diff --git a/dev/Common/Utils.js b/dev/Common/Utils.js
index ed395fbd7..6383d500e 100644
--- a/dev/Common/Utils.js
+++ b/dev/Common/Utils.js
@@ -34,7 +34,7 @@ export const
 			target[key] = /*isArray(value) ? ko.observableArray(value) :*/ ko.observable(value) ),
 
 	addComputablesTo = (target, computables) =>
-		forEachObjectEntry(computables, (key, fn) => target[key] = ko.computed(fn)),
+		forEachObjectEntry(computables, (key, fn) => target[key] = ko.computed(fn, {'pure':true})),
 
 	addSubscribablesTo = (target, subscribables) =>
 		forEachObjectEntry(subscribables, (key, fn) => target[key].subscribe(fn)),
diff --git a/dev/External/ko.js b/dev/External/ko.js
index 22b7e501e..02b3af11b 100644
--- a/dev/External/ko.js
+++ b/dev/External/ko.js
@@ -8,7 +8,7 @@ import { arrayLength, isFunction } from 'Common/Utils';
  * number of evaluations or other “hidden” information. Its value should be
  * based solely on the values of other observables in the application
  */
-export const koComputable = ko.pureComputed;
+export const koComputable = fn => ko.computed(fn, {'pure':true});
 
 ko.bindingHandlers.tooltipErrorTip = {
 	init: (element, fValueAccessor) => {
diff --git a/dev/Settings/User/Contacts.js b/dev/Settings/User/Contacts.js
index 3ef055716..b3a7dd71f 100644
--- a/dev/Settings/User/Contacts.js
+++ b/dev/Settings/User/Contacts.js
@@ -1,4 +1,5 @@
 import ko from 'ko';
+import { koComputable } from 'External/ko';
 
 import { SettingsGet } from 'Common/Globals';
 import { ContactUserStore } from 'Stores/User/Contact';
@@ -14,8 +15,7 @@ export class ContactsUserSettings /*extends AbstractViewSettings*/ {
 		this.contactsSyncUser = ContactUserStore.syncUser;
 		this.contactsSyncPass = ContactUserStore.syncPass;
 
-		this.saveTrigger = ko
-			.computed(() =>
+		this.saveTrigger = koComputable(() =>
 				[
 					ContactUserStore.enableSync() ? '1' : '0',
 					ContactUserStore.syncUrl(),
diff --git a/dev/Stores/User/Message.js b/dev/Stores/User/Message.js
index 7699958de..6c0cf90e2 100644
--- a/dev/Stores/User/Message.js
+++ b/dev/Stores/User/Message.js
@@ -1,4 +1,5 @@
 import ko from 'ko';
+import { koComputable } from 'External/ko';
 
 import { Scope, Notification } from 'Common/Enums';
 import { MessageSetAction } from 'Common/EnumsUser';
@@ -149,16 +150,13 @@ export const MessageUserStore = new class {
 			}
 		});
 
-		this.listChecked = ko
-			.computed(() => this.list.filter(isChecked))
+		this.listChecked = koComputable(() => this.list.filter(isChecked))
 			.extend({ rateLimit: 0 });
 
-		this.hasCheckedMessages = ko
-			.computed(() => !!this.list.find(isChecked))
+		this.hasCheckedMessages = koComputable(() => !!this.list.find(isChecked))
 			.extend({ rateLimit: 0 });
 
-		this.hasCheckedOrSelected = ko
-			.computed(() => !!(this.selectorMessageSelected()
+		this.hasCheckedOrSelected = koComputable(() => !!(this.selectorMessageSelected()
 				|| this.selectorMessageFocused()
 				|| this.list.find(item => item.checked())))
 			.extend({ rateLimit: 50 });
diff --git a/dev/View/Admin/Settings/Pane.js b/dev/View/Admin/Settings/Pane.js
index c6148dd78..5233313ed 100644
--- a/dev/View/Admin/Settings/Pane.js
+++ b/dev/View/Admin/Settings/Pane.js
@@ -1,4 +1,5 @@
 import ko from 'ko';
+import { koComputable } from 'External/ko';
 
 import Remote from 'Remote/Admin/Fetch';
 
@@ -16,8 +17,7 @@ class PaneSettingsAdminView extends AbstractViewRight {
 
 		this.leftPanelDisabled = leftPanelDisabled;
 
-		this.adminManLoadingVisibility = ko
-			.computed(() => PackageAdminStore.loading() ? 'visible' : 'hidden');
+		this.adminManLoadingVisibility = koComputable(() => PackageAdminStore.loading() ? 'visible' : 'hidden');
 	}
 
 	logoutClick() {
diff --git a/vendors/knockout/build/output/knockout-latest.debug.js b/vendors/knockout/build/output/knockout-latest.debug.js
index 7fd45c1d6..62c695565 100644
--- a/vendors/knockout/build/output/knockout-latest.debug.js
+++ b/vendors/knockout/build/output/knockout-latest.debug.js
@@ -1392,7 +1392,6 @@ ko.pureComputed = (evaluatorFunctionOrOptions) => {
     evaluatorFunctionOrOptions['pure'] = true;
     return ko.computed(evaluatorFunctionOrOptions);
 };
-ko.exportSymbol('pureComputed', ko.pureComputed);
 (() => {
     var hasDomDataExpandoProperty = '__ko__hasDomDataOptionValue__';
 
diff --git a/vendors/knockout/build/output/knockout-latest.js b/vendors/knockout/build/output/knockout-latest.js
index f448e9508..7c0af97ba 100644
--- a/vendors/knockout/build/output/knockout-latest.js
+++ b/vendors/knockout/build/output/knockout-latest.js
@@ -4,60 +4,60 @@
  * License: MIT (http://www.opensource.org/licenses/mit-license.php)
  */
 
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diff --git a/vendors/knockout/src/subscribables/dependentObservable.js b/vendors/knockout/src/subscribables/dependentObservable.js
index 62e156015..b0f65ef9e 100644
--- a/vendors/knockout/src/subscribables/dependentObservable.js
+++ b/vendors/knockout/src/subscribables/dependentObservable.js
@@ -483,4 +483,3 @@ ko.pureComputed = (evaluatorFunctionOrOptions) => {
     evaluatorFunctionOrOptions['pure'] = true;
     return ko.computed(evaluatorFunctionOrOptions);
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