diff --git a/HISTORY.md b/HISTORY.md
index 47a6775560..52ec70ba8f 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -2,6 +2,9 @@
 
 ## in development:
 
+2024-01-15
+* new dev version for v9.2.1
+
 ## 9.2.0:
 * **New Features:**
     * (better) matrix-kernel convolution support, automatic zero-padding
diff --git a/snap.html b/snap.html
index a6e3f3fa6a..3f8565afe7 100755
--- a/snap.html
+++ b/snap.html
@@ -20,7 +20,7 @@
         <script src="src/threads.js?version=2024-01-10"></script>
         <script src="src/objects.js?version=2024-01-10"></script>
         <script src="src/scenes.js?version=2022-10-29"></script>
-        <script src="src/gui.js?version=2024-01-11"></script>
+        <script src="src/gui.js?version=2024-01-15"></script>
         <script src="src/paint.js?version=2023-05-24"></script>
         <script src="src/lists.js?version=2024-01-10"></script>
         <script src="src/byob.js?version=2023-07-14"></script>
diff --git a/src/gui.js b/src/gui.js
index fc89c92129..f0eb34c2f2 100644
--- a/src/gui.js
+++ b/src/gui.js
@@ -87,11 +87,11 @@ BlockVisibilityDialogMorph, ThreadManager, isString, SnapExtensions, snapEquals
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.gui = '2024-January-11';
+modules.gui = '2024-January-15';
 
 // Declarations
 
-var SnapVersion = '9.2.0';
+var SnapVersion = '9.2.1-dev';
 
 var IDE_Morph;
 var ProjectDialogMorph;
diff --git a/sw.js b/sw.js
index 7cd5342fdb..abf3537a05 100644
--- a/sw.js
+++ b/sw.js
@@ -1,4 +1,4 @@
-var snapVersion = '9.2.0',
+var snapVersion = '9.2.1-dev',
     cacheName = `snap-pwa-${snapVersion}`,
     filesToCache = [
         'snap.html',