diff --git a/.ruby-version b/.ruby-version
index e4604e3af..7919852fe 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.2.1
+4.0.9
diff --git a/Gemfile b/Gemfile
index 6a09ba724..89abc0cb0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,4 +2,4 @@
 
 source 'https://rubygems.org'
 
-gem 'html-proofer', "~> 5.2.0", :require => false
+gem 'html-proofer', "~> 5.2.3", :require => false