diff --git a/HISTORY.md b/HISTORY.md
index be1d5c31..87120a02 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -5,11 +5,13 @@
 * **Notable Changes:**
 * **Notable Fixes:**
     * list watchers occasionally didn't show cells after reassigning a changed list to a variable
+    * FOREACH over a linked list failed for scripts mutating it
 * **Translation Updates:**
 
 ### 2019-07-01
 * new dev version
 * lists: fixed #2446
+* threads: fixed an issue when iterating over a linked list with a script mutating it, thanks, Brian! 
 
 ## v5
 ### 2019-06-27
diff --git a/snap.html b/snap.html
index d07fe4b8..6588f793 100755
--- a/snap.html
+++ b/snap.html
@@ -7,7 +7,7 @@
         <script type="text/javascript" src="src/morphic.js?version=2019-06-27"></script>
         <script type="text/javascript" src="src/widgets.js?version=2019-06-27"></script>
         <script type="text/javascript" src="src/blocks.js?version=2019-06-27"></script>
-        <script type="text/javascript" src="src/threads.js?version=2019-06-27"></script>
+        <script type="text/javascript" src="src/threads.js?version=2019-07-01"></script>
         <script type="text/javascript" src="src/objects.js?version=2019-06-27"></script>
         <script type="text/javascript" src="src/gui.js?version=2019-07-01"></script>
         <script type="text/javascript" src="src/paint.js?version=2019-06-27"></script>
diff --git a/src/threads.js b/src/threads.js
index a9c5ed8e..1cbb601d 100644
--- a/src/threads.js
+++ b/src/threads.js
@@ -61,7 +61,7 @@ StageMorph, SpriteMorph, StagePrompterMorph, Note, modules, isString, copy,
 isNil, WatcherMorph, List, ListWatcherMorph, alert, console, TableMorph, Color,
 TableFrameMorph, ColorSlotMorph, isSnapObject, Map, newCanvas, Symbol*/
 
-modules.threads = '2019-June-25';
+modules.threads = '2019-July-01';
 
 var ThreadManager;
 var Process;
@@ -2173,8 +2173,6 @@ Process.prototype.doWaitUntil = function (goalCondition) {
 // Process interpolated iteration primitives
 
 Process.prototype.doForEach = function (upvar, list, script) {
-
-//Process.prototype.reportFindFirst = function (predicate, list) {
     // perform a script for each element of a list, assigning the
     // current iteration's element to a variable with the name
     // specified in the "upvar" parameter, so it can be referenced