
     }
diff --git a/src/common/Elsa.Features/Extensions/EnumerableTopologicalSortExtensions.cs b/src/common/Elsa.Features/Extensions/EnumerableTopologicalSortExtensions.cs
index bf1a1ca84..3be72b1d8 100644
--- a/src/common/Elsa.Features/Extensions/EnumerableTopologicalSortExtensions.cs
+++ b/src/common/Elsa.Features/Extensions/EnumerableTopologicalSortExtensions.cs
@@ -23,10 +23,8 @@ public static class EnumerableTopologicalSortExtensions
 
     private static void Visit<T>(T item, ISet<T> visited, ICollection<T> sorted, Func<T, IEnumerable<T>> dependencies, bool throwOnCycle)
     {
-        if (!visited.Contains(item))
+        if (visited.Add(item))
         {
-            visited.Add(item);
-
             foreach (var dep in dependencies(item))
                 Visit(dep, visited, sorted, dependencies, throwOnCycle);
 
diff --git a/src/common/Elsa.Features/Implementations/Module.cs b/src/common/Elsa.Features/Implementations/Module.cs
index 1728843cc..66e16e4d1 100644
--- a/src/common/Elsa.Features/Implementations/Module.cs
+++ b/src/common/Elsa.Features/Implementations/Module.cs
@@ -14,11 +14,11 @@ namespace Elsa.Features.Implementations;
 /// <inheritdoc />
 public class Module : IModule
 {
-    private record HostedServiceDescriptor(int Order, Type Type);
+    private sealed record HostedServiceDescriptor(int Order, Type Type);
 
-    private IDictionary<Type, IFeature> _features = new Dictionary<Type, IFeature>();
-    private readonly ISet<IFeature> _configuredFeatures = new HashSet<IFeature>();
-    private readonly ICollection<HostedServiceDescriptor> _hostedServiceDescriptors = new List<HostedServiceDescriptor>();
+    private Dictionary<Type, IFeature> _features = new();
+    private readonly HashSet<IFeature> _configuredFeatures = new();
+    private readonly List<HostedServiceDescriptor> _hostedServiceDescriptors = new();
 
     /// <summary>
     /// Constructor.
@@ -134,7 +134,7 @@ public class Module : IModule
             let featureType = feature.GetType()
             let dependencyOfAttributes = featureType.GetCustomAttributes<DependencyOfAttribute>().ToList()
             let missingDependencies = dependencyOfAttributes.Where(x => !_features.ContainsKey(x.Type)).ToList()
-            where !missingDependencies.Any()
+            where missingDependencies.Count == 0
             select feature;
     }
 
@@ -154,17 +154,17 @@ public class Module : IModule
         return _features.TryGetValue(featureType, out var existingFeature) ? existingFeature : (IFeature)Activator.CreateInstance(featureType, this)!;
     }
 
-    private ISet<Type> GetFeatureTypes()
+    private HashSet<Type> GetFeatureTypes()
     {
         var featureTypes = _features.Keys.ToHashSet();
         var featureTypesWithDependencies = featureTypes.Concat(featureTypes.SelectMany(GetDependencyTypes)).ToHashSet();
-        return featureTypesWithDependencies.TSort(x => x.GetCustomAttributes<DependsOn>().Select(dependsOn => dependsOn.Type)).ToHashSet();
+        return featureTypesWithDependencies.TSort(x => x.GetCustomAttributes<DependsOnAttribute>().Select(dependsOn => dependsOn.Type)).ToHashSet();
     }
 
     // Recursively get dependency types.
     private IEnumerable<Type> GetDependencyTypes(Type type)
     {
-        var dependencies = type.GetCustomAttributes<DependsOn>().Select(dependsOn => dependsOn.Type).ToList();
+        var dependencies = type.GetCustomAttributes<DependsOnAttribute>().Select(dependsOn => dependsOn.Type).ToList();
         return dependencies.Concat(dependencies.SelectMany(GetDependencyTypes));
     }
 }
\ No newline at end of file
diff --git a/src/common/Elsa.Features/Services/InstalledFeatureRegistry.cs b/src/common/Elsa.Features/Services/InstalledFeatureRegistry.cs
index 205a790da..abd2e6d7c 100644
--- a/src/common/Elsa.Features/Services/InstalledFeatureRegistry.cs
+++ b/src/common/Elsa.Features/Services/InstalledFeatureRegistry.cs
@@ -6,7 +6,7 @@ namespace Elsa.Features.Services;
 /// <inheritdoc />
 public class InstalledFeatureRegistry : IInstalledFeatureRegistry
 {
-    private readonly IDictionary<string, FeatureDescriptor> _descriptors = new Dictionary<string, FeatureDescriptor>();
+    private readonly Dictionary<string, FeatureDescriptor> _descriptors = new();
 
