diff --git a/Gemfile b/Gemfile
index cb5937a..1c293bc 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@
 
 source "https://rubygems.org"
 
-gem "jekyll-theme-chirpy", "~> 6.3", ">= 6.3.1"
+gem "jekyll-theme-chirpy", "~> 6.4"
 
 group :test do
   gem "html-proofer", "~> 4.4"
diff --git a/_config.yml b/_config.yml
index d68f3bd..393eefa 100644
--- a/_config.yml
+++ b/_config.yml
@@ -75,6 +75,10 @@ img_cdn:
 # the avatar on sidebar, support local or CORS resources
 avatar:
 
+# The URL of the site-wide social preview image used in SEO `og:image` meta tag.
+# It can be overridden by a customized `page.image` in front matter.
+social_preview_image: # string, local or CORS resources
+
 # boolean type, the global switch for TOC in posts.
 toc: true
 
diff --git a/assets/lib b/assets/lib
index 8285aed..c577249 160000
--- a/assets/lib
+++ b/assets/lib
@@ -1 +1 @@
-Subproject commit 8285aedc1e5bb1d48478efc5d0223aa2ddbf4c26
+Subproject commit c57724981c36d839881f89540d34d205db06a86f