diff --git a/lib/sidekiq.rb b/lib/sidekiq.rb
index 5082bc29..a890355d 100644
--- a/lib/sidekiq.rb
+++ b/lib/sidekiq.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 require "sidekiq/version"
-fail "Sidekiq #{Sidekiq::VERSION} does not support Ruby versions below 2.5.0." if RUBY_PLATFORM != "java" && Gem::Version.new(RUBY_VERSION) < Gem::Version.new("2.5.0")
+fail "Sidekiq #{Sidekiq::VERSION} does not support Ruby versions below 2.7.0." if RUBY_PLATFORM != "java" && Gem::Version.new(RUBY_VERSION) < Gem::Version.new("2.7.0")
 
 require "sidekiq/logger"
 require "sidekiq/client"
diff --git a/lib/sidekiq/cli.rb b/lib/sidekiq/cli.rb
index 00a2d05e..b711156c 100644
--- a/lib/sidekiq/cli.rb
+++ b/lib/sidekiq/cli.rb
@@ -266,7 +266,7 @@ module Sidekiq
 
       if File.directory?(options[:require])
         require "rails"
-        if ::Rails::VERSION::MAJOR < 5
+        if ::Rails::VERSION::MAJOR < 6
           raise "Sidekiq no longer supports this version of Rails"
         else
           require "sidekiq/rails"
diff --git a/sidekiq.gemspec b/sidekiq.gemspec
index e3d5bf76..c0db9ac7 100644
--- a/sidekiq.gemspec
+++ b/sidekiq.gemspec
@@ -12,7 +12,7 @@ Gem::Specification.new do |gem|
   gem.files = ["sidekiq.gemspec", "README.md", "Changes.md", "LICENSE"] + `git ls-files | grep -E '^(bin|lib|web)'`.split("\n")
   gem.name = "sidekiq"
   gem.version = Sidekiq::VERSION
-  gem.required_ruby_version = ">= 2.5.0"
+  gem.required_ruby_version = ">= 2.7.0"
 
   gem.metadata = {
     "homepage_uri" => "https://sidekiq.org",
@@ -22,7 +22,7 @@ Gem::Specification.new do |gem|
     "source_code_uri" => "https://github.com/mperham/sidekiq"
   }
 
-  gem.add_dependency "redis", ">= 4.2.0"
-  gem.add_dependency "connection_pool", ">= 2.2.2"
-  gem.add_dependency "rack", "~> 2.0"
+  gem.add_dependency "redis", ">= 4.5.0"
+  gem.add_dependency "connection_pool", ">= 2.2.5"
+  gem.add_dependency "rack", "~> 2.2"
 end