diff --git a/Gemfile b/Gemfile
index 0ee6afe4..a0b743ab 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,7 +12,7 @@ gem "org-ruby", "0.9.12"
 gem "creole", "~>0.5.0"
 gem "wikicloth", "=0.8.3"
 gem "twitter-text", "~> 1.14"
-gem "asciidoctor", "~> 2.0.5"
+gem "asciidoctor", "~> 2.0.26"
 gem "rake"
 gem "rexml"
 gem "nokogiri", ">= 1.19.1"
diff --git a/Gemfile.lock b/Gemfile.lock
index ddc85550..11179691 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -28,12 +28,12 @@ GEM
       mutex_m
       securerandom (>= 0.3)
       tzinfo (~> 2.0)
-    asciidoctor (2.0.23)
+    asciidoctor (2.0.26)
     base64 (0.2.0)
     benchmark (0.4.0)
     bigdecimal (3.1.9)
     builder (3.3.0)
-    cgi (0.4.2)
+    cgi (0.5.1)
     charlock_holmes (0.7.9)
     concurrent-ruby (1.3.5)
     connection_pool (2.5.0)
@@ -42,7 +42,7 @@ GEM
     date (3.4.1)
     drb (2.2.1)
     expression_parser (0.9.0)
-    github-linguist (9.1.0)
+    github-linguist (9.3.0)
       cgi
       charlock_holmes (~> 0.7.7)
       mini_mime (~> 1.0)
@@ -80,11 +80,11 @@ GEM
       date
       stringio
     racc (1.8.1)
-    rake (13.2.1)
+    rake (13.3.1)
     rdoc (6.13.1)
       psych (>= 4.0.0)
     redcarpet (3.6.1)
-    rexml (3.4.2)
+    rexml (3.4.4)
     ruby-enum (0.9.0)
       i18n
     rubypants (0.7.1)
@@ -120,7 +120,7 @@ PLATFORMS
 DEPENDENCIES
   RedCloth
   activesupport (~> 7.1.5)
-  asciidoctor (~> 2.0.5)
+  asciidoctor (~> 2.0.26)
   commonmarker!
   creole (~> 0.5.0)
   github-linguist (>= 7.1.3)
diff --git a/github-markup.gemspec b/github-markup.gemspec
index 4329a901..70b0375c 100644
--- a/github-markup.gemspec
+++ b/github-markup.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |s|
   s.test_files    = s.files.grep(%r{^(test|spec|features)/})
   s.require_paths = %w[lib]
 
-  s.add_development_dependency 'rake', '~> 12'
+  s.add_development_dependency 'rake', '~> 13'
   s.add_development_dependency 'activesupport', '~> 7.1.5'
   s.add_development_dependency 'minitest', '~> 5.4', '>= 5.4.3'
   s.add_development_dependency 'html-pipeline', '~> 1.0'