diff --git a/package-lock.json b/package-lock.json
index 9b43fd0..7b81b76 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@toei-jp/report-domain",
-  "version": "1.0.0",
+  "version": "0.0.1-alpha.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index f143469..2313370 100644
--- a/package.json
+++ b/package.json
@@ -77,5 +77,5 @@
     "postversion": "git push origin --tags",
     "prepublishOnly": "npm run clean && npm run build && npm test && npm run doc"
   },
-  "version": "1.0.0"
+  "version": "0.0.1-alpha.1"
 }