     /// <inheritdoc />
     public void Add(FeatureDescriptor descriptor) => _descriptors[descriptor.FullName] = descriptor;
@@ -15,5 +15,5 @@ public class InstalledFeatureRegistry : IInstalledFeatureRegistry
     public IEnumerable<FeatureDescriptor> List() => _descriptors.Values;
 
     /// <inheritdoc />
-    public FeatureDescriptor? Find(string fullName) => _descriptors.TryGetValue(fullName, out var descriptor) ? descriptor : null;
+    public FeatureDescriptor? Find(string fullName) => _descriptors.GetValueOrDefault(fullName);
 }
\ No newline at end of file
diff --git a/src/common/Elsa.Mediator/Contracts/ICommandSender.cs b/src/common/Elsa.Mediator/Contracts/ICommandSender.cs
index d6dde4dba..fb7a44b34 100644
--- a/src/common/Elsa.Mediator/Contracts/ICommandSender.cs
+++ b/src/common/Elsa.Mediator/Contracts/ICommandSender.cs
@@ -37,5 +37,5 @@ public interface ICommandSender
     /// <param name="command">The command to send.</param>
     /// <param name="strategy">The command strategy to use.</param>
     /// <param name="cancellationToken">The cancellation token.</param>
-    Task SendAsync(ICommand command, ICommandStrategy strategy, CancellationToken cancellationToken = default);
+    Task SendAsync(ICommand command, ICommandStrategy? strategy, CancellationToken cancellationToken = default);
 }
\ No newline at end of file
diff --git a/src/common/Elsa.Mediator/Contracts/INotificationSender.cs b/src/common/Elsa.Mediator/Contracts/INotificationSender.cs
index 980c6b6dc..75c2fbaae 100644
--- a/src/common/Elsa.Mediator/Contracts/INotificationSender.cs
+++ b/src/common/Elsa.Mediator/Contracts/INotificationSender.cs
@@ -18,7 +18,7 @@ public interface INotificationSender
     /// Publishes the given notification.
     /// </summary>
     /// <param name="notification">The notification to publish.</param>
-    /// <param name="strategy"><see cref="FireAndForgetStrategy"/><see cref="SequentialProcessingStrategy"/><see cref="ParallelProcessingStrategy"/></param>
+    /// <param name="strategy"><see cref="SequentialProcessingStrategy"/><see cref="ParallelProcessingStrategy"/></param>
     /// <param name="cancellationToken">The cancellation token.</param>
-    Task SendAsync(INotification notification, IEventPublishingStrategy strategy, CancellationToken cancellationToken = default);
+    Task SendAsync(INotification notification, IEventPublishingStrategy? strategy, CancellationToken cancellationToken = default);
 }
\ No newline at end of file
diff --git a/src/common/Elsa.Mediator/HostedServices/BackgroundCommandSenderHostedService.cs b/src/common/Elsa.Mediator/HostedServices/BackgroundCommandSenderHostedService.cs
index b661c13d7..6b5092dbc 100644
--- a/src/common/Elsa.Mediator/HostedServices/BackgroundCommandSenderHostedService.cs
+++ b/src/common/Elsa.Mediator/HostedServices/BackgroundCommandSenderHostedService.cs
@@ -14,7 +14,7 @@ public class BackgroundCommandSenderHostedService : BackgroundService
     private readonly int _workerCount;
     private readonly ICommandsChannel _commandsChannel;
     private readonly IServiceScopeFactory _scopeFactory;
-    private readonly IList<Channel<ICommand>> _outputs;
+    private readonly List<Channel<ICommand>> _outputs;
     private readonly ILogger _logger;
 
