diff --git a/Gemfile b/Gemfile
index c437f69..29af0ac 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,10 +2,9 @@ source "https://rubygems.org"
 
 group :development do
   gem "rspec_junit_formatter"
-  gem "rdoc"
 
-  platforms :jruby do
-    gem "rbs", ">= 4.1.0.pre.2" # Use the java-platform gem so JRuby does not build the C extension
+  platforms :ruby do
+    gem "rdoc"
   end
 end
 
diff --git a/Rakefile b/Rakefile
index eb9984a..21f2ba3 100644
--- a/Rakefile
+++ b/Rakefile
@@ -21,12 +21,17 @@ end
 
 task default: :spec
 
-require "rdoc/task"
-Rake::RDocTask.new do |rdoc|
-  version = File.exist?("VERSION") ? File.read("VERSION") : ""
+begin
+  require "rdoc/task"
+rescue LoadError
+  # The Gemfile bundles rdoc only on platforms :ruby; skip the RDoc task without it
+else
+  Rake::RDocTask.new do |rdoc|
+    version = File.exist?("VERSION") ? File.read("VERSION") : ""
 
-  rdoc.rdoc_dir = "doc"
-  rdoc.title = "ruby-plsql #{version}"
-  rdoc.rdoc_files.include("README*")
-  rdoc.rdoc_files.include("lib/**/*.rb")
+    rdoc.rdoc_dir = "doc"
+    rdoc.title = "ruby-plsql #{version}"
+    rdoc.rdoc_files.include("README*")
+    rdoc.rdoc_files.include("lib/**/*.rb")
+  end
 end