diff --git a/dotnet/src/Plugins/Plugins.Memory/Collections/MinHeap.cs b/dotnet/src/Plugins/Plugins.Memory/Collections/MinHeap.cs
index 5e368ded6ee8..3726c5b0a76e 100644
--- a/dotnet/src/Plugins/Plugins.Memory/Collections/MinHeap.cs
+++ b/dotnet/src/Plugins/Plugins.Memory/Collections/MinHeap.cs
@@ -11,7 +11,7 @@ namespace Microsoft.SemanticKernel.Plugins.Memory.Collections;
 /// Implements the classic 'heap' data structure. By default, the item with the lowest value is at the top of the heap.
 /// </summary>
 /// <typeparam name="T">Data type.</typeparam>
-public sealed class MinHeap<T> : IEnumerable<T> where T : IComparable<T>
+internal sealed class MinHeap<T> : IEnumerable<T> where T : IComparable<T>
 {
     private const int DefaultCapacity = 7;
     private const int MinCapacity = 0;
diff --git a/dotnet/src/Plugins/Plugins.Memory/Collections/ScoredValue.cs b/dotnet/src/Plugins/Plugins.Memory/Collections/ScoredValue.cs
index 9946965c800e..ebdb360b69f9 100644
--- a/dotnet/src/Plugins/Plugins.Memory/Collections/ScoredValue.cs
+++ b/dotnet/src/Plugins/Plugins.Memory/Collections/ScoredValue.cs
@@ -9,7 +9,7 @@ namespace Microsoft.SemanticKernel.Plugins.Memory.Collections;
 /// Structure for storing data which can be scored.
 /// </summary>
 /// <typeparam name="T">Data type.</typeparam>
-public readonly struct ScoredValue<T> : IComparable<ScoredValue<T>>, IEquatable<ScoredValue<T>>
+internal readonly struct ScoredValue<T> : IComparable<ScoredValue<T>>, IEquatable<ScoredValue<T>>
 {
     /// <summary>
     /// Initializes a new instance of the <see cref="ScoredValue{T}"/> struct.
diff --git a/dotnet/src/Plugins/Plugins.Memory/Collections/TopNCollection.cs b/dotnet/src/Plugins/Plugins.Memory/Collections/TopNCollection.cs
index 6369ef1ebb97..9a8b874cd2c8 100644
--- a/dotnet/src/Plugins/Plugins.Memory/Collections/TopNCollection.cs
+++ b/dotnet/src/Plugins/Plugins.Memory/Collections/TopNCollection.cs
@@ -10,7 +10,7 @@ namespace Microsoft.SemanticKernel.Plugins.Memory.Collections;
 /// Automatically flushes out any not in the top N.
 /// By default, items are not sorted by score until you call <see cref="TopNCollection{T}.SortByScore"/>.
 /// </summary>
-public class TopNCollection<T> : IEnumerable<ScoredValue<T>>
+internal sealed class TopNCollection<T> : IEnumerable<ScoredValue<T>>
 {
     private readonly MinHeap<ScoredValue<T>> _heap;
     private bool _sorted = false;
diff --git a/dotnet/src/Plugins/Plugins.UnitTests/Memory/Collections/MinHeapTests.cs b/dotnet/src/Plugins/Plugins.UnitTests/Memory/Collections/MinHeapTests.cs
deleted file mode 100644
index 7472b97cce83..000000000000
--- a/dotnet/src/Plugins/Plugins.UnitTests/Memory/Collections/MinHeapTests.cs
+++ /dev/null
@@ -1,149 +0,0 @@
-// Copyright (c) Microsoft. All rights reserved.
-
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using Microsoft.SemanticKernel.Plugins.Memory.Collections;
-using Xunit;
-
-namespace SemanticKernel.Plugins.UnitTests.Memory.Collections;
-
-/// <summary>
-/// Contains tests for the <see cref="MinHeap{T}"/> class.
