diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6382c03..0e5d5e9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,7 @@ One of the major changes in this version is that a lot of time was spent on reth
 - When `nav-short` is turned on, the avatar will also be shorter
 - Fixed rendering issues with `nav-short` option that caused the body of the page to start too low
 - Improved the `footer-extra` YAML option to support multiple files instead of only a single file
+- Upgraded kramdown to version 2.3.0 to fix security issues
 - Upgraded jQuery to version 3.5.1 to fix a couple security vulnerabilities with the previous version
 - Added automatic navbar color detection (#702)
 - Changed navbar and footer background colour to be slightly darker, for better contrast with the default white page background
diff --git a/beautiful-jekyll-theme.gemspec b/beautiful-jekyll-theme.gemspec
index 7ba516c..78ea56a 100644
--- a/beautiful-jekyll-theme.gemspec
+++ b/beautiful-jekyll-theme.gemspec
@@ -21,6 +21,7 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency "jekyll-paginate", "~> 1.1"
   spec.add_runtime_dependency "jekyll-sitemap", "~> 1.4"
   spec.add_runtime_dependency "kramdown-parser-gfm", "~> 1.1"
+  spec.add_runtime_dependency "kramdown", "~> 2.3.0"
 
   spec.add_development_dependency "bundler", ">= 1.16"
   spec.add_development_dependency "rake", "~> 12.0"