diff --git a/Gemfile b/Gemfile
index ab6a5ab0..ec547fc6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,23 +2,23 @@ source "https://rubygems.org"
 
 ruby '2.7.5'
 
-gem 'activesupport'
+gem 'activesupport', '>= 6.1.7.3'
 gem "erector", "~> 0.10.0"
-gem "sinatra", "~> 1.4.0"
-gem "sinatra-contrib", "~> 1.4.0"
-gem "nokogiri"
+gem "sinatra", "~> 2.2.3"
+gem "sinatra-contrib", "~> 2.2.3"
+gem "nokogiri", ">= 1.13.9"
 gem "thin", "1.8.1"
 gem 'rack-codehighlighter'
 gem 'coderay'
 gem "deckrb", "~> 0.5.2"
 gem "sass"
-gem "redcarpet"
+gem "redcarpet", ">= 3.5.1"
 gem "rubyzip"
 gem "i18n", "~> 0.7"
 gem 'font-awesome-sass'
 gem 'bootstrap-sass'
 gem 'jquery-cdn'
-gem 'sprockets'
+gem 'sprockets', '>= 4.2.0'
 gem 'ffi', "1.15.5"
 gem 'backports', "3.23.0"