diff --git a/asciidoctor-foodogsquared-extensions.gemspec b/asciidoctor-foodogsquared-extensions.gemspec
index e4befef..5f18d65 100644
--- a/asciidoctor-foodogsquared-extensions.gemspec
+++ b/asciidoctor-foodogsquared-extensions.gemspec
@@ -16,4 +16,5 @@ Gem::Specification.new do |s|
   s.files         = Dir['lib/**/*', '*.gemspec']
 
   s.add_runtime_dependency 'asciidoctor', '~> 2.0'
+  s.add_runtime_dependency 'open-uri-cached', '~> 1.0'
 end
diff --git a/lib/asciidoctor/github-raw-content-include-processor/extension.rb b/lib/asciidoctor/github-raw-content-include-processor/extension.rb
index 20bdda8..06ab142 100644
--- a/lib/asciidoctor/github-raw-content-include-processor/extension.rb
+++ b/lib/asciidoctor/github-raw-content-include-processor/extension.rb
@@ -3,6 +3,7 @@
 require 'base64'
 require 'json'
 require 'open-uri'
+require 'open-uri/cached'
 require 'uri'
 
 class GitHubRawIncludeProcessor < Asciidoctor::Extensions::IncludeProcessor
diff --git a/lib/asciidoctor/gitlab-raw-content-include-processor/extension.rb b/lib/asciidoctor/gitlab-raw-content-include-processor/extension.rb
index 770fded..7d9ac36 100644
--- a/lib/asciidoctor/gitlab-raw-content-include-processor/extension.rb
+++ b/lib/asciidoctor/gitlab-raw-content-include-processor/extension.rb
@@ -3,6 +3,7 @@
 require 'base64'
 require 'json'
 require 'open-uri'
+require 'open-uri/cached'
 require 'uri'
 
 class GitLabRawIncludeProcessor < Asciidoctor::Extensions::IncludeProcessor
diff --git a/lib/asciidoctor/swhid-include-processor/extension.rb b/lib/asciidoctor/swhid-include-processor/extension.rb
index b56d8f2..1bdeca4 100644
--- a/lib/asciidoctor/swhid-include-processor/extension.rb
+++ b/lib/asciidoctor/swhid-include-processor/extension.rb
@@ -2,6 +2,7 @@
 
 require 'json'
 require 'open-uri'
+require 'open-uri/cached'
 require 'uri'
 
 class SWHIDIncludeProcessor < Asciidoctor::Extensions::IncludeProcessor