diff --git a/pkgs/tools/typesetting/asciidoctor-with-extensions/Gemfile b/pkgs/tools/typesetting/asciidoctor-with-extensions/Gemfile
index feb1437d6d40..3675775e1688 100644
--- a/pkgs/tools/typesetting/asciidoctor-with-extensions/Gemfile
+++ b/pkgs/tools/typesetting/asciidoctor-with-extensions/Gemfile
@@ -1,10 +1,11 @@
 source 'https://rubygems.org'
 gem 'asciidoctor'
-gem 'asciidoctor-diagram'
-gem 'asciidoctor-pdf'
-gem 'asciidoctor-epub3'
-gem 'asciidoctor-mathematical'
 gem 'asciidoctor-bibtex'
+gem 'asciidoctor-diagram'
+gem 'asciidoctor-epub3'
+gem 'asciidoctor-html5s'
+gem 'asciidoctor-mathematical'
+gem 'asciidoctor-pdf'
 gem 'asciidoctor-revealjs'
 gem 'coderay'
 gem 'pygments.rb'
diff --git a/pkgs/tools/typesetting/asciidoctor-with-extensions/Gemfile.lock b/pkgs/tools/typesetting/asciidoctor-with-extensions/Gemfile.lock
index 14829ed7b0a6..eba0e0d1f9fe 100644
--- a/pkgs/tools/typesetting/asciidoctor-with-extensions/Gemfile.lock
+++ b/pkgs/tools/typesetting/asciidoctor-with-extensions/Gemfile.lock
@@ -23,6 +23,9 @@ GEM
       asciidoctor (>= 1.5.6, < 3.0.0)
       gepub (~> 1.0.0)
       mime-types (~> 3.0)
+    asciidoctor-html5s (0.5.1)
+      asciidoctor (>= 1.5.7, < 3.0)
+      thread_safe (~> 0.3.4)
     asciidoctor-mathematical (0.3.5)
       asciidoctor (~> 2.0)
       asciimath (~> 2.0)
@@ -120,6 +123,7 @@ DEPENDENCIES
   asciidoctor-bibtex
   asciidoctor-diagram
   asciidoctor-epub3
+  asciidoctor-html5s
   asciidoctor-mathematical
   asciidoctor-pdf
   asciidoctor-revealjs
diff --git a/pkgs/tools/typesetting/asciidoctor-with-extensions/gemset.nix b/pkgs/tools/typesetting/asciidoctor-with-extensions/gemset.nix
index 6bd49e099623..72421655f695 100644
--- a/pkgs/tools/typesetting/asciidoctor-with-extensions/gemset.nix
+++ b/pkgs/tools/typesetting/asciidoctor-with-extensions/gemset.nix
@@ -93,6 +93,17 @@
     };
     version = "1.5.1";
   };
+  asciidoctor-html5s = {
+    dependencies = ["asciidoctor" "thread_safe"];
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "1zfbfcqyrsk8bnd526ang3b4j3m5pbns7x3fdxarrm8vv1qplss1";
+      type = "gem";
+    };
+    version = "0.5.1";
+  };
   asciidoctor-mathematical = {
     dependencies = ["asciidoctor" "asciimath" "mathematical"];
     groups = ["default"];