diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 2edaa13..2e55bbd 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,5 +1,5 @@
 {
-  "packages/saju": "1.3.0",
+  "packages/saju": "1.3.1",
   "packages/validate-branch": "1.1.3",
   "packages/create-fullstack-starter": "0.2.5",
   "packages/saju-dart": "0.1.3",
diff --git a/packages/saju/CHANGELOG.md b/packages/saju/CHANGELOG.md
index eb240ca..c68d0d0 100644
--- a/packages/saju/CHANGELOG.md
+++ b/packages/saju/CHANGELOG.md
@@ -1,5 +1,12 @@
 # @gracefullight/saju
 
+## [1.3.1](https://github.com/gracefullight/pkgs/compare/@gracefullight/saju@1.3.0...@gracefullight/saju@1.3.1) (2026-04-10)
+
+
+### Bug Fixes
+
+* **saju:** support plain Date in date-fns adapter ([f802017](https://github.com/gracefullight/pkgs/commit/f8020174659f26f373b7024b436ae868aa700c9b))
+
 ## [1.3.0](https://github.com/gracefullight/pkgs/compare/@gracefullight/saju@1.2.0...@gracefullight/saju@1.3.0) (2026-02-21)
 
 
diff --git a/packages/saju/package.json b/packages/saju/package.json
index bda8762..4f1b55d 100644
--- a/packages/saju/package.json
+++ b/packages/saju/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@gracefullight/saju",
-  "version": "1.3.0",
+  "version": "1.3.1",
   "description": "Four Pillars (四柱) calculator with flexible date adapter support",
   "type": "module",
   "main": "./dist/index.js",