diff --git a/history.txt b/history.txt
index 477aa66f..1c18fb39 100755
--- a/history.txt
+++ b/history.txt
@@ -3880,6 +3880,7 @@ Fixes:
 180201
 ------
 * GUI: encode recorded sounds to base64
+* snap.html: added version queries to script urls
 
 
 v4.1.1 New Features:
diff --git a/snap.html b/snap.html
index 499f9be8..5a5ef4a3 100755
--- a/snap.html
+++ b/snap.html
@@ -4,23 +4,23 @@
 		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 		<title>Snap! Build Your Own Blocks</title>
 		<link rel="shortcut icon" href="favicon.ico">
-		<script type="text/javascript" src="morphic.js"></script>
-		<script type="text/javascript" src="widgets.js"></script>
-		<script type="text/javascript" src="blocks.js"></script>
-		<script type="text/javascript" src="threads.js"></script>
-		<script type="text/javascript" src="objects.js"></script>
-		<script type="text/javascript" src="gui.js"></script>
-		<script type="text/javascript" src="paint.js"></script>
-		<script type="text/javascript" src="lists.js"></script>
-		<script type="text/javascript" src="byob.js"></script>
-		<script type="text/javascript" src="tables.js"></script>
-		<script type="text/javascript" src="symbols.js"></script>
-		<script type="text/javascript" src="xml.js"></script>
-		<script type="text/javascript" src="store.js"></script>
-		<script type="text/javascript" src="locale.js"></script>
-		<script type="text/javascript" src="cloud.js"></script>
-		<script type="text/javascript" src="sha512.js"></script>
-		<script type="text/javascript" src="FileSaver.min.js"></script>
+		<script type="text/javascript" src="morphic.js?version='2018-02-01"></script>
+		<script type="text/javascript" src="widgets.js?version='2018-02-01"></script>
+		<script type="text/javascript" src="blocks.js?version='2018-02-01"></script>
+		<script type="text/javascript" src="threads.js?version='2018-02-01"></script>
+		<script type="text/javascript" src="objects.js?version='2018-02-01"></script>
+		<script type="text/javascript" src="gui.js?version='2018-02-01"></script>
+		<script type="text/javascript" src="paint.js?version='2018-02-01"></script>
+		<script type="text/javascript" src="lists.js?version='2018-02-01"></script>
+		<script type="text/javascript" src="byob.js?version='2018-02-01"></script>
+		<script type="text/javascript" src="tables.js?version='2018-02-01"></script>
+		<script type="text/javascript" src="symbols.js?version='2018-02-01"></script>
+		<script type="text/javascript" src="xml.js?version='2018-02-01"></script>
+		<script type="text/javascript" src="store.js?version='2018-02-01"></script>
+		<script type="text/javascript" src="locale.js?version='2018-02-01"></script>
+		<script type="text/javascript" src="cloud.js?version='2018-02-01"></script>
+		<script type="text/javascript" src="sha512.js?version='2018-02-01"></script>
+		<script type="text/javascript" src="FileSaver.min.js?version='2018-02-01"></script>
 		<script type="text/javascript">
 			var world;
 			window.onload = function () {