diff --git a/CHANGELOG.md b/CHANGELOG.md
index 98c1909..68c48eb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,14 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+## [5.2.1](https://github.com/cotes2020/jekyll-theme-chirpy/compare/v5.2.0...v5.2.1) (2022-06-17)
+
+
+### Bug Fixes
+
+* exclude CHANGELOG from output ([971fe03](https://github.com/cotes2020/jekyll-theme-chirpy/commit/971fe03ec329ae49e7d60fe3af6101cfbd1acd6c))
+* **PWA:** sometimes update notification is not triggered ([96af729](https://github.com/cotes2020/jekyll-theme-chirpy/commit/96af7291ea5b2c5ed6372e7b6f7725e67c69f1ba))
+
 ## [5.2.0](https://github.com/cotes2020/jekyll-theme-chirpy/compare/v5.1.0...v5.2.0) (2022-06-09)
 
 
diff --git a/_javascript/copyright b/_javascript/copyright
index fb4de71..2241015 100644
--- a/_javascript/copyright
+++ b/_javascript/copyright
@@ -1,5 +1,5 @@
 /*!
- * Chirpy v5.2.0 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * Chirpy v5.2.1 (https://github.com/cotes2020/jekyll-theme-chirpy/)
  * © 2019 Cotes Chung
  * MIT Licensed
  */
diff --git a/_sass/jekyll-theme-chirpy.scss b/_sass/jekyll-theme-chirpy.scss
index 29b6e44..85cbf28 100644
--- a/_sass/jekyll-theme-chirpy.scss
+++ b/_sass/jekyll-theme-chirpy.scss
@@ -1,7 +1,7 @@
 /*!
  * The styles for Jekyll theme Chirpy
  *
- * Chirpy v5.2.0 (https://github.com/cotes2020/jekyll-theme-chirpy)
+ * Chirpy v5.2.1 (https://github.com/cotes2020/jekyll-theme-chirpy)
  * © 2019 Cotes Chung
  * MIT Licensed
  */
diff --git a/assets/js/dist/categories.min.js b/assets/js/dist/categories.min.js
index 8bed3a9..34f42f5 100644
--- a/assets/js/dist/categories.min.js
+++ b/assets/js/dist/categories.min.js
@@ -1,5 +1,5 @@
 /*!
- * Chirpy v5.2.0 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * Chirpy v5.2.1 (https://github.com/cotes2020/jekyll-theme-chirpy/)
  * © 2019 Cotes Chung
  * MIT Licensed
  */
diff --git a/assets/js/dist/commons.min.js b/assets/js/dist/commons.min.js
index bd78fa3..249d2c7 100644
--- a/assets/js/dist/commons.min.js
+++ b/assets/js/dist/commons.min.js
@@ -1,5 +1,5 @@
 /*!
- * Chirpy v5.2.0 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * Chirpy v5.2.1 (https://github.com/cotes2020/jekyll-theme-chirpy/)
  * © 2019 Cotes Chung
  * MIT Licensed
  */
diff --git a/assets/js/dist/home.min.js b/assets/js/dist/home.min.js
index cb2516c..0fa7b91 100644
--- a/assets/js/dist/home.min.js
+++ b/assets/js/dist/home.min.js
@@ -1,5 +1,5 @@
 /*!
- * Chirpy v5.2.0 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * Chirpy v5.2.1 (https://github.com/cotes2020/jekyll-theme-chirpy/)
  * © 2019 Cotes Chung
  * MIT Licensed
  */
diff --git a/assets/js/dist/misc.min.js b/assets/js/dist/misc.min.js
index cb2516c..0fa7b91 100644
--- a/assets/js/dist/misc.min.js
+++ b/assets/js/dist/misc.min.js
@@ -1,5 +1,5 @@
 /*!
- * Chirpy v5.2.0 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * Chirpy v5.2.1 (https://github.com/cotes2020/jekyll-theme-chirpy/)
  * © 2019 Cotes Chung
  * MIT Licensed
  */
diff --git a/assets/js/dist/page.min.js b/assets/js/dist/page.min.js
index 2e817ac..54a9e55 100644
--- a/assets/js/dist/page.min.js
+++ b/assets/js/dist/page.min.js
@@ -1,5 +1,5 @@
 /*!
- * Chirpy v5.2.0 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * Chirpy v5.2.1 (https://github.com/cotes2020/jekyll-theme-chirpy/)
  * © 2019 Cotes Chung
  * MIT Licensed
  */
diff --git a/assets/js/dist/post.min.js b/assets/js/dist/post.min.js
index edd7514..332b0fc 100644
--- a/assets/js/dist/post.min.js
+++ b/assets/js/dist/post.min.js
@@ -1,5 +1,5 @@
 /*!
- * Chirpy v5.2.0 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * Chirpy v5.2.1 (https://github.com/cotes2020/jekyll-theme-chirpy/)
  * © 2019 Cotes Chung
  * MIT Licensed
  */
diff --git a/assets/js/dist/pvreport.min.js b/assets/js/dist/pvreport.min.js
index 157ef40..2506259 100644
--- a/assets/js/dist/pvreport.min.js
+++ b/assets/js/dist/pvreport.min.js
@@ -1,5 +1,5 @@
 /*!
- * Chirpy v5.2.0 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * Chirpy v5.2.1 (https://github.com/cotes2020/jekyll-theme-chirpy/)
  * © 2019 Cotes Chung
  * MIT Licensed
  */
diff --git a/jekyll-theme-chirpy.gemspec b/jekyll-theme-chirpy.gemspec
index 8d972e3..5cfade7 100644
--- a/jekyll-theme-chirpy.gemspec
+++ b/jekyll-theme-chirpy.gemspec
@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |spec|
   spec.name          = "jekyll-theme-chirpy"
-  spec.version       = "5.2.0"
+  spec.version       = "5.2.1"
   spec.authors       = ["Cotes Chung"]
   spec.email         = ["cotes.chung@gmail.com"]
 
diff --git a/package.json b/package.json
index 5a47ed9..ffcb38f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "jekyll-theme-chirpy",
-  "version": "5.2.0",
+  "version": "5.2.1",
   "description": "A minimal, responsive, and powerful Jekyll theme for presenting professional writing.",
   "repository": {
     "type": "git",