diff --git a/HISTORY.md b/HISTORY.md
index 3671612766..bf84929b89 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -2,6 +2,9 @@
 
 ## in development:
 
+2024-01-03
+* new dev version for v9.1.2
+
 ## 9.1.1:
 * **Notable Fixes:**
     * fixed using #open: to load a library from a url, thanks, Bernat!
diff --git a/snap.html b/snap.html
index 48dd658ff5..05bd26e45f 100755
--- a/snap.html
+++ b/snap.html
@@ -20,7 +20,7 @@
         <script src="src/threads.js?version=2023-10-29"></script>
         <script src="src/objects.js?version=2023-11-30"></script>
         <script src="src/scenes.js?version=2022-10-29"></script>
-        <script src="src/gui.js?version=2023-12-12"></script>
+        <script src="src/gui.js?version=2024-01-24"></script>
         <script src="src/paint.js?version=2023-05-24"></script>
         <script src="src/lists.js?version=2023-07-24"></script>
         <script src="src/byob.js?version=2023-07-14"></script>
diff --git a/src/gui.js b/src/gui.js
index ec79f15d52..fa3696c282 100644
--- a/src/gui.js
+++ b/src/gui.js
@@ -9,7 +9,7 @@
     written by Jens Mönig
     jens@moenig.org
 
-    Copyright (C) 2023 by Jens Mönig
+    Copyright (C) 2024 by Jens Mönig
 
     This file is part of Snap!.
 
@@ -87,11 +87,11 @@ BlockVisibilityDialogMorph, ThreadManager, isString, SnapExtensions, snapEquals
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.gui = '2023-December-12';
+modules.gui = '2024-January-03';
 
 // Declarations
 
-var SnapVersion = '9.1.1';
+var SnapVersion = '9.1.2-dev';
 
 var IDE_Morph;
 var ProjectDialogMorph;
diff --git a/sw.js b/sw.js
index d71d8726ea..259f64e876 100644
--- a/sw.js
+++ b/sw.js
@@ -1,4 +1,4 @@
-var snapVersion = '9.1.1',
+var snapVersion = '9.1.2-dev',
     cacheName = `snap-pwa-${snapVersion}`,
     filesToCache = [
         'snap.html',