diff --git a/oioioi/globalmessage/admin.py b/oioioi/globalmessage/admin.py
index 4234ca94a..40c6f258f 100644
--- a/oioioi/globalmessage/admin.py
+++ b/oioioi/globalmessage/admin.py
@@ -1,3 +1,5 @@
+from django.forms import ModelForm
+from django.http import HttpRequest
 from django.urls import re_path, reverse
 from django.utils.translation import gettext_lazy as _
 
@@ -5,7 +7,6 @@
 from oioioi.base.permissions import is_superuser
 from oioioi.globalmessage.models import GlobalMessage
 
-
 class GlobalMessageAdmin(admin.ModelAdmin):
     fieldsets = [
         (None, {'fields': ['enabled', 'message']}),
@@ -33,6 +34,10 @@ def get_urls(self):
 
         return custom_urls + urls
 
+    def save_model(self, request: HttpRequest, obj: GlobalMessage, form: ModelForm, change: bool) -> None:
+        obj.updated = request.timestamp
+        return super().save_model(request, obj, form, change)
+
 
 admin.site.register(GlobalMessage, GlobalMessageAdmin)
 
diff --git a/oioioi/globalmessage/migrations/0002_globalmessage_updated.py b/oioioi/globalmessage/migrations/0002_globalmessage_updated.py
new file mode 100644
index 000000000..ebbc35c91
--- /dev/null
+++ b/oioioi/globalmessage/migrations/0002_globalmessage_updated.py
@@ -0,0 +1,20 @@
+# Generated by Django 4.2.11 on 2024-10-21 20:48
+
+import django
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('globalmessage', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='globalmessage',
+            name='updated',
+            field=models.DateTimeField(default=django.utils.timezone.now, verbose_name='updated'),
+            preserve_default=False,
+        ),
+    ]
diff --git a/oioioi/globalmessage/models.py b/oioioi/globalmessage/models.py
index 8a3523f46..ff3ec5909 100644
--- a/oioioi/globalmessage/models.py
+++ b/oioioi/globalmessage/models.py
@@ -9,6 +9,7 @@ class GlobalMessage(models.Model):
     enabled = models.BooleanField(default=False, verbose_name=_("enabled"))
     start = models.DateTimeField(null=True, blank=True, verbose_name=_("start"))
     end = models.DateTimeField(null=True, blank=True, verbose_name=_("end"))
+    updated = models.DateTimeField(null=False, blank=False, verbose_name=_("updated"))
 
     def visible(self, timestamp):
         return (
diff --git a/oioioi/globalmessage/processors.py b/oioioi/globalmessage/processors.py
index 813cfd9b4..a36b605e5 100644
--- a/oioioi/globalmessage/processors.py
+++ b/oioioi/globalmessage/processors.py
@@ -16,10 +16,12 @@ def global_message_processor(request):
     if message.visible(time):
         return {
             'extra_body_global_message': render_to_string(
-                'global-message-user.html', {'global_message': message}
+                'global-message-user.html',
+                {'global_message': message, 'updated': message.updated.strftime('%s')},
             ),
             'extra_admin_global_message': render_to_string(
-                'global-message-admin.html', {'global_message': message}
+                'global-message-admin.html',
+                {'global_message': message, 'updated': message.updated.strftime('%s')},
             ),
         }
 
diff --git a/oioioi/globalmessage/templates/global-message-admin.html b/oioioi/globalmessage/templates/global-message-admin.html
index c266a5d5b..7bbe8c581 100644
--- a/oioioi/globalmessage/templates/global-message-admin.html
+++ b/oioioi/globalmessage/templates/global-message-admin.html
@@ -1,3 +1,3 @@
-<div id="global-message-admin" class="full-bootstrap">
+<div id="global-message-admin" class="full-bootstrap" data-updated="{{ updated }}">
     {% include "global-message.html" %}
-</div>
\ No newline at end of file
+</div>
diff --git a/oioioi/globalmessage/templates/global-message-user.html b/oioioi/globalmessage/templates/global-message-user.html
index b73dfd05b..5ff6c1ff3 100644
--- a/oioioi/globalmessage/templates/global-message-user.html
+++ b/oioioi/globalmessage/templates/global-message-user.html
@@ -1,3 +1,3 @@
-<div id="global-message-user">
+<div id="global-message-user" data-updated="{{ updated }}">
     {% include "global-message.html" %}
-</div>
\ No newline at end of file
+</div>
diff --git a/oioioi/globalmessage/templates/global-message.html b/oioioi/globalmessage/templates/global-message.html
index d056b0d73..46f6d95ae 100644
--- a/oioioi/globalmessage/templates/global-message.html
+++ b/oioioi/globalmessage/templates/global-message.html
@@ -1 +1,32 @@
-<div class="alert alert-info">{{ global_message }}</div>
\ No newline at end of file
+<div class="alert alert-info">
+    <button type="button" class="close" aria-label="Close" id="global-message-close" style="display:none;">
+        <span aria-hidden="true">×</span>
+    </button>
+    {{ global_message|safe }}
+</div>
+<script>
+    (() => {
+        const $globalMsgClose = document.getElementById("global-message-close");
+        const $globalMsgRoot =
+            document.getElementById("global-message-user") ||
+            document.getElementById("global-message-admin");
+        if ($globalMsgClose == null) {
+            throw new Error("No GlobalMessage close button found");
+        }
+        if ($globalMsgRoot == null) {
+            throw new Error("No GlobalMessage root element found");
+        }
+        $globalMsgClose.style.display = "";
+        const globalMsgData = localStorage.getItem("globalmessage_dismissed");
+        if (globalMsgData === $globalMsgRoot.dataset.updated) {
+            $globalMsgRoot.style.display = "none";
+        }
+        $globalMsgClose.addEventListener("click", (e) => {
+            $globalMsgRoot.style.display = "none";
+            localStorage.setItem(
+                "globalmessage_dismissed",
+                $globalMsgRoot.dataset.updated,
+            );
+        });
+    })();
+</script>