diff --git a/backend/LeedsBeerQuest.API/LeedsBeerQuest.API.Tests/Data/Services/TestData.cs b/backend/LeedsBeerQuest.API/LeedsBeerQuest.API.Tests/Data/Services/TestData.cs
index e77bde4..5b08319 100644
--- a/backend/LeedsBeerQuest.API/LeedsBeerQuest.API.Tests/Data/Services/TestData.cs
+++ b/backend/LeedsBeerQuest.API/LeedsBeerQuest.API.Tests/Data/Services/TestData.cs
@@ -6,7 +6,7 @@ namespace LeedsBeerQuest.API.Tests.Data.Services;
 
 public static class TestData
 {
-    public static IEnumerable<Venue> VenueTestData = new[]
+    public static readonly IEnumerable<Venue> VenueTestData = new[]
     {
         new Venue
         {