     /// <inheritdoc />
diff --git a/src/common/Elsa.Mediator/HostedServices/BackgroundEventPublisherHostedService.cs b/src/common/Elsa.Mediator/HostedServices/BackgroundEventPublisherHostedService.cs
index b467581f9..19d6e686d 100644
--- a/src/common/Elsa.Mediator/HostedServices/BackgroundEventPublisherHostedService.cs
+++ b/src/common/Elsa.Mediator/HostedServices/BackgroundEventPublisherHostedService.cs
@@ -14,7 +14,7 @@ public class BackgroundEventPublisherHostedService : BackgroundService
     private readonly int _workerCount;
     private readonly INotificationsChannel _notificationsChannel;
     private readonly IServiceScopeFactory _scopeFactory;
-    private readonly IList<Channel<INotification>> _outputs;
+    private readonly List<Channel<INotification>> _outputs;
     private readonly ILogger _logger;
 
     /// <inheritdoc />
diff --git a/src/common/Elsa.Mediator/HostedServices/MessageProcessorHostedService.cs b/src/common/Elsa.Mediator/HostedServices/MessageProcessorHostedService.cs
index a7858c94d..9f99961ec 100644
--- a/src/common/Elsa.Mediator/HostedServices/MessageProcessorHostedService.cs
+++ b/src/common/Elsa.Mediator/HostedServices/MessageProcessorHostedService.cs
@@ -14,7 +14,7 @@ public class MessageProcessorHostedService<T> : BackgroundService where T : notn
     private readonly Channel<T> _channel;
     private readonly IEnumerable<IConsumer<T>> _consumers;
     private readonly ILogger _logger;
-    private readonly IList<MessageWorker<T>> _workers;
+    private readonly List<MessageWorker<T>> _workers;
 
     /// <inheritdoc />
     // ReSharper disable once ContextualLoggerProblem
diff --git a/src/common/Elsa.Mediator/Middleware/Command/CommandPipelineBuilder.cs b/src/common/Elsa.Mediator/Middleware/Command/CommandPipelineBuilder.cs
index b5added8e..8b98d49a3 100644
--- a/src/common/Elsa.Mediator/Middleware/Command/CommandPipelineBuilder.cs
+++ b/src/common/Elsa.Mediator/Middleware/Command/CommandPipelineBuilder.cs
@@ -6,7 +6,7 @@ namespace Elsa.Mediator.Middleware.Command;
 public class CommandPipelineBuilder : ICommandPipelineBuilder
 {
     private const string ServicesKey = "mediator.Services";
-    private readonly IList<Func<CommandMiddlewareDelegate, CommandMiddlewareDelegate>> _components = new List<Func<CommandMiddlewareDelegate, CommandMiddlewareDelegate>>();
+    private readonly List<Func<CommandMiddlewareDelegate, CommandMiddlewareDelegate>> _components = new();
 
     /// <summary>
     /// Initializes a new instance of the <see cref="CommandPipelineBuilder"/> class.
@@ -38,8 +38,10 @@ public class CommandPipelineBuilder : ICommandPipelineBuilder
     {
         CommandMiddlewareDelegate pipeline = _ => new ValueTask();
 
-        foreach (var component in _components.Reverse())
-            pipeline = component(pipeline);
+        for (int i = _components.Count - 1; i >= 0; i--)
+        {
+            pipeline = _components[i](pipeline);
+        }
 
         return pipeline;
     }
diff --git a/src/common/Elsa.Mediator/Middleware/Command/Components/CommandHandlerInvokerMiddleware.cs b/src/common/Elsa.Mediator/Middleware/Command/Components/CommandHandlerInvokerMiddleware.cs
index d9ea80593..7ad8487eb 100644
--- a/src/common/Elsa.Mediator/Middleware/Command/Components/CommandHandlerInvokerMiddleware.cs
+++ b/src/common/Elsa.Mediator/Middleware/Command/Components/CommandHandlerInvokerMiddleware.cs
@@ -33,7 +33,7 @@ public class CommandHandlerInvokerMiddleware : ICommandMiddleware
         var handlerType = typeof(ICommandHandler<,>).MakeGenericType(commandType, resultType);
         var handlers = _commandHandlers.Where(x => handlerType.IsInstanceOfType(x)).ToArray();
 
