diff --git a/ietf/meeting/tests_views.py b/ietf/meeting/tests_views.py
index b1bbc62907..1746ed17de 100644
--- a/ietf/meeting/tests_views.py
+++ b/ietf/meeting/tests_views.py
@@ -5220,7 +5220,9 @@ def test_upcoming_ical(self):
         assert_ical_response_is_valid(self, r,
                                       expected_event_summaries=expected_event_summaries,
                                       expected_event_count=len(expected_event_summaries))
-        self.assertContains(r, 'Remote instructions: https://someurl.example.com')
+        # Unfold long lines that might have been folded by iCal
+        content_unfolded = r.content.decode('utf-8').replace('\r\n ', '')
+        self.assertIn('Remote instructions: https://someurl.example.com', content_unfolded)
 
         Session.objects.filter(meeting__type_id='interim').update(remote_instructions='')
         r = self.client.get(url)
@@ -5228,7 +5230,8 @@ def test_upcoming_ical(self):
         assert_ical_response_is_valid(self, r,
                                       expected_event_summaries=expected_event_summaries,
                                       expected_event_count=len(expected_event_summaries))
-        self.assertNotContains(r, 'Remote instructions:')
+        content_unfolded = r.content.decode('utf-8').replace('\r\n ', '')
+        self.assertNotIn('Remote instructions:', content_unfolded)
 
         updated = meeting.updated()
         self.assertIsNotNone(updated)
diff --git a/ietf/meeting/views.py b/ietf/meeting/views.py
index 69635d6219..0c49558c39 100644
--- a/ietf/meeting/views.py
+++ b/ietf/meeting/views.py
@@ -4417,22 +4417,71 @@ def upcoming_ical(request):
     else:
         ietfs = []
 
-    meeting_vtz = {meeting.vtimezone() for meeting in meetings}
-    meeting_vtz.discard(None)
-
-    # icalendar response file should have '\r\n' line endings per RFC5545
-    response = render_to_string('meeting/upcoming.ics', {
-        'vtimezones': ''.join(sorted(meeting_vtz)),
-        'assignments': assignments,
-        'ietfs': ietfs,
-    }, request=request)
-    response = parse_ical_line_endings(response)
+    response = render_upcoming_ical(assignments, ietfs, request)
 
     response = HttpResponse(response, content_type='text/calendar')
     response['Content-Disposition'] = 'attachment; filename="upcoming.ics"'
     return response
     
