diff --git a/package-lock.json b/package-lock.json
index d0e02eb..b202740 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "korean-business-day",
-  "version": "3.0.0",
+  "version": "3.1.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "korean-business-day",
-      "version": "3.0.0",
+      "version": "3.1.0",
       "license": "MIT",
       "devDependencies": {
         "@croquiscom/eslint-config": "^2.4.0",
diff --git a/package.json b/package.json
index 71d12d4..7af7fa3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "korean-business-day",
-  "version": "3.0.0",
+  "version": "3.1.0",
   "description": "Node module for korean business days",
   "type": "module",
   "main": "./lib/cjs/index.js",