diff --git a/pkgs/tools/typesetting/asciidoctor/Gemfile.lock b/pkgs/tools/typesetting/asciidoctor/Gemfile.lock
index 04f9029e6e5a..59e8fd06ef2d 100644
--- a/pkgs/tools/typesetting/asciidoctor/Gemfile.lock
+++ b/pkgs/tools/typesetting/asciidoctor/Gemfile.lock
@@ -69,7 +69,7 @@ GEM
     public_suffix (3.0.3)
     pygments.rb (1.2.1)
       multi_json (>= 1.0.0)
-    rack (2.0.5)
+    rack (2.0.6)
     ruby-enum (0.7.2)
       i18n
     ruby-rc4 (0.1.5)
@@ -103,4 +103,4 @@ DEPENDENCIES
   pygments.rb
 
 BUNDLED WITH
-   1.14.6
+   1.16.4
diff --git a/pkgs/tools/typesetting/asciidoctor/gemset.nix b/pkgs/tools/typesetting/asciidoctor/gemset.nix
index 8b960fa3d930..034ab174e8a3 100644
--- a/pkgs/tools/typesetting/asciidoctor/gemset.nix
+++ b/pkgs/tools/typesetting/asciidoctor/gemset.nix
@@ -307,14 +307,12 @@
     version = "1.2.1";
   };
   rack = {
-    groups = ["default"];
-    platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "158hbn7rlc3czp2vivvam44dv6vmzz16qrh5dbzhfxbfsgiyrqw1";
+      sha256 = "1pcgv8dv4vkaczzlix8q3j68capwhk420cddzijwqgi2qb4lm1zm";
       type = "gem";
     };
-    version = "2.0.5";
+    version = "2.0.6";
   };
   ruby-enum = {
     dependencies = ["i18n"];