-        if (!handlers.Any())
+        if (handlers.Length == 0)
             throw new InvalidOperationException($"There is no handler to handle the {commandType.FullName} command");
 
         if (handlers.Length > 1)
diff --git a/src/common/Elsa.Mediator/Middleware/Notification/NotificationPipelineBuilder.cs b/src/common/Elsa.Mediator/Middleware/Notification/NotificationPipelineBuilder.cs
index cfa803c01..850229f3b 100644
--- a/src/common/Elsa.Mediator/Middleware/Notification/NotificationPipelineBuilder.cs
+++ b/src/common/Elsa.Mediator/Middleware/Notification/NotificationPipelineBuilder.cs
@@ -6,7 +6,7 @@ namespace Elsa.Mediator.Middleware.Notification;
 public class NotificationPipelineBuilder : INotificationPipelineBuilder
 {
     private const string ServicesKey = "mediator.Services";
-    private readonly IList<Func<NotificationMiddlewareDelegate, NotificationMiddlewareDelegate>> _components = new List<Func<NotificationMiddlewareDelegate, NotificationMiddlewareDelegate>>();
+    private readonly List<Func<NotificationMiddlewareDelegate, NotificationMiddlewareDelegate>> _components = new();
 
     /// <summary>
     /// Initializes a new instance of the <see cref="NotificationPipelineBuilder"/> class.
@@ -38,8 +38,10 @@ public class NotificationPipelineBuilder : INotificationPipelineBuilder
     {
         NotificationMiddlewareDelegate pipeline = _ => new ValueTask();
 
-        foreach (var component in _components.Reverse())
-            pipeline = component(pipeline);
+        for (int i = _components.Count - 1; i >= 0; i--)
+        {
+            pipeline = _components[i](pipeline);
+        }
 
         return pipeline;
     }
diff --git a/src/common/Elsa.Mediator/Middleware/Request/RequestPipelineBuilder.cs b/src/common/Elsa.Mediator/Middleware/Request/RequestPipelineBuilder.cs
index 5d210c6bd..173203b91 100644
--- a/src/common/Elsa.Mediator/Middleware/Request/RequestPipelineBuilder.cs
+++ b/src/common/Elsa.Mediator/Middleware/Request/RequestPipelineBuilder.cs
@@ -6,7 +6,7 @@ namespace Elsa.Mediator.Middleware.Request;
 public class RequestPipelineBuilder : IRequestPipelineBuilder
 {
     private const string ServicesKey = "mediator.Services";
-    private readonly IList<Func<RequestMiddlewareDelegate, RequestMiddlewareDelegate>> _components = new List<Func<RequestMiddlewareDelegate, RequestMiddlewareDelegate>>();
+    private readonly List<Func<RequestMiddlewareDelegate, RequestMiddlewareDelegate>> _components = new();
 
     /// <summary>
     /// Initializes a new instance of the <see cref="RequestPipelineBuilder"/> class.
@@ -38,8 +38,10 @@ public class RequestPipelineBuilder : IRequestPipelineBuilder
     {
         RequestMiddlewareDelegate pipeline = _ => new ValueTask();
 
-        foreach (var component in _components.Reverse())
-            pipeline = component(pipeline);
+        for (int i = _components.Count - 1; i >= 0; i--)
+        {
+            pipeline = _components[i](pipeline);
+        }
 
         return pipeline;
     }
diff --git a/src/modules/Elsa.Common/Contexts/TenantResolutionContext.cs b/src/modules/Elsa.Common/Contexts/TenantResolutionContext.cs
index 8dc9ec2c3..e0b544d9c 100644
--- a/src/modules/Elsa.Common/Contexts/TenantResolutionContext.cs
+++ b/src/modules/Elsa.Common/Contexts/TenantResolutionContext.cs
@@ -25,7 +25,7 @@ public class TenantResolutionContext
     /// <summary>
     /// Gets the cancellation token.
     /// </summary>
-    public CancellationToken CancellationToken { get; } = default;
+    public CancellationToken CancellationToken { get; }
 
     /// <summary>
     /// Finds a tenant based on the provided tenant ID.
diff --git a/src/modules/Elsa.Common/Converters/DecimalJsonConverter.cs b/src/modules/Elsa.Common/Converters/DecimalJsonConverter.cs
index 95b172545..b4c41e55e 100644
--- a/src/modules/Elsa.Common/Converters/DecimalJsonConverter.cs
+++ b/src/modules/Elsa.Common/Converters/DecimalJsonConverter.cs
@@ -1,3 +1,4 @@
+using System.Globalization;
 using System.Text.Json;
 using System.Text.Json.Serialization;
 
