diff --git a/src/Pharmacist.MsBuild.NuGet/PharmacistNuGetTask.cs b/src/Pharmacist.MsBuild.NuGet/PharmacistNuGetTask.cs
index 5c78290..7ca96bc 100644
--- a/src/Pharmacist.MsBuild.NuGet/PharmacistNuGetTask.cs
+++ b/src/Pharmacist.MsBuild.NuGet/PharmacistNuGetTask.cs
@@ -79,12 +79,6 @@ [new Guid("A3F8F2AB-B479-4A4A-A458-A89E7DC349F1")] = "Xamarin.Mac",
         [Required]
         public string OutputFile { get; set; }
 
-        /// <summary>
-        /// Gets or sets the lock file.
-        /// </summary>
-        [Required]
-        public string LockFile { get; set; }
-
         /// <inheritdoc />
         public override bool Execute()
         {