diff --git a/HISTORY.md b/HISTORY.md
index 14fe2689b..7f60dd46a 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -2,8 +2,13 @@
 
 ## in development:
 
+## 10.1.6:
+* **Notable Fixes:**
+    * fixed #3409 - do not remove custom blocks referenced in customized primitives as "unused"
+
 ### 2024-09-18
 * objects: fixed #3409 - do not remove custom blocks referenced in customized primitives as "unused" 
+* prepared v10.1.6 patch
 
 ## 10.1.5:
 * **Notable Fixes:**
diff --git a/snap.html b/snap.html
index 1a6850867..b301e7aac 100755
--- a/snap.html
+++ b/snap.html
@@ -20,7 +20,7 @@
         <script src="src/threads.js?version=2024-10-15"></script>
         <script src="src/objects.js?version=2024-10-18"></script>
         <script src="src/scenes.js?version=2024-05-28"></script>
-        <script src="src/gui.js?version=2024-10-15"></script>
+        <script src="src/gui.js?version=2024-10-18"></script>
         <script src="src/paint.js?version=2023-05-24"></script>
         <script src="src/lists.js?version=2024-09-16"></script>
         <script src="src/byob.js?version=2024-10-10"></script>
diff --git a/src/gui.js b/src/gui.js
index aee1efe91..02caa050a 100644
--- a/src/gui.js
+++ b/src/gui.js
@@ -87,11 +87,11 @@ BlockVisibilityDialogMorph, ThreadManager, isString, SnapExtensions, snapEquals
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.gui = '2024-October-15';
+modules.gui = '2024-October-18';
 
 // Declarations
 
-var SnapVersion = '10.1.5';
+var SnapVersion = '10.1.6';
 
 var IDE_Morph;
 var ProjectDialogMorph;
diff --git a/sw.js b/sw.js
index aa8e97888..2f9b086b9 100644
--- a/sw.js
+++ b/sw.js
@@ -1,6 +1,6 @@
 /*global self, caches*/
 /*jshint esversion: 6*/
-var snapVersion = '10.1.5',
+var snapVersion = '10.1.6',
     cacheName = `snap-pwa-${snapVersion}`,
     filesToCache = [
         'snap.html',