diff --git a/osu.Framework.Tests/Containers/ContainerEnumerableTest.cs b/osu.Framework.Tests/Containers/ContainerEnumerableTest.cs
index 13c5e5ce3..7eac338b8 100644
--- a/osu.Framework.Tests/Containers/ContainerEnumerableTest.cs
+++ b/osu.Framework.Tests/Containers/ContainerEnumerableTest.cs
@@ -46,7 +46,7 @@ namespace osu.Framework.Tests.Containers
             {
                 var unused = new AudioContainer
                 {
-                    Children = (IReadOnlyList<Drawable>)Activator.CreateInstance(containerType)
+                    Children = (IReadOnlyList<Drawable>)Activator.CreateInstance(containerType)!
                 };
             });
 
@@ -54,7 +54,7 @@ namespace osu.Framework.Tests.Containers
             {
                 var unused = new AudioContainer();
 
-                unused.AddRange((IEnumerable<Drawable>)Activator.CreateInstance(containerType));
+                unused.AddRange((IEnumerable<Drawable>)Activator.CreateInstance(containerType)!);
             });
         }
     }
diff --git a/osu.Framework.Tests/Visual/Graphics/TestSceneStencil.cs b/osu.Framework.Tests/Visual/Graphics/TestSceneStencil.cs
index cb2dfcdff..7d7dc20cf 100644
--- a/osu.Framework.Tests/Visual/Graphics/TestSceneStencil.cs
+++ b/osu.Framework.Tests/Visual/Graphics/TestSceneStencil.cs
@@ -2,6 +2,7 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System.Collections.Generic;
+using System.Diagnostics;
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
@@ -94,6 +95,8 @@ namespace osu.Framework.Tests.Visual.Graphics
                 // No depth testing.
                 renderer.PushDepthInfo(new DepthInfo(false));
 
+                Debug.Assert(Children != null);
+
                 drawStencil(renderer, Children[1]);
                 drawBackground(renderer, Children[0]);
 
@@ -141,7 +144,7 @@ namespace osu.Framework.Tests.Visual.Graphics
                 renderer.PopStencilInfo();
             }
 
-            public List<DrawNode> Children { get; set; } = new List<DrawNode>();
+            public List<DrawNode>? Children { get; set; } = new List<DrawNode>();
 
             public bool AddChildDrawNodes => true;
         }
diff --git a/osu.Framework/Graphics/ICompositeDrawNode.cs b/osu.Framework/Graphics/ICompositeDrawNode.cs
index 2987f468a..b61364850 100644
--- a/osu.Framework/Graphics/ICompositeDrawNode.cs
+++ b/osu.Framework/Graphics/ICompositeDrawNode.cs
@@ -15,7 +15,7 @@ namespace osu.Framework.Graphics
         /// <summary>
         /// The child <see cref="DrawNode"/>s to draw.
         /// </summary>
-        List<DrawNode> Children { get; set; }
+        List<DrawNode>? Children { get; set; }
 
         /// <summary>
         /// Whether <see cref="Children"/> should be updated by the parenting <see cref="CompositeDrawable"/>.
diff --git a/osu.Framework/Graphics/IDrawable.cs b/osu.Framework/Graphics/IDrawable.cs
index 040308dd6..92fafe525 100644
--- a/osu.Framework/Graphics/IDrawable.cs
+++ b/osu.Framework/Graphics/IDrawable.cs
@@ -42,7 +42,7 @@ namespace osu.Framework.Graphics
         /// <summary>
         /// The parent of this drawable in the scene graph.
         /// </summary>
-        CompositeDrawable Parent { get; }
+        CompositeDrawable? Parent { get; }
 
         /// <summary>
         /// Whether this drawable is present for any sort of user-interaction.