diff --git a/HISTORY.md b/HISTORY.md
index 90159c3d..c7f31687 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -5,6 +5,7 @@
### 2019-01-02
* Objects, Blocks, Threads, GUI, Store: added third color dimension and transparency to pen
* renamed help screens for "setHue" to "setPenHSVA" and "changeHue" to "changePenHSVA"
+* pushed dev version to 4.2.3
### 2019-01-01
* Morphic: added HSL color conversion support
diff --git a/snap.html b/snap.html
index e3718f76..3bbb2242 100755
--- a/snap.html
+++ b/snap.html
@@ -2,7 +2,7 @@
- Snap! Build Your Own Blocks 4.2.2.10 - dev -
+ Snap! Build Your Own Blocks 4.2.3 - dev -
diff --git a/src/gui.js b/src/gui.js
index e5d39c53..16d141c0 100644
--- a/src/gui.js
+++ b/src/gui.js
@@ -3558,7 +3558,7 @@ IDE_Morph.prototype.aboutSnap = function () {
module, btn1, btn2, btn3, btn4, licenseBtn, translatorsBtn,
world = this.world();
- aboutTxt = 'Snap! 4.2.2.10 - dev -\nBuild Your Own Blocks\n\n'
+ aboutTxt = 'Snap! 4.2.3 - dev -\nBuild Your Own Blocks\n\n'
+ 'Copyright \u24B8 2018 Jens M\u00F6nig and '
+ 'Brian Harvey\n'
+ 'jens@moenig.org, bh@cs.berkeley.edu\n\n'