diff --git a/Source/GenerateSharp/Opal/Utilities/Path.cs b/Source/GenerateSharp/Opal/Utilities/Path.cs
index a36640d1..0b267323 100644
--- a/Source/GenerateSharp/Opal/Utilities/Path.cs
+++ b/Source/GenerateSharp/Opal/Utilities/Path.cs
@@ -573,7 +573,7 @@ private static void DecomposeRawPathString(
 	/// Convert the components of the path into the string value.
 	/// </summary>
 	private void SetState(
-		IList<string> directories,
+		List<string> directories,
 		string? root,
 		string? fileName)
 	{
diff --git a/Source/GenerateSharp/PackageManager.Core/ClosureManager.cs b/Source/GenerateSharp/PackageManager.Core/ClosureManager.cs
index a6e2bb56..50e03c95 100644
--- a/Source/GenerateSharp/PackageManager.Core/ClosureManager.cs
+++ b/Source/GenerateSharp/PackageManager.Core/ClosureManager.cs
@@ -244,7 +244,7 @@ private async Task<PackageLock> EnsurePackageLockAsync(
 		IDictionary<string, IDictionary<string, IDictionary<PackageName, PackageReference>>> BuildClosures,
 		IDictionary<string, IDictionary<string, IDictionary<PackageName, PackageReference>>> ToolClosures)> GenerateServiceClosureAsync(
 		int rootPackageId,
-		IDictionary<int, (string Language, string? Owner, string Name, Path Path)> localPackageReverseLookup,
+		Dictionary<int, (string Language, string? Owner, string Name, Path Path)> localPackageReverseLookup,
 		IDictionary<Path, Api.Client.PackageLocalReferenceModel> localPackageLookup,
 		IList<Api.Client.PackagePublicReferenceModel> publicPackages)
 	{
diff --git a/Source/GenerateSharp/Utilities/OperationGraph/OperationGraphManager.cs b/Source/GenerateSharp/Utilities/OperationGraph/OperationGraphManager.cs
index 81389127..d24f6ec7 100644
--- a/Source/GenerateSharp/Utilities/OperationGraph/OperationGraphManager.cs
+++ b/Source/GenerateSharp/Utilities/OperationGraph/OperationGraphManager.cs
@@ -110,7 +110,7 @@ public static void SaveState(
 		OperationGraphWriter.Serialize(state, writer);
 	}
 
-	private static void UpdateFileIds(IList<FileId> fileIds, IDictionary<FileId, FileId> activeFileIdMap)
+	private static void UpdateFileIds(IList<FileId> fileIds, Dictionary<FileId, FileId> activeFileIdMap)
 	{
 		for (var i = 0; i < fileIds.Count; i++)
 		{
diff --git a/Source/GenerateSharp/Utilities/OperationGraph/OperationResultsManager.cs b/Source/GenerateSharp/Utilities/OperationGraph/OperationResultsManager.cs
index d3a3041f..4458c311 100644
--- a/Source/GenerateSharp/Utilities/OperationGraph/OperationResultsManager.cs
+++ b/Source/GenerateSharp/Utilities/OperationGraph/OperationResultsManager.cs
@@ -110,7 +110,7 @@ public static void SaveState(
 		OperationGraphWriter.Serialize(state, writer);
 	}
 
-	private static void UpdateFileIds(IList<FileId> fileIds, IDictionary<FileId, FileId> activeFileIdMap)
+	private static void UpdateFileIds(IList<FileId> fileIds, Dictionary<FileId, FileId> activeFileIdMap)
 	{
 		for (var i = 0; i < fileIds.Count; i++)
 		{