diff --git a/Gemfile b/Gemfile
index f98fc3f..1a84b16 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,11 +2,11 @@
 
 source "https://rubygems.org"
 
-gem "jekyll-theme-chirpy", "~> 6.3.1"
+gem "jekyll-theme-chirpy", "~> 6.4", ">= 6.4.2"
 gem 'jekyll-compose', group: [:jekyll_plugins]
 
 group :test do
-  gem "html-proofer", "~> 3.18"
+  gem "html-proofer", "~> 4.4"
 end
 
 # Windows and JRuby does not include zoneinfo files, so bundle the tzinfo-data gem
@@ -22,8 +22,3 @@ gem "wdm", "~> 0.1.1", :platforms => [:mingw, :x64_mingw, :mswin]
 # Lock `http_parser.rb` gem to `v0.6.x` on JRuby builds since newer versions of the gem
 # do not have a Java counterpart.
 gem "http_parser.rb", "~> 0.6.0", :platforms => [:jruby]
-
-# Lock jekyll-sass-converter to 2.x on Linux-musl
-if RUBY_PLATFORM =~ /linux-musl/
-  gem "jekyll-sass-converter", "~> 2.0"
-end