diff --git a/src/Ulid.Unity/Assets/Scripts/Ulid/package.json b/src/Ulid.Unity/Assets/Scripts/Ulid/package.json
index 3327642..8d85694 100644
--- a/src/Ulid.Unity/Assets/Scripts/Ulid/package.json
+++ b/src/Ulid.Unity/Assets/Scripts/Ulid/package.json
@@ -1,7 +1,7 @@
 {
   "name": "com.cysharp.ulid",
   "displayName": "Ulid",
-  "version": "1.3.0",
+  "version": "1.3.1",
   "unity": "2019.4",
   "description": "Fast .NET C# Implementation of ULID for .NET Core and Unity.",
   "keywords": [