diff --git a/bin/update_ics_year.sh b/bin/update_ics_year.sh
new file mode 100755
index 0000000..dacca09
--- /dev/null
+++ b/bin/update_ics_year.sh
@@ -0,0 +1,43 @@
+#!/bin/bash
+
+basename=$(basename $0)
+
+if [ "$1" ]
+then
+    year=$2
+    next_year=$(($year+1))
+    result_file=${1/.ics/}_update_year.ics
+    mid_file="mid.ics"
+    calendar_end=$(tail -n 1 $1)
+
+    # カレンダ定義のためのoffsetを最初に確保
+    calendar_offset=$(($(grep BEGIN:VEVENT -n $1 | sed -e 's/:.*//g' | head -n 1)-1)) #最初のBEGIN:VEVENTを含まないようにするため
+    sed -n "1, ${calendar_offset}p" $1 > $result_file
+    sed "1, ${calendar_offset}d" $1 > $mid_file
+
+    # dtstart:yyyyを含むイベントを抽出
+    i=$(grep DTSTART:$year $mid_file | head -n 1)
+    while [ "$i" ]
+    do
+        event_start=$(($(grep DTSTART:${year} -n $mid_file | sed -e 's/:.*//g' | head -n 1)-1)) # 最初のDTSTARTと，BEGIN:VEVENTを追加するため
+        event_end=$(($(tail -n +$event_start $mid_file | grep END:VEVENT -n  | sed -e 's/:.*//g' | head -n 1)+$event_start-1)) # 次のBEGIN:VEVENTを含まないようにするため，-1
+        sed -n "${event_start}, ${event_end}p" $mid_file >> $result_file
+        tmp=$(sed "1, ${event_end}d" $mid_file)
+        echo "$tmp" > "$mid_file"
+        i=$(grep DTSTART:$year $mid_file | head -n 1)
+    done
+
+    # yearをnext_yearに置換
+    result=$(sed "s/$year/$next_year/g" $result_file)
+    echo "$result" > "$result_file"
+
+    # 終了処理
+    echo "$calendar_end" >> $result_file
+    rm $mid_file
+
+else
+    echo "Usage: bash $basename <filename> yyyy"
+    echo "<filename> shoule be filename for ics file."
+    echo "If you exec this script, '<filename>_update_year.ics' is generated."
+    echo "This file include script result."
+fi