diff --git a/benchmarks/activerecord/Gemfile b/benchmarks/activerecord/Gemfile
index ed3c30bc..b7e948bb 100644
--- a/benchmarks/activerecord/Gemfile
+++ b/benchmarks/activerecord/Gemfile
@@ -1,6 +1,6 @@
 source "https://rubygems.org"
 gem "activerecord", "~> 8.0"
-gem "sqlite3", platform: :ruby
+gem "sqlite3", platforms: [:ruby, :windows]
 gem "activerecord-jdbc-adapter", github: "k0kubun/activerecord-jdbc-adapter", ref: "rails-8.1-sqlite3", platform: :jruby
 gem "activerecord-jdbcsqlite3-adapter", github: "k0kubun/activerecord-jdbc-adapter", ref: "rails-8.1-sqlite3", platform: :jruby
 gem "mutex_m"
diff --git a/benchmarks/gvl_release_acquire/benchmark.rb b/benchmarks/gvl_release_acquire/benchmark.rb
index bf8ad256..e735bfe2 100644
--- a/benchmarks/gvl_release_acquire/benchmark.rb
+++ b/benchmarks/gvl_release_acquire/benchmark.rb
@@ -1,8 +1,20 @@
 require_relative "../../harness/loader"
 
+# Windows has no /dev/zero, so read the same zeros from a regular file kept in data/.
+ZERO_PATH = if File.exist?("/dev/zero")
+  "/dev/zero"
+else
+  File.join(__dir__, "data", "zero").tap do |path|
+    unless File.size?(path) == 1_000_000
+      Dir.mkdir(File.dirname(path)) unless Dir.exist?(File.dirname(path))
+      File.binwrite(path, "\0" * 1_000_000)
+    end
+  end
+end.freeze
+
 run_benchmark(5) do |num_rs, ractor_args|
   output = File.open(File::NULL, "wb")
-  input = File.open("/dev/zero", "rb")
+  input = File.open(ZERO_PATH, "rb")
   100_000.times do
     output.write(input.read(10))
   end
diff --git a/benchmarks/lobsters/Gemfile b/benchmarks/lobsters/Gemfile
index 4ec6fe53..33eac9fa 100644
--- a/benchmarks/lobsters/Gemfile
+++ b/benchmarks/lobsters/Gemfile
@@ -11,6 +11,9 @@ gem "cgi" # Workaround cgi extraction in Ruby 3.5.0-dev
   gem rails_gem, "~> 8.0"
 end
 
+# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
+gem "tzinfo-data", platforms: [:windows, :jruby]
+
 gem "sqlite3"
 #gem "mysql2"
 
diff --git a/benchmarks/lobsters/Gemfile.lock b/benchmarks/lobsters/Gemfile.lock
index f9456dfc..10e798c2 100644
--- a/benchmarks/lobsters/Gemfile.lock
+++ b/benchmarks/lobsters/Gemfile.lock
@@ -372,6 +372,7 @@ DEPENDENCIES
   sqlite3
   stackprof
   svg-graph
+  tzinfo-data
   vcr
   webmock
 
diff --git a/benchmarks/railsbench/Gemfile b/benchmarks/railsbench/Gemfile
index 9e0756aa..3e104614 100644
--- a/benchmarks/railsbench/Gemfile
+++ b/benchmarks/railsbench/Gemfile
@@ -20,7 +20,7 @@ gem 'sprockets-rails', '3.2.2'
 
 gem 'stackprof', platforms: :mri
 # Use sqlite3 as the database for Active Record
-gem 'sqlite3', platform: :ruby
+gem 'sqlite3', platforms: [:ruby, :windows]
 gem 'activerecord-jdbc-adapter', github: 'k0kubun/activerecord-jdbc-adapter', ref: 'rails-8.1-sqlite3', platform: :jruby
 gem 'activerecord-jdbcsqlite3-adapter', github: 'k0kubun/activerecord-jdbc-adapter', ref: 'rails-8.1-sqlite3', platform: :jruby
 # Use webrick for the web server since it's easy to install.
diff --git a/benchmarks/rubyboy/benchmark.rb b/benchmarks/rubyboy/benchmark.rb
index 54b0d5e1..5a086fc2 100644
--- a/benchmarks/rubyboy/benchmark.rb
+++ b/benchmarks/rubyboy/benchmark.rb
@@ -13,6 +13,16 @@
 # The rom is included in the gem in a sibling directory to the rubyboy code.
 ROM_PATH = File.expand_path("../../roms/tobu.gb", $".detect { |x| x.end_with?("/rubyboy/emulator_headless.rb") }).freeze
 
+# Rubyboy opens the ROM with mode "r", which converts CRLF to LF on Windows.
+if Gem.win_platform?
+  File.singleton_class.prepend(Module.new do
+    def open(path, *args, **kwargs, &block)
+      args[0] = "rb" if path == ROM_PATH && args[0] == "r"
+      super(path, *args, **kwargs, &block)
+    end
+  end)
+end
+
 # A count of 500 produces results similar to our optcarrot benchmark.
 # It's possible there is a number that produces a consistent benchmark without
 # needing to re-initialize but not sure how to determine that.
diff --git a/benchmarks/sequel/Gemfile b/benchmarks/sequel/Gemfile
index f0a7806b..90838ed8 100644
--- a/benchmarks/sequel/Gemfile
+++ b/benchmarks/sequel/Gemfile
@@ -1,6 +1,6 @@
 source "https://rubygems.org"
 gem "sequel", "~> 5.63"
-gem "sqlite3", "~> 1.4", platform: :ruby
+gem "sqlite3", "~> 1.4", platforms: [:ruby, :windows]
 gem "jdbc-sqlite3", "~> 3.32.3", platform: :jruby
 
 gem "bigdecimal"
diff --git a/benchmarks/shipit/benchmark.rb b/benchmarks/shipit/benchmark.rb
index 54e51dfa..d7b2ce7d 100644
--- a/benchmarks/shipit/benchmark.rb
+++ b/benchmarks/shipit/benchmark.rb
@@ -11,6 +11,9 @@
 require 'securerandom'
 ENV['SECRET_KEY_BASE'] = SecureRandom.hex(128)
 
+# shipit-engine requires pty, which Windows lacks, only to run deploy commands that the benchmark never starts.
+$LOADED_FEATURES << File.join(RbConfig::CONFIG["archdir"], "pty.so") if Gem.win_platform?
+
 require_relative 'config/environment'
 require_relative "route_generator"