diff --git a/RhSolutions.AddIn/Controllers/RibbonController.cs b/RhSolutions.AddIn/Controllers/RibbonController.cs
index 0e82060..efc0d15 100644
--- a/RhSolutions.AddIn/Controllers/RibbonController.cs
+++ b/RhSolutions.AddIn/Controllers/RibbonController.cs
@@ -63,7 +63,7 @@ public class RibbonController : ExcelRibbon
     {
         try
         {
-            ToolBase tool = control.Id switch
+            using ToolBase tool = control.Id switch
             {
                 "export" => new ExportTool(),
                 "convert" => new ConvertTool(),
diff --git a/RhSolutions.AddIn/Services/IExcelReader.cs b/RhSolutions.AddIn/Services/IExcelReader.cs
index a134e4c..897d452 100644
--- a/RhSolutions.AddIn/Services/IExcelReader.cs
+++ b/RhSolutions.AddIn/Services/IExcelReader.cs
@@ -1,8 +1,9 @@
 namespace RhSolutions.Services;
 
-public interface IExcelReader
+public interface IExcelReader : IDisposable
 {
     public Dictionary<Product, double> ReadProducts(Range range);
     public List<(string, Dictionary<Product, double>)> ReadProducts(IEnumerable<Worksheet> worksheets);
     public List<(string, Dictionary<Product, double>)> ReadProducts(string[] files);
+    new void Dispose();
 } 
diff --git a/RhSolutions.AddIn/Services/IExcelWriter.cs b/RhSolutions.AddIn/Services/IExcelWriter.cs
index 5d2ea29..ea6bf5a 100644
--- a/RhSolutions.AddIn/Services/IExcelWriter.cs
+++ b/RhSolutions.AddIn/Services/IExcelWriter.cs
@@ -1,7 +1,8 @@
 namespace RhSolutions.Services;
 
-public interface IExcelWriter
+public interface IExcelWriter : IDisposable
 {
     public void WriteProducts(IEnumerable<(string, Dictionary<Product, double>)> products);
     public void WriteProducts(Dictionary<Product, double> products);
+    new void Dispose();
 }
diff --git a/RhSolutions.AddIn/Tools/ToolBase.cs b/RhSolutions.AddIn/Tools/ToolBase.cs
index 9c37bc3..518cefe 100644
--- a/RhSolutions.AddIn/Tools/ToolBase.cs
+++ b/RhSolutions.AddIn/Tools/ToolBase.cs
@@ -7,7 +7,7 @@ namespace RhSolutions.Tools;
 #if !NET472
 [SupportedOSPlatform("windows")]
 #endif
-internal abstract class ToolBase
+internal abstract class ToolBase : IDisposable
 {
     protected readonly IExcelReader _reader;
     protected readonly IExcelWriter _writer;
@@ -18,5 +18,11 @@ internal abstract class ToolBase
         _writer = RhSolutionsAddIn.ServiceProvider.GetRequiredService<IExcelWriter>();
     }
 
+    public void Dispose()
+    {
+        _reader.Dispose();
+        _writer.Dispose();
+    }
+
     public abstract void Execute();
 }
\ No newline at end of file