diff --git a/evolution.spec b/evolution.spec
index ad857bb..9c5b608 100644
--- a/evolution.spec
+++ b/evolution.spec
@@ -43,7 +43,7 @@
 
 Name: evolution
 Version: 3.40.4
-Release: 11%{?dist}
+Release: 12%{?dist}
 Summary: Mail and calendar client for GNOME
 License: GPLv2+ and GFDL
 URL: https://wiki.gnome.org/Apps/Evolution
@@ -60,6 +60,7 @@ Patch05: webkitgtk-2.36.0-disable-hw-accel.patch
 Patch06: evolution-3.40.4-frame-flattenning.patch
 Patch07: evolution-3.40.4-new-button.patch
 Patch08: webkitgtk-2.46.1-middle-click-paste.patch
+Patch09: webkitgtk-2.49.4-fix-JavaScript-code.patch
 
 # Approximate version number
 Provides: bundled(libgnomecanvas) = 2.30.0
@@ -576,6 +577,9 @@ grep -v "%{_datadir}/locale" evolution.lang > help.lang
 %endif
 
 %changelog
+* Mon Sep 01 2025 Milan Crha <mcrha@redhat.com> - 3.40.4-12
+- Resolves: RHEL-111953 (WebKitGTK 2.49.4: JavaScript evaluation result serialization changes)
+
 * Tue Oct 15 2024 Milan Crha <mcrha@redhat.com> - 3.40.4-11
 - Resolves: RHEL-62668 (WebKitGTK 2.46.1: Middle mouse button inserts primary clipboard twice)
 
diff --git a/webkitgtk-2.49.4-fix-JavaScript-code.patch b/webkitgtk-2.49.4-fix-JavaScript-code.patch
new file mode 100644
index 0000000..55a1638
--- /dev/null
+++ b/webkitgtk-2.49.4-fix-JavaScript-code.patch
@@ -0,0 +1,72 @@
+diff -up evolution-3.40.4/data/webkit/e-editor.js.9 evolution-3.40.4/data/webkit/e-editor.js
+--- evolution-3.40.4/data/webkit/e-editor.js.9	2021-08-13 11:50:35.000000000 +0200
++++ evolution-3.40.4/data/webkit/e-editor.js	2025-09-01 10:37:18.105962005 +0200
+@@ -4060,7 +4060,7 @@ EvoEditor.LinkGetProperties = function()
+ 	var res = null, anchor = EvoEditor.getParentElement("A", null, false);
+ 
+ 	if (anchor) {
+-		res = [];
++		res = {};
+ 		res["href"] = anchor.href;
+ 		res["text"] = anchor.innerText;
+ 	} else if (!document.getSelection().isCollapsed && document.getSelection().rangeCount > 0) {
+@@ -4069,7 +4069,7 @@ EvoEditor.LinkGetProperties = function()
+ 		range = document.getSelection().getRangeAt(0);
+ 
+ 		if (range) {
+-			res = [];
++			res = {};
+ 			res["text"] = range.toString();
+ 		}
+ 	}
+@@ -5131,7 +5131,7 @@ EvoEditor.InsertSignature = function(con
+ 		EvoUndoRedo.StopRecord(EvoUndoRedo.RECORD_KIND_GROUP, "InsertSignature");
+ 	}
+ 
+-	var res = [];
++	var res = {};
+ 
+ 	res["fromMessage"] = fromMessage;
+ 	res["checkChanged"] = checkChanged;
+@@ -6277,7 +6277,7 @@ EvoEditor.onContextMenu = function(event
+ 	if (document.getSelection().isCollapsed)
+ 		nodeFlags |= EvoEditor.E_CONTENT_EDITOR_NODE_IS_TEXT_COLLAPSED;
+ 
+-	res = [];
++	res = {};
+ 
+ 	res["nodeFlags"] = nodeFlags;
+ 	res["caretWord"] = EvoEditor.GetCaretWord();
+diff -up evolution-3.40.4/data/webkit/e-web-view.js.9 evolution-3.40.4/data/webkit/e-web-view.js
+--- evolution-3.40.4/data/webkit/e-web-view.js.9	2025-09-01 10:31:15.781824966 +0200
++++ evolution-3.40.4/data/webkit/e-web-view.js	2025-09-01 10:31:15.809863550 +0200
+@@ -357,7 +357,7 @@ Evo.elementClicked = function(elem)
+ 		dom_window = parent_dom_window;
+ 	}
+ 
+-	var res = [];
++	var res = {};
+ 
+ 	res["iframe-id"] = parent_iframe_id;
+ 	res["elem-id"] = elem.id;
+@@ -575,7 +575,7 @@ Evo.GetElementFromPoint = function(xx, y
+ 	if (!elem)
+ 		return null;
+ 
+-	var res = [], iframe;
++	var res = {}, iframe;
+ 
+ 	iframe = elem.ownerDocument.defaultView.frameElement;
+ 
+diff -up evolution-3.40.4/src/e-util/test-web-view-jsc.c.9 evolution-3.40.4/src/e-util/test-web-view-jsc.c
+--- evolution-3.40.4/src/e-util/test-web-view-jsc.c.9	2021-08-13 11:50:35.000000000 +0200
++++ evolution-3.40.4/src/e-util/test-web-view-jsc.c	2025-09-01 10:31:15.810142321 +0200
+@@ -536,7 +536,7 @@ test_jsc_object_properties (TestFixture
+ 	str = e_web_view_jsc_printf_script (
+ 		"test_obj_props = function()\n"
+ 		"{\n"
+-		"	var arrobj = [];\n"
++		"	var arrobj = {};\n"
+ 		"	arrobj[\"btrue\"] = true;\n"
+ 		"	arrobj[\"bfalse\"] = false;\n"
+ 		"	arrobj[\"i2\"] = 2;\n"