 
+def render_upcoming_ical(assignments, meetings, request):
+    """Generate upcoming using the icalendar library"""
+
+    cal = Calendar()
+    cal.add("prodid", "-//IETF//datatracker.ietf.org ical upcoming//EN")
+    cal.add("version", "2.0")
+    cal.add("method", "PUBLISH")
+
+    for item in assignments:
+        event = Event()
+
+        event.add("uid", f"ietf-{item.session.meeting.number}-{item.timeslot.pk}")
+        event.add("summary", f"{item.session.group.acronym.lower()} - {item.session.name if item.session.name else item.session.group.name}")
+
+        if item.schedule.meeting.city:
+            event.add("location", f"{item.schedule.meeting.city},{item.schedule.meeting.country}")
+
+        event.add("status", item.session.ical_status)
+        event.add("class", "PUBLIC")
+
+        event.add("dtstart", item.timeslot.utc_start_time())
+        event.add("dtend", item.timeslot.utc_end_time())
+        event.add("dtstamp", item.timeslot.modified)
+        if item.session.agenda():
+            event.add("url", item.session.agenda().get_href())
+
+        description_lines = []
+        if item.timeslot.name:
+            description_lines.append(f"{item.timeslot.name}")
+        if item.session.agenda_note:
+            description_lines.append(f"Note: {item.session.agenda_note}")
+        
+        for material in item.session.materials.all():
+            title_part = f" ({material.title})" if material.type.name != "Agenda" else ""
+            description_lines.append(f"{material.type}{title_part}: {material.get_href()}")
+
+        if item.session.remote_instructions:
+            description_lines.append(f"Remote instructions: {item.session.remote_instructions}")
+
+        event.add("description", "\n".join(description_lines))
+        cal.add_component(event)
+
+    for meeting in meetings:
+        event = Event()
+        event.add("uid", f"ietf-{meeting.number}")
+        event.add("summary", f"IETF {meeting.number}")
+        if meeting.city:
+            event.add("location", f"{meeting.city},{meeting.country}")
+        event.add("class", "PUBLIC")
+        event.add("dtstart", meeting.date)
+        event.add("dtend", meeting.end_date() + datetime.timedelta(days=1))
+        event.add("dtstamp", meeting.cached_updated)
+        event.add("url", f"{request.scheme}://{request.get_host()}{reverse('agenda', kwargs={'num': meeting.number})}")
+
+        cal.add_component(event)
+
+    return cal.to_ical().decode("utf-8")
+
 def upcoming_json(request):
     '''Return Upcoming meetings in json format'''
     today = date_today()
diff --git a/ietf/templates/meeting/upcoming.ics b/ietf/templates/meeting/upcoming.ics
deleted file mode 100644
index 5eca7ec81d..0000000000
--- a/ietf/templates/meeting/upcoming.ics
+++ /dev/null
@@ -1,32 +0,0 @@
-{% load humanize tz %}{% autoescape off %}{% load ietf_filters textfilters %}BEGIN:VCALENDAR
-VERSION:2.0
-METHOD:PUBLISH
-PRODID:-//IETF//datatracker.ietf.org ical upcoming//EN
-{{vtimezones}}{% for item in assignments %}BEGIN:VEVENT
-UID:ietf-{{item.session.meeting.number}}-{{item.timeslot.pk}}
-SUMMARY:{% if item.session.name %}{{item.session.group.acronym|lower}} - {{item.session.name|ics_esc}}{% else %}{{item.session.group.acronym|lower}} - {{item.session.group.name}}{%endif%}
-{% if item.schedule.meeting.city %}LOCATION:{{item.schedule.meeting.city}},{{item.schedule.meeting.country}}
-{% endif %}STATUS:{{item.session.ical_status}}
-CLASS:PUBLIC
-DTSTART{% ics_date_time item.timeslot.local_start_time item.schedule.meeting.time_zone %}
-DTEND{% ics_date_time item.timeslot.local_end_time item.schedule.meeting.time_zone %}
-DTSTAMP{% ics_date_time item.timeslot.modified|utc 'utc' %}{% if item.session.agenda %}
-URL:{{item.session.agenda.get_href}}{% endif %}
-DESCRIPTION:{% if item.timeslot.name %}{{item.timeslot.name|ics_esc}}\n{% endif %}{% if item.session.agenda_note %}
- Note: {{item.session.agenda_note|ics_esc}}\n{% endif %}{% for material in item.session.materials.all %}
- \n{{material.type}}{% if material.type.name != "Agenda" %}
-  ({{material.title|ics_esc}}){% endif %}:
-  {{material.get_href}}\n{% endfor %}{% if item.session.remote_instructions %}
- Remote instructions: {{ item.session.remote_instructions }}\n{% endif %}
-END:VEVENT
-{% endfor %}{% for meeting in ietfs %}BEGIN:VEVENT
-UID:ietf-{{ meeting.number }}
-SUMMARY:IETF {{ meeting.number }}{% if meeting.city %}
-LOCATION:{{ meeting.city }},{{ meeting.country }}{% endif %}
-CLASS:PUBLIC
-DTSTART;VALUE=DATE{% if meeting.time_zone %};TZID={{ meeting.time_zone|ics_esc }}{% endif %}:{{ meeting.date|date:"Ymd" }}
-DTEND;VALUE=DATE{% if meeting.time_zone %};TZID={{ meeting.time_zone|ics_esc }}{% endif %}:{{ meeting.end_date|next_day|date:"Ymd" }}
-DTSTAMP{% ics_date_time meeting.cached_updated|utc 'utc' %}
-URL:{{ request.scheme }}://{{ request.get_host }}{% url 'agenda' num=meeting.number %}
-END:VEVENT
-{% endfor %}END:VCALENDAR{% endautoescape %}