diff --git a/backend/FwLite/LcmCrdt/Changes/CreateEntryChange.cs b/backend/FwLite/LcmCrdt/Changes/CreateEntryChange.cs
index 5de870ac5..bc929f3fb 100644
--- a/backend/FwLite/LcmCrdt/Changes/CreateEntryChange.cs
+++ b/backend/FwLite/LcmCrdt/Changes/CreateEntryChange.cs
@@ -1,7 +1,7 @@
 using System.Text.Json.Serialization;
-using Crdt;
-using Crdt.Changes;
-using Crdt.Entities;
+using SIL.Harmony;
+using SIL.Harmony.Changes;
+using SIL.Harmony.Entities;
 using MiniLcm;
 
 namespace LcmCrdt.Changes;
diff --git a/backend/FwLite/LcmCrdt/Changes/CreateExampleSentenceChange.cs b/backend/FwLite/LcmCrdt/Changes/CreateExampleSentenceChange.cs
index ebcaa5786..5c2db858c 100644
--- a/backend/FwLite/LcmCrdt/Changes/CreateExampleSentenceChange.cs
+++ b/backend/FwLite/LcmCrdt/Changes/CreateExampleSentenceChange.cs
@@ -1,8 +1,8 @@
 using System.Text.Json.Serialization;
-using Crdt;
-using Crdt.Changes;
-using Crdt.Db;
-using Crdt.Entities;
+using SIL.Harmony;
+using SIL.Harmony.Changes;
+using SIL.Harmony.Db;
+using SIL.Harmony.Entities;
 using MiniLcm;
 
 namespace LcmCrdt.Changes;
diff --git a/backend/FwLite/LcmCrdt/Changes/CreateSemanticDomainChange.cs b/backend/FwLite/LcmCrdt/Changes/CreateSemanticDomainChange.cs
index dabac0c13..7ec0c21cb 100644
--- a/backend/FwLite/LcmCrdt/Changes/CreateSemanticDomainChange.cs
+++ b/backend/FwLite/LcmCrdt/Changes/CreateSemanticDomainChange.cs
@@ -1,6 +1,6 @@
-using Crdt;
-using Crdt.Changes;
-using Crdt.Entities;
+using SIL.Harmony;
+using SIL.Harmony.Changes;
+using SIL.Harmony.Entities;
 using MiniLcm;
 using SemanticDomain = LcmCrdt.Objects.SemanticDomain;
 
diff --git a/backend/FwLite/LcmCrdt/Changes/CreateSenseChange.cs b/backend/FwLite/LcmCrdt/Changes/CreateSenseChange.cs
index 206cf425f..9c347364a 100644
--- a/backend/FwLite/LcmCrdt/Changes/CreateSenseChange.cs
+++ b/backend/FwLite/LcmCrdt/Changes/CreateSenseChange.cs
@@ -1,8 +1,8 @@
 using System.Text.Json.Serialization;
-using Crdt;
-using Crdt.Changes;
-using Crdt.Db;
-using Crdt.Entities;
+using SIL.Harmony;
+using SIL.Harmony.Changes;
+using SIL.Harmony.Db;
+using SIL.Harmony.Entities;
 using MiniLcm;
 
 namespace LcmCrdt.Changes;
diff --git a/backend/FwLite/LcmCrdt/Changes/CreateWritingSystemChange.cs b/backend/FwLite/LcmCrdt/Changes/CreateWritingSystemChange.cs
index da04be22c..bef4640ee 100644
--- a/backend/FwLite/LcmCrdt/Changes/CreateWritingSystemChange.cs
+++ b/backend/FwLite/LcmCrdt/Changes/CreateWritingSystemChange.cs
@@ -1,9 +1,9 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Text.Json.Serialization;
-using Crdt;
-using Crdt.Changes;
-using Crdt.Db;
-using Crdt.Entities;
+using SIL.Harmony;
+using SIL.Harmony.Changes;
+using SIL.Harmony.Db;
+using SIL.Harmony.Entities;
 using MiniLcm;
 
 namespace LcmCrdt.Changes;
diff --git a/backend/FwLite/LcmCrdt/Changes/ReplaceSemanticDomainChange.cs b/backend/FwLite/LcmCrdt/Changes/ReplaceSemanticDomainChange.cs
index 8123a96f9..b79ac4cf9 100644
--- a/backend/FwLite/LcmCrdt/Changes/ReplaceSemanticDomainChange.cs
+++ b/backend/FwLite/LcmCrdt/Changes/ReplaceSemanticDomainChange.cs
@@ -1,5 +1,5 @@
-using Crdt.Changes;
-using Crdt.Entities;
+using SIL.Harmony.Changes;
+using SIL.Harmony.Entities;
 using MiniLcm;
 