@@ -17,7 +18,7 @@ public class DecimalJsonConverter : JsonConverter<decimal>
         if (reader.TokenType == JsonTokenType.String)
         {
             var value = reader.GetString()!;
-            return decimal.Parse(value);
+            return decimal.Parse(value, CultureInfo.InvariantCulture);
         }
 
         throw new JsonException("Expected number or string.");
diff --git a/src/modules/Elsa.Common/Converters/IntegerJsonConverter.cs b/src/modules/Elsa.Common/Converters/IntegerJsonConverter.cs
index 8c2bbf5b7..142aadeec 100644
--- a/src/modules/Elsa.Common/Converters/IntegerJsonConverter.cs
+++ b/src/modules/Elsa.Common/Converters/IntegerJsonConverter.cs
@@ -1,3 +1,4 @@
+using System.Globalization;
 using System.Text.Json;
 using System.Text.Json.Serialization;
 
@@ -17,7 +18,7 @@ public class IntegerJsonConverter : JsonConverter<int>
         if (reader.TokenType == JsonTokenType.String)
         {
             var value = reader.GetString()!;
-            return int.Parse(value);
+            return int.Parse(value, CultureInfo.InvariantCulture);
         }
 
         throw new JsonException("Expected number or string.");
diff --git a/src/modules/Elsa.Common/Models/VersionOptions.cs b/src/modules/Elsa.Common/Models/VersionOptions.cs
index f3c56f598..e854587d2 100644
--- a/src/modules/Elsa.Common/Models/VersionOptions.cs
+++ b/src/modules/Elsa.Common/Models/VersionOptions.cs
@@ -1,4 +1,5 @@
 using System.ComponentModel;
+using System.Globalization;
 using System.Text.Json.Serialization;
 using Elsa.Common.Converters;
 using JetBrains.Annotations;
@@ -60,7 +61,7 @@ public struct VersionOptions
             "Published" => Published,
             "LatestOrPublished" => LatestOrPublished,
             "LatestAndPublished" => LatestAndPublished,
-            _ => SpecificVersion(int.Parse(value))
+            _ => SpecificVersion(int.Parse(value, CultureInfo.InvariantCulture))
         };
 
     /// <summary>
@@ -113,5 +114,5 @@ public struct VersionOptions
     /// <summary>
     /// Returns a simple string representation of this <see cref="VersionOptions"/>.
     /// </summary>
-    public override string ToString() => AllVersions ? "AllVersions" : IsDraft ? "Draft" : IsLatest ? "Latest" : IsPublished ? "Published" : IsLatestOrPublished ? "LatestOrPublished" : IsLatestAndPublished ? "LatestAndPublished" : Version.ToString();
+    public override string ToString() => AllVersions ? "AllVersions" : IsDraft ? "Draft" : IsLatest ? "Latest" : IsPublished ? "Published" : IsLatestOrPublished ? "LatestOrPublished" : IsLatestAndPublished ? "LatestAndPublished" : Version.ToString(CultureInfo.InvariantCulture);
 }
diff --git a/src/modules/Elsa.Common/Serialization/ConfigurableSerializer.cs b/src/modules/Elsa.Common/Serialization/ConfigurableSerializer.cs
index a017e645b..60ce4a00a 100644
--- a/src/modules/Elsa.Common/Serialization/ConfigurableSerializer.cs
+++ b/src/modules/Elsa.Common/Serialization/ConfigurableSerializer.cs
@@ -67,7 +67,7 @@ public abstract class ConfigurableSerializer
     /// <summary>
     /// Creates a new instance of <see cref="JsonSerializerOptions"/>.
     /// </summary>
-    private JsonSerializerOptions CreateOptionsInternal()
+    private static JsonSerializerOptions CreateOptionsInternal()
     {
         var options = new JsonSerializerOptions
         {
diff --git a/src/modules/Elsa.Common/Services/MemoryStore.cs b/src/modules/Elsa.Common/Services/MemoryStore.cs
index ab0d71ac4..d08fc8603 100644
--- a/src/modules/Elsa.Common/Services/MemoryStore.cs
+++ b/src/modules/Elsa.Common/Services/MemoryStore.cs
@@ -119,7 +119,7 @@ public class MemoryStore<TEntity>
         foreach (var entry in entries)
             Entities.Remove(entry);
 
