diff --git a/data/sketch/functions/core/load.mcfunction b/data/sketch/functions/core/load.mcfunction
index be80586..f8875d3 100644
--- a/data/sketch/functions/core/load.mcfunction
+++ b/data/sketch/functions/core/load.mcfunction
@@ -4,5 +4,14 @@
 #
 # @within tag/function minecraft:load
 
-# 初回ロード時実行
-    execute unless data storage sketch: {Version:"2.0.0"} run function sketch:core/load_once
+# バージョン初期化
+    execute unless data storage sketch: Version run data modify storage sketch: Version set value "1.0.0"
+
+# マイグレーション
+## 1.0.x
+    execute if data storage sketch: {Version:"1.0.0"} run function sketch:core/migration/1.0.1/_
+
+## 2.0.x
+    execute if data storage sketch: {Version:"1.0.1"} run function sketch:core/migration/2.0.0/_
+    execute if data storage sketch: {Version:"2.0.0"} run function sketch:core/migration/2.0.1/_
+    execute if data storage sketch: {Version:"2.0.1"} run function sketch:core/migration/2.0.2/_
diff --git a/data/sketch/functions/core/migration/1.0.1/_.mcfunction b/data/sketch/functions/core/migration/1.0.1/_.mcfunction
new file mode 100644
index 0000000..2af471f
--- /dev/null
+++ b/data/sketch/functions/core/migration/1.0.1/_.mcfunction
@@ -0,0 +1,5 @@
+#> sketch:core/migration/1.0.1/_
+# @within function sketch:core/load
+
+# バージョン設定
+    data modify storage sketch: Version set value "1.0.1"
diff --git a/data/sketch/functions/core/load_once.mcfunction b/data/sketch/functions/core/migration/2.0.0/_.mcfunction
similarity index 89%
rename from data/sketch/functions/core/load_once.mcfunction
rename to data/sketch/functions/core/migration/2.0.0/_.mcfunction
index 3c80b6b..24325d8 100644
--- a/data/sketch/functions/core/load_once.mcfunction
+++ b/data/sketch/functions/core/migration/2.0.0/_.mcfunction
@@ -1,7 +1,4 @@
-#> sketch:core/load_once
-#
-# 初回ロード時に実行される
-#
+#> sketch:core/migration/2.0.0/_
 # @within function sketch:core/load
 
 # バージョン設定
@@ -11,7 +8,6 @@
 # ストレージ設定
     data modify storage sketch:core GlobalItemInfoMap set value []
 
-
 # スコアボード設定
     scoreboard objectives add Sketch dummy
     scoreboard objectives add Sketch.Id dummy
diff --git a/data/sketch/functions/core/migration/2.0.1/_.mcfunction b/data/sketch/functions/core/migration/2.0.1/_.mcfunction
new file mode 100644
index 0000000..f598962
--- /dev/null
+++ b/data/sketch/functions/core/migration/2.0.1/_.mcfunction
@@ -0,0 +1,5 @@
+#> sketch:core/migration/2.0.1/_
+# @within function sketch:core/load
+
+# バージョン設定
+    data modify storage sketch: Version set value "2.0.1"
diff --git a/data/sketch/functions/core/migration/2.0.2/_.mcfunction b/data/sketch/functions/core/migration/2.0.2/_.mcfunction
new file mode 100644
index 0000000..039b8b7
--- /dev/null
+++ b/data/sketch/functions/core/migration/2.0.2/_.mcfunction
@@ -0,0 +1,8 @@
+#> sketch:core/migration/2.0.2/_
+# @within function sketch:core/load
+
+# バージョン設定
+    data modify storage sketch: Version set value "2.0.2"
+
+# sketch:util/map/delete の引数が消去されない問題を修正 (#8)
+    data remove storage sketch:util in
diff --git a/pack.mcmeta b/pack.mcmeta
index b0f37a7..55d8721 100644
--- a/pack.mcmeta
+++ b/pack.mcmeta
@@ -1,6 +1,6 @@
 {
     "pack": {
         "pack_format": 12,
-        "description": "Sketch 2.0.0"
+        "description": "Sketch 2.0.2"
     }
 }