diff --git a/src/Umbraco.Core/Deploy/IDeployContext.cs b/src/Umbraco.Core/Deploy/IDeployContext.cs
index c2a3a39d1e..c6e2da997b 100644
--- a/src/Umbraco.Core/Deploy/IDeployContext.cs
+++ b/src/Umbraco.Core/Deploy/IDeployContext.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 
 namespace Umbraco.Cms.Core.Deploy
@@ -37,7 +37,7 @@ namespace Umbraco.Cms.Core.Deploy
         /// <typeparam name="T">The type of the item.</typeparam>
         /// <param name="key">The key of the item.</param>
         /// <returns>The item with the specified key and type, if any, else null.</returns>
-        T Item<T>(string key) where T : class;
+        T? Item<T>(string key) where T : class;
 
         ///// <summary>
         ///// Gets the global deployment cancellation token.
diff --git a/src/Umbraco.Core/Deploy/IImageSourceParser.cs b/src/Umbraco.Core/Deploy/IImageSourceParser.cs
index a15b45f40b..084ba1b118 100644
--- a/src/Umbraco.Core/Deploy/IImageSourceParser.cs
+++ b/src/Umbraco.Core/Deploy/IImageSourceParser.cs
@@ -1,5 +1,3 @@
-using System.Collections.Generic;
-
 namespace Umbraco.Cms.Core.Deploy
 {
     /// <summary>
@@ -14,7 +12,7 @@ namespace Umbraco.Cms.Core.Deploy
         /// <param name="dependencies">A list of dependencies.</param>
         /// <returns>The parsed value.</returns>
         /// <remarks>Turns src="/media/..." into src="umb://media/..." and adds the corresponding udi to the dependencies.</remarks>
-        string ToArtifact(string value, ICollection<Udi> dependencies);
+        string? ToArtifact(string? value, ICollection<Udi> dependencies);
 
         /// <summary>
         /// Parses an artifact property value and produces an Umbraco property value.
@@ -22,6 +20,6 @@ namespace Umbraco.Cms.Core.Deploy
         /// <param name="value">The artifact property value.</param>
         /// <returns>The parsed value.</returns>
         /// <remarks>Turns umb://media/... into /media/....</remarks>
-        string FromArtifact(string value);
+        string? FromArtifact(string? value);
     }
 }
diff --git a/src/Umbraco.Core/Deploy/IMacroParser.cs b/src/Umbraco.Core/Deploy/IMacroParser.cs
index 622a4abc1b..81b014c1cc 100644
--- a/src/Umbraco.Core/Deploy/IMacroParser.cs
+++ b/src/Umbraco.Core/Deploy/IMacroParser.cs
@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 
 namespace Umbraco.Cms.Core.Deploy
 {
@@ -10,14 +10,14 @@ namespace Umbraco.Cms.Core.Deploy
         /// <param name="value">Property value.</param>
         /// <param name="dependencies">A list of dependencies.</param>
         /// <returns>Parsed value.</returns>
-        string ToArtifact(string value, ICollection<Udi> dependencies);
+        string? ToArtifact(string? value, ICollection<Udi> dependencies);
 
         /// <summary>
         /// Parses an artifact property value and produces an Umbraco property value.
         /// </summary>
         /// <param name="value">Artifact property value.</param>
         /// <returns>Parsed value.</returns>
-        string FromArtifact(string value);
+        string? FromArtifact(string? value);
 
         /// <summary>
         /// Tries to replace the value of the attribute/parameter with a value containing a converted identifier.
diff --git a/src/Umbraco.Core/Deploy/IServiceConnector.cs b/src/Umbraco.Core/Deploy/IServiceConnector.cs
index b28989f5de..dfc4f3d28e 100644
--- a/src/Umbraco.Core/Deploy/IServiceConnector.cs
+++ b/src/Umbraco.Core/Deploy/IServiceConnector.cs
@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using Umbraco.Cms.Core.Composing;
 
 namespace Umbraco.Cms.Core.Deploy
@@ -13,7 +13,7 @@ namespace Umbraco.Cms.Core.Deploy
         /// </summary>
         /// <param name="udi">The entity identifier of the artifact.</param>
         /// <returns>The corresponding artifact, or null.</returns>
-        IArtifact GetArtifact(Udi udi);
+        IArtifact? GetArtifact(Udi udi);
 
         /// <summary>
         /// Gets an artifact.
diff --git a/src/Umbraco.Core/Deploy/IValueConnector.cs b/src/Umbraco.Core/Deploy/IValueConnector.cs
index b7ba2e4096..32a536a870 100644
--- a/src/Umbraco.Core/Deploy/IValueConnector.cs
+++ b/src/Umbraco.Core/Deploy/IValueConnector.cs
@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using Umbraco.Cms.Core.Models;
 
 namespace Umbraco.Cms.Core.Deploy
@@ -23,7 +23,7 @@ namespace Umbraco.Cms.Core.Deploy
         /// <param name="propertyType">The value property type</param>
         /// <param name="dependencies">The content dependencies.</param>
         /// <returns>The deploy property value.</returns>
-        string ToArtifact(object value, IPropertyType propertyType, ICollection<ArtifactDependency> dependencies);
+        string? ToArtifact(object? value, IPropertyType propertyType, ICollection<ArtifactDependency> dependencies);
 
         /// <summary>
         /// Gets the content property value corresponding to a deploy property value.
@@ -32,6 +32,6 @@ namespace Umbraco.Cms.Core.Deploy
         /// <param name="propertyType">The value property type<</param>
         /// <param name="currentValue">The current content property value.</param>
         /// <returns>The content property value.</returns>
-        object FromArtifact(string value, IPropertyType propertyType, object currentValue);
+        object? FromArtifact(string? value, IPropertyType propertyType, object currentValue);
     }
 }