diff --git a/evolution-year-view-week-number.patch b/evolution-year-view-week-number.patch
new file mode 100644
index 0000000..edd41b8
--- /dev/null
+++ b/evolution-year-view-week-number.patch
@@ -0,0 +1,53 @@
+From 4af3f6833b252f713fe19a531008d6451064701b Mon Sep 17 00:00:00 2001
+From: Milan Crha <mcrha@redhat.com>
+Date: Wed, 4 Feb 2026 08:35:22 +0100
+Subject: [PATCH] I#3238 - Calendar: Year view shows incorrect week number
+
+Closes https://gitlab.gnome.org/GNOME/evolution/-/issues/3238
+---
+ src/e-util/e-month-widget.c | 16 +++-------------
+ 1 file changed, 3 insertions(+), 13 deletions(-)
+
+diff --git a/src/e-util/e-month-widget.c b/src/e-util/e-month-widget.c
+index ed8ecf6b8f..12d765c2e1 100644
+--- a/src/e-util/e-month-widget.c
++++ b/src/e-util/e-month-widget.c
+@@ -161,32 +161,22 @@ e_month_widget_update (EMonthWidget *self)
+ 	GDate *date, tmp_date;
+ 	GtkWidget *widget;
+ 	gchar buffer[128];
+-	guint week_of_year, week_of_last_year = 0;
+ 	guint ii, jj, month_day, max_month_days;
+ 
+ 	if (!digit_format)
+ 		digit_format = get_digit_format ();
+ 
+ 	date = g_date_new_dmy (1, self->priv->month, self->priv->year);
+-
+-	if (self->priv->week_start_day == G_DATE_SUNDAY) {
+-		week_of_year = g_date_get_sunday_week_of_year (date);
+-		if (!week_of_year)
+-			week_of_last_year = g_date_get_sunday_weeks_in_year (self->priv->year - 1);
+-	} else {
+-		week_of_year = g_date_get_monday_week_of_year (date);
+-		if (!week_of_year)
+-			week_of_last_year = g_date_get_monday_weeks_in_year (self->priv->year - 1);
+-	}
++	tmp_date = *date;
+ 
+ 	/* Update week numbers */
+ 	for (ii = 0; ii < MAX_WEEKS; ii++) {
+-		g_snprintf (buffer, sizeof (buffer), digit_format, !week_of_year ? week_of_last_year : week_of_year);
++		g_snprintf (buffer, sizeof (buffer), digit_format, g_date_get_iso8601_week_of_year (&tmp_date));
+ 
+ 		widget = gtk_grid_get_child_at (self->priv->grid, 0, ii + 1);
+ 		gtk_label_set_text (GTK_LABEL (widget), buffer);
+ 
+-		week_of_year++;
++		g_date_add_days (&tmp_date, 7);
+ 	}
+ 
+ 	/* Update day names */
+-- 
+2.52.0
+
diff --git a/evolution.changes b/evolution.changes
index ac47eea..38cfd01 100644
--- a/evolution.changes
+++ b/evolution.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Wed Feb  4 14:46:58 UTC 2026 - Michael Gorse <mgorse@suse.com>
+
+- Add evolution-year-view-week-number.patch: fix incorrect week
+  numbers in calendar year view (bsc#1256465
+  glgo#GNOME/evolution#3238).
+
 -------------------------------------------------------------------
 Tue Oct 28 19:40:36 UTC 2025 - Michael Gorse <mgorse@suse.com>
 
diff --git a/evolution.spec b/evolution.spec
index 8c994ca..831e877 100644
--- a/evolution.spec
+++ b/evolution.spec
@@ -33,6 +33,8 @@ Source0:        %{name}-%{version}.tar.zst
 Patch0:         evolution-fix-gtk-call-from-other-thread.patch
 # PATCH-FIX-UPSTREAM evolution-fix-javascript-code.patch bsc#1252722 mgorse@suse.com -- fix JavaScript dictionary objects creation.
 Patch1:         evolution-fix-javascript-code.patch
+# PATCH-FIX-UPSTREAM evolution-year-view-week-number.patch bsc#1256465 mgorse@suse.com -- fix incorrect week numbers in calendar year view.
+Patch2:         evolution-year-view-week-number.patch
 
 BuildRequires:  bison
 BuildRequires:  bogofilter