-/// </summary>
-public class MinHeapTests
-{
-    private const int MinValue = 1;
-
-    [Fact]
-    public void ItThrowsExceptionWhenCapacityIsInvalid()
-    {
-        // Arrange
-        const int InvalidCapacity = -1;
-
-        void Action()
-        {
-            var minHeap = new MinHeap<int>(MinValue, InvalidCapacity);
-        }
-
-        // Act
-        var exception = Assert.Throws<ArgumentOutOfRangeException>("capacity", Action);
-
-        // Assert
-        Assert.Equal(-1, exception.ActualValue);
-    }
-
-    [Fact]
-    public void ItAddsItemsInCorrectOrder()
-    {
-        // Arrange
-        const int ExpectedTopItem = 1;
-        const int ExpectedCount = 3;
-
-        // Act
-        var minHeap = new MinHeap<int>(MinValue) { 3, 1, 2 };
-
-        // Assert
-        Assert.Equal(ExpectedTopItem, minHeap.Top);
-        Assert.Equal(ExpectedCount, minHeap.Count);
-    }
-
-    [Fact]
-    public void ItErasesItemsCorrectly()
-    {
-        // Arrange
-        const int ExpectedCount = 0;
-        var minHeap = new MinHeap<int>(MinValue) { 3, 1, 2 };
-
-        // Act
-        minHeap.Erase();
-
-        // Assert
-        Assert.Equal(ExpectedCount, minHeap.Count);
-    }
-
-    [Fact]
-    public void ItReturnsItemsOnBufferDetaching()
-    {
-        // Arrange
-        const int ExpectedHeapCount = 0;
-
-        var minHeap = new MinHeap<int>(MinValue) { 3, 1, 2 };
-
-        // Act
-        var items = minHeap.DetachBuffer();
-
-        // Assert
-        Assert.True(items.Length > 0);
-        Assert.Equal(ExpectedHeapCount, minHeap.Count);
-    }
-
-    [Fact]
-    public void ItThrowsExceptionOnAddingItemsAtInvalidIndex()
-    {
-        // Arrange
-        const int StartIndex = 4;
-
-        var items = new List<int> { 3, 1, 2 };
-        var minHeap = new MinHeap<int>(MinValue);
-
-        void action() { minHeap.Add(items, StartIndex); }
-
-        // Act
-        var exception = Assert.Throws<ArgumentOutOfRangeException>("startAt", () => action());
-
-        // Assert
-        Assert.Equal(StartIndex, exception.ActualValue);
-    }
-
-    [Fact]
-    public void ItRemovesTopItemCorrectly()
-    {
-        // Arrange
-        const int ExpectedTopItem = 2;
-        const int ExpectedHeapCount = 2;
-
-        var minHeap = new MinHeap<int>(MinValue) { 3, 1, 2 };
-
-        // Act
-        minHeap.RemoveTop();
-
-        // Assert
-        Assert.Equal(ExpectedTopItem, minHeap.Top);
-        Assert.Equal(ExpectedHeapCount, minHeap.Count);
-    }
-
-    [Fact]
-    public void ItRemovesAllItemsCorrectly()
-    {
-        // Arrange
-        const int ExpectedHeapCount = 0;
-
-        var minHeap = new MinHeap<int>(MinValue) { 3, 1, 2 };
-
-        // Act
-        var items = minHeap.RemoveAll().ToList();
-
-        // Assert
-        Assert.Equal(1, items[0]);
-        Assert.Equal(2, items[1]);
-        Assert.Equal(3, items[2]);
-
-        Assert.Equal(ExpectedHeapCount, minHeap.Count);
-    }
-
-    [Fact]
-    public void ItEnsuresCapacityToExpectedValue()
-    {
-        // Arrange
-        const int ExpectedCapacity = 16;
-
-        var minHeap = new MinHeap<int>(MinValue);
-
-        // Act
-        minHeap.EnsureCapacity(ExpectedCapacity);
-
-        // Assert
-        Assert.Equal(ExpectedCapacity, minHeap.Capacity);
-    }
-}
diff --git a/dotnet/src/Plugins/Plugins.UnitTests/Memory/Collections/TopNCollectionTests.cs b/dotnet/src/Plugins/Plugins.UnitTests/Memory/Collections/TopNCollectionTests.cs
deleted file mode 100644
index 507df5c972d3..000000000000
--- a/dotnet/src/Plugins/Plugins.UnitTests/Memory/Collections/TopNCollectionTests.cs
+++ /dev/null
@@ -1,73 +0,0 @@
-// Copyright (c) Microsoft. All rights reserved.
-
-using Microsoft.SemanticKernel.Plugins.Memory.Collections;
-using Xunit;
-
-namespace SemanticKernel.Plugins.UnitTests.Memory.Collections;
-
-/// <summary>
-/// Contains tests for the <see cref="TopNCollection{T}"/> class.
-/// </summary>
-public class TopNCollectionTests
-{
-    private const int MaxItemsCount = 5;
-
-    [Fact]
-    public void ItResetsCollectionCorrectly()
-    {
-        // Arrange
-        const int ExpectedItemsCount = 0;
-
-        var topNCollection = this.GetTestCollection(MaxItemsCount);
-
-        // Act
-        topNCollection.Reset();
-
-        // Assert
-        Assert.Equal(ExpectedItemsCount, topNCollection.Count);
-    }
-
-    [Fact]
-    public void ItKeepsMaxItemsCountWhenMoreItemsWereAdded()
-    {
-        // Arrange
-        const int ExpectedCollectionCount = 5;
-
-        // Act
-        var topNCollection = this.GetTestCollection(ExpectedCollectionCount);
-
-        // Assert
-        Assert.Equal(ExpectedCollectionCount, topNCollection.Count);
-    }
-
-    [Fact]
-    public void ItSortsCollectionByScoreInDescendingOrder()
-    {
-        // Arrange
-        var topNCollection = this.GetTestCollection(MaxItemsCount);
-
-        // Act
-        topNCollection.SortByScore();
-
-        // Assert
-        var items = topNCollection.ToList();
-
-        for (var i = 0; i < topNCollection.Count - 1; i++)
-        {
-            Assert.True(items[i].Score > items[i + 1].Score);
-        }
-    }
-
-    private TopNCollection<int> GetTestCollection(int maxItemsCount)
-    {
-        return new TopNCollection<int>(maxItemsCount)
-        {
-            new ScoredValue<int>(1, 0.5),
-            new ScoredValue<int>(2, 0.6),
-            new ScoredValue<int>(3, 0.4),
-            new ScoredValue<int>(4, 0.2),
-            new ScoredValue<int>(5, 0.9),
-            new ScoredValue<int>(6, 0.1),
-        };
-    }
-}