 namespace LcmCrdt.Changes;
diff --git a/backend/FwLite/LcmCrdt/Changes/SetPartOfSpeechChange.cs b/backend/FwLite/LcmCrdt/Changes/SetPartOfSpeechChange.cs
index 59922adf7..046563e8f 100644
--- a/backend/FwLite/LcmCrdt/Changes/SetPartOfSpeechChange.cs
+++ b/backend/FwLite/LcmCrdt/Changes/SetPartOfSpeechChange.cs
@@ -1,5 +1,5 @@
-using Crdt.Changes;
-using Crdt.Entities;
+using SIL.Harmony.Changes;
+using SIL.Harmony.Entities;
 
 namespace LcmCrdt.Changes;
 
diff --git a/backend/FwLite/LcmCrdt/Objects/ExampleSentence.cs b/backend/FwLite/LcmCrdt/Objects/ExampleSentence.cs
index 91036aec5..d346010a4 100644
--- a/backend/FwLite/LcmCrdt/Objects/ExampleSentence.cs
+++ b/backend/FwLite/LcmCrdt/Objects/ExampleSentence.cs
@@ -1,7 +1,7 @@
 using System.Text.Json;
-using Crdt;
-using Crdt.Db;
-using Crdt.Entities;
+using SIL.Harmony;
+using SIL.Harmony.Db;
+using SIL.Harmony.Entities;
 
 namespace LcmCrdt.Objects;
 
diff --git a/backend/FwLite/LcmCrdt/Objects/PartOfSpeech.cs b/backend/FwLite/LcmCrdt/Objects/PartOfSpeech.cs
index 997c2c420..8a02338af 100644
--- a/backend/FwLite/LcmCrdt/Objects/PartOfSpeech.cs
+++ b/backend/FwLite/LcmCrdt/Objects/PartOfSpeech.cs
@@ -1,5 +1,5 @@
-using Crdt;
-using Crdt.Entities;
+using SIL.Harmony;
+using SIL.Harmony.Entities;
 using LcmCrdt.Changes;
 using MiniLcm;
 
diff --git a/backend/FwLite/LcmCrdt/Objects/Sense.cs b/backend/FwLite/LcmCrdt/Objects/Sense.cs
index dcc46d282..c1ed13b43 100644
--- a/backend/FwLite/LcmCrdt/Objects/Sense.cs
+++ b/backend/FwLite/LcmCrdt/Objects/Sense.cs
@@ -1,7 +1,7 @@
-using Crdt;
-using Crdt.Changes;
-using Crdt.Db;
-using Crdt.Entities;
+using SIL.Harmony;
+using SIL.Harmony.Changes;
+using SIL.Harmony.Db;
+using SIL.Harmony.Entities;
 using LcmCrdt.Changes;
 using LcmCrdt.Utils;
 using SystemTextJsonPatch;
diff --git a/backend/FwLite/LcmCrdt/Utils/JsonPatchRewriter.cs b/backend/FwLite/LcmCrdt/Utils/JsonPatchRewriter.cs
index 3dbe5ba45..3aa41fb52 100644
--- a/backend/FwLite/LcmCrdt/Utils/JsonPatchRewriter.cs
+++ b/backend/FwLite/LcmCrdt/Utils/JsonPatchRewriter.cs
@@ -4,7 +4,7 @@
 using System.Runtime.CompilerServices;
 using System.Text.Json;
 using System.Text.Json.Serialization;
-using Crdt.Changes;
+using SIL.Harmony.Changes;
 using SystemTextJsonPatch;
 using SystemTextJsonPatch.Internal;
 using SystemTextJsonPatch.Operations;
diff --git a/backend/LexBoxApi/Controllers/CrdtController.cs b/backend/LexBoxApi/Controllers/CrdtController.cs
index 5fb268925..eaaa8cf8c 100644
--- a/backend/LexBoxApi/Controllers/CrdtController.cs
+++ b/backend/LexBoxApi/Controllers/CrdtController.cs
@@ -1,4 +1,4 @@
-using Crdt.Core;
+using SIL.Harmony.Core;
 using LexBoxApi.Auth.Attributes;
 using LexData;
 using Microsoft.AspNetCore.Mvc;