-        return entries.LongCount();
+        return entries.Count;
     }
 
     /// <summary>
diff --git a/src/modules/Elsa.Expressions/Helpers/ObjectConverter.cs b/src/modules/Elsa.Expressions/Helpers/ObjectConverter.cs
index 571397bee..142b9de09 100644
--- a/src/modules/Elsa.Expressions/Helpers/ObjectConverter.cs
+++ b/src/modules/Elsa.Expressions/Helpers/ObjectConverter.cs
@@ -181,10 +181,10 @@ public static class ObjectConverter
                 return Enum.ToObject(underlyingTargetType, value);
 
             if (underlyingSourceType == typeof(double))
-                return Enum.ToObject(underlyingTargetType, Convert.ChangeType(value, typeof(int)));
+                return Enum.ToObject(underlyingTargetType, Convert.ChangeType(value, typeof(int), CultureInfo.InvariantCulture));
             
             if (underlyingSourceType == typeof(long))
-                return Enum.ToObject(underlyingTargetType, Convert.ChangeType(value, typeof(int)));
+                return Enum.ToObject(underlyingTargetType, Convert.ChangeType(value, typeof(int), CultureInfo.InvariantCulture));
         }
 
         if (value is string s)
@@ -225,7 +225,7 @@ public static class ObjectConverter
 
         try
         {
-            return Convert.ChangeType(value, underlyingTargetType);
+            return Convert.ChangeType(value, underlyingTargetType, CultureInfo.InvariantCulture);
         }
         catch (InvalidCastException e)
         {
diff --git a/src/modules/Elsa.Expressions/Services/WellKnownTypeRegistry.cs b/src/modules/Elsa.Expressions/Services/WellKnownTypeRegistry.cs
index 8a973d3b1..3ca1f622c 100644
--- a/src/modules/Elsa.Expressions/Services/WellKnownTypeRegistry.cs
+++ b/src/modules/Elsa.Expressions/Services/WellKnownTypeRegistry.cs
@@ -7,8 +7,8 @@ namespace Elsa.Expressions.Services;
 /// <inheritdoc />
 public class WellKnownTypeRegistry : IWellKnownTypeRegistry
 {
-    private readonly IDictionary<string, Type> _aliasTypeDictionary = new Dictionary<string, Type>();
-    private readonly IDictionary<Type, string> _typeAliasDictionary = new Dictionary<Type, string>();
+    private readonly Dictionary<string, Type> _aliasTypeDictionary = new();
+    private readonly Dictionary<Type, string> _typeAliasDictionary = new();
 
     /// <summary>
     /// Creates a new instance of the <see cref="WellKnownTypeRegistry"/> class.
diff --git a/test/unit/Elsa.MongoDb.UnitTests/Elsa.MongoDb.UnitTests.csproj b/test/unit/Elsa.MongoDb.UnitTests/Elsa.MongoDb.UnitTests.csproj
index e3e605c9f..d511196d0 100644
--- a/test/unit/Elsa.MongoDb.UnitTests/Elsa.MongoDb.UnitTests.csproj
+++ b/test/unit/Elsa.MongoDb.UnitTests/Elsa.MongoDb.UnitTests.csproj
@@ -4,11 +4,6 @@
         <TargetFramework>net8.0</TargetFramework>
     </PropertyGroup>
 
-    <ItemGroup>
-        <PackageReference Include="NSubstitute"/>
-    </ItemGroup>
-
-
     <ItemGroup>
       <ProjectReference Include="..\..\..\src\modules\Elsa.MongoDb\Elsa.MongoDb.csproj" />
     </ItemGroup>
diff --git a/test/unit/Elsa.Workflows.Runtime.UnitTests/Elsa.Workflows.Runtime.UnitTests.csproj b/test/unit/Elsa.Workflows.Runtime.UnitTests/Elsa.Workflows.Runtime.UnitTests.csproj
index 4a25fd633..243a3ddde 100644
--- a/test/unit/Elsa.Workflows.Runtime.UnitTests/Elsa.Workflows.Runtime.UnitTests.csproj
+++ b/test/unit/Elsa.Workflows.Runtime.UnitTests/Elsa.Workflows.Runtime.UnitTests.csproj
@@ -8,8 +8,4 @@
       <ProjectReference Include="..\..\..\src\modules\Elsa.Workflows.Runtime\Elsa.Workflows.Runtime.csproj" />
     </ItemGroup>
 
-    <ItemGroup>
-      <PackageReference Include="NSubstitute" />
-    </ItemGroup>
-    
 </Project>