diff --git a/CHANGELOG.md b/CHANGELOG.md
index c01da45..4bb582e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 ### Added
 - Agent safety: add baked safety-profile builds for fail-closed agent binaries, with `agent-safe`, `readonly`, and `full` profiles, filtered help/schema output, docs, and build tooling. (#366, #239) — thanks @drewburchfield.
+- Calendar: add `--with-meet` to `calendar update` for adding Google Meet conferencing to existing events. (#538) — thanks @alexisperumal.
 - Docs: add `docs add-tab`, `docs rename-tab`, and `docs delete-tab` for managing Google Docs tabs. (#547) — thanks @chopenhauer.
 - Docs: support tab-scoped Markdown append and find-replace flows. (#541) — thanks @donbowman.
 
diff --git a/internal/cmd/calendar_create_update_test.go b/internal/cmd/calendar_create_update_test.go
index 0ed13f8..11f1689 100644
--- a/internal/cmd/calendar_create_update_test.go
+++ b/internal/cmd/calendar_create_update_test.go
@@ -335,6 +335,56 @@ func TestCalendarUpdateCmd_RunJSON(t *testing.T) {
 	}
 }
 
+func TestCalendarUpdateCmd_WithMeet(t *testing.T) {
+	origNew := newCalendarService
+	t.Cleanup(func() { newCalendarService = origNew })
+
+	var (
+		sawConferenceData bool
+		sawVersion        bool
+	)
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		path := strings.TrimPrefix(r.URL.Path, "/calendar/v3")
+		if r.Method == http.MethodPatch && path == "/calendars/cal@example.com/events/ev" {
+			sawVersion = r.URL.Query().Get("conferenceDataVersion") == "1"
+			var body calendar.Event
+			_ = json.NewDecoder(r.Body).Decode(&body)
+			sawConferenceData = body.ConferenceData != nil &&
+				body.ConferenceData.CreateRequest != nil &&
+				body.ConferenceData.CreateRequest.ConferenceSolutionKey != nil &&
+				body.ConferenceData.CreateRequest.ConferenceSolutionKey.Type == "hangoutsMeet"
+			w.Header().Set("Content-Type", "application/json")
+			_ = json.NewEncoder(w).Encode(map[string]any{
+				"id":          "ev",
+				"hangoutLink": "https://meet.google.com/aaa-bbbb-ccc",
+			})
+			return
+		}
+		http.NotFound(w, r)
+	}))
+	defer srv.Close()
+
+	svc := newCalendarServiceFromServer(t, srv)
+	newCalendarService = func(context.Context, string) (*calendar.Service, error) { return svc, nil }
+
+	ctx := newCalendarJSONOutputContext(t, os.Stdout, os.Stderr)
+
+	cmd := &CalendarUpdateCmd{}
+	if err := runKong(t, cmd, []string{
+		"cal@example.com",
+		"ev",
+		"--with-meet",
+	}, ctx, &RootFlags{Account: "a@b.com"}); err != nil {
+		t.Fatalf("runKong: %v", err)
+	}
+	if !sawConferenceData {
+		t.Fatalf("expected conferenceData create request in patch body")
+	}
+	if !sawVersion {
+		t.Fatalf("expected conferenceDataVersion=1 on patch request")
+	}
+}
+
 func TestCalendarUpdateCmd_AddAttendee(t *testing.T) {
 	origNew := newCalendarService
 	t.Cleanup(func() { newCalendarService = origNew })
diff --git a/internal/cmd/calendar_edit.go b/internal/cmd/calendar_edit.go
index d78fda9..a7f162b 100644
--- a/internal/cmd/calendar_edit.go
+++ b/internal/cmd/calendar_edit.go
@@ -221,6 +221,7 @@ type CalendarUpdateCmd struct {
 	GuestsCanInviteOthers *bool    `name:"guests-can-invite" help:"Allow guests to invite others"`
 	GuestsCanModify       *bool    `name:"guests-can-modify" help:"Allow guests to modify event"`
 	GuestsCanSeeOthers    *bool    `name:"guests-can-see-others" help:"Allow guests to see other guests"`
+	WithMeet              bool     `name:"with-meet" help:"Create a Google Meet video conference for this event"`
 	Scope                 string   `name:"scope" help:"For recurring events: single, future, all" default:"all"`
 	OriginalStartTime     string   `name:"original-start" help:"Original start time of instance (required for scope=single,future)"`
 	PrivateProps          []string `name:"private-prop" help:"Private extended property (key=value, can be repeated)"`
@@ -296,6 +297,7 @@ func (c *CalendarUpdateCmd) Run(ctx context.Context, kctx *kong.Context, flags *
 		"add_attendee":         strings.TrimSpace(c.AddAttendee),
 		"patch":                patch,
 		"wants_add_attendee":   wantsAddAttendee,
+		"conference_version_1": patch.ConferenceData != nil,
 		"supports_attachments": len(patch.Attachments) > 0,
 	}); dryRunErr != nil {
 		return dryRunErr
@@ -393,6 +395,10 @@ func (c *CalendarUpdateCmd) buildUpdatePatch(kctx *kong.Context) (*calendar.Even
 		changed = true
 	}
 
+	if c.applyConferenceData(kctx, patch) {
+		changed = true
+	}
+
 	if c.applyExtendedProperties(kctx, patch) {
 		changed = true
 	}
@@ -650,6 +656,14 @@ func (c *CalendarUpdateCmd) applyGuestOptions(kctx *kong.Context, patch *calenda
 	return changed
 }
 
+func (c *CalendarUpdateCmd) applyConferenceData(kctx *kong.Context, patch *calendar.Event) bool {
+	if !flagProvided(kctx, "with-meet") {
+		return false
+	}
+	patch.ConferenceData = buildConferenceData(true)
+	return true
+}
+
 func (c *CalendarUpdateCmd) applyExtendedProperties(kctx *kong.Context, patch *calendar.Event) bool {
 	if !flagProvided(kctx, "private-prop") && !flagProvided(kctx, "shared-prop") {
 		return false
diff --git a/internal/cmd/calendar_mutation_helpers.go b/internal/cmd/calendar_mutation_helpers.go
index 75947bc..2ca24b1 100644
--- a/internal/cmd/calendar_mutation_helpers.go
+++ b/internal/cmd/calendar_mutation_helpers.go
@@ -57,6 +57,9 @@ func (m *calendarMutationContext) patchEvent(ctx context.Context, eventID string
 	if sendUpdates != "" {
 		call = call.SendUpdates(sendUpdates)
 	}
+	if patch.ConferenceData != nil {
+		call = call.ConferenceDataVersion(1)
+	}
 	return call.Do()
 }