diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 6b7b74c..da59f99 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.3.0"
+  ".": "0.4.0"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 759b060..b0e5493 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,17 @@
 # Changelog
 
+## [0.4.0](https://github.com/nzdjb/static-site-generator/compare/v0.3.0...v0.4.0) (2023-03-29)
+
+
+### Features
+
+* Make indexTemplate optional. ([cde30be](https://github.com/nzdjb/static-site-generator/commit/cde30bee11f8e040bfbe4c259ff4132ee82b903e))
+
+
+### Bug Fixes
+
+* Add descriptions for parameters. ([41cdc4d](https://github.com/nzdjb/static-site-generator/commit/41cdc4d9a7b483354cece486ecd50a58d9d7d444))
+
 ## [0.3.0](https://github.com/nzdjb/static-site-generator/compare/v0.2.0...v0.3.0) (2023-03-29)
 
 
diff --git a/package.json b/package.json
index 39141f3..f7c8725 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@nzdjb/static-site-generator",
-  "version": "0.3.0",
+  "version": "0.4.0",
   "description": "Static site generator.",
   "main": "dist/src/index.js",
   "repository": "https://github.com/nzdjb/static-site-generator",