diff --git a/src/FlUnit/FlUnit.csproj b/src/FlUnit/FlUnit.csproj
index 8a2f270..bd63340 100644
--- a/src/FlUnit/FlUnit.csproj
+++ b/src/FlUnit/FlUnit.csproj
@@ -65,7 +65,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="FlUnit.Abstractions" Version="3.0.0" />
+    <PackageReference Include="FlUnit.Abstractions" Version="4.0.0" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
diff --git a/src/FlUnit/Trait.cs b/src/FlUnit/Trait.cs
deleted file mode 100644
index 566f2ae..0000000
--- a/src/FlUnit/Trait.cs
+++ /dev/null
@@ -1,27 +0,0 @@
-namespace FlUnit
-{
-    /// <summary>
-    /// Representation of a test trait.
-    /// </summary>
-    public sealed class Trait : ITrait
-    {
-        /// <summary>
-        /// Initializes a new instance of the <see cref="Trait"/> class.
-        /// </summary>
-        /// <param name="name">The name of the trait.</param>
-        public Trait(string name) => Name = name;
-
-        /// <summary>
-        /// Initializes a new instance of the <see cref="ITrait"/> class.
-        /// </summary>
-        /// <param name="name">The name of the trait.</param>
-        /// <param name="value">The value of the trait.</param>
-        public Trait(string name, string value) => (Name, Value) = (name, value);
-
-        /// <inheritdoc />
-        public string Name { get; }
-
-        /// <inheritdoc />
-        public string Value { get; }
-    }
-}
diff --git a/src/FlUnit/TraitAttribute.cs b/src/FlUnit/TraitAttribute.cs
deleted file mode 100644
index 5262085..0000000
--- a/src/FlUnit/TraitAttribute.cs
+++ /dev/null
@@ -1,30 +0,0 @@
-using System;
-using System.Reflection;
-
-namespace FlUnit
-{
-    /// <summary>
-    /// Attribute used to decorate a test, test class, or assembly with arbitrary name/value pairs ("traits").
-    /// </summary>
-    [AttributeUsage(AttributeTargets.Property | AttributeTargets.Class | AttributeTargets.Assembly, AllowMultiple = true)]
-	public sealed class TraitAttribute : Attribute, ITraitProvider
-	{
-		private readonly ITrait trait;
-
-		/// <summary>
-		/// Creates a new instance of the <see cref="TraitAttribute"/> class.
-		/// </summary>
-		/// <param name="name">The trait name.</param>
-		public TraitAttribute(string name) => trait = new Trait(name);
-
-		/// <summary>
-		/// Creates a new instance of the <see cref="TraitAttribute"/> class.
-		/// </summary>
-		/// <param name="name">The trait name.</param>
-		/// <param name="value">The trait value.</param>
-		public TraitAttribute(string name, string value) => trait = new Trait(name, value);
-
-		/// <inheritdoc/>
-		public ITrait GetTrait(PropertyInfo testProperty) => trait;
-	}
-}