diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 54a1561..47a6651 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -30,8 +30,6 @@ jobs:
           - truffleruby-head
           - mingw
         exclude:
-          - { os: ubuntu,  ruby: jruby }
-          - { os: ubuntu,  ruby: jruby-head }
           - { os: ubuntu,  ruby: mingw }
           - { os: macos,   ruby: mingw }
           - { os: windows, ruby: truffleruby }
@@ -46,8 +44,12 @@ jobs:
         with:
           ruby-version: ${{ matrix.ruby }}
           bundler-cache: true
+        env:
+          JAVA_OPTS: -Djdk.io.File.enableADS=true
       - name: Run tests
         run: bundle exec rake default
+        env:
+          JAVA_OPTS: -Djdk.io.File.enableADS=true
 
   finish:
     runs-on: ubuntu-latest
diff --git a/README.md b/README.md
index 23a4775..dd55971 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,6 @@ An easy way to keep your users' passwords secure.
 * https://github.com/bcrypt-ruby/bcrypt-ruby/tree/master
 
 [![Github Actions Build Status](https://github.com/bcrypt-ruby/bcrypt-ruby/actions/workflows/ruby.yml/badge.svg?branch=master)](https://github.com/bcrypt-ruby/bcrypt-ruby/actions/workflows/ruby.yml)
-[![AppVeyor Build Status](https://ci.appveyor.com/api/projects/status/6fplerx9lnaf0hyo?svg=true)](https://ci.appveyor.com/project/TJSchuck35975/bcrypt-ruby)
 
 ## Why you should use `bcrypt()`
 
diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100644
index e832e22..0000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,50 +0,0 @@
-version: "{branch}-{build}"
-build: off
-clone_depth: 1
-
-init:
-  # Install Ruby head
-  - if %RUBY_VERSION%==head (
-      appveyor DownloadFile https://github.com/oneclick/rubyinstaller2/releases/download/rubyinstaller-head/rubyinstaller-head-x86.exe -FileName C:\head_x86.exe &
-      C:\head_x86.exe /verysilent /dir=C:\Ruby%RUBY_VERSION%
-    )
-  - if %RUBY_VERSION%==head-x64 (
-      appveyor DownloadFile https://github.com/oneclick/rubyinstaller2/releases/download/rubyinstaller-head/rubyinstaller-head-x64.exe -FileName C:\head_x64.exe &
-      C:\head_x64.exe /verysilent /dir=C:\Ruby%RUBY_VERSION%
-    )
-
-  # Add Ruby to the path
-  - set PATH=C:\Ruby%RUBY_VERSION%\bin;%PATH%
-
-environment:
-  matrix:
-    - RUBY_VERSION: "head"
-    - RUBY_VERSION: "head-x64"
-    - RUBY_VERSION: "25"
-    - RUBY_VERSION: "25-x64"
-    - RUBY_VERSION: "24"
-    - RUBY_VERSION: "24-x64"
-    - RUBY_VERSION: "23"
-    - RUBY_VERSION: "23-x64"
-    - RUBY_VERSION: "22"
-    - RUBY_VERSION: "22-x64"
-    - RUBY_VERSION: "21"
-    - RUBY_VERSION: "21-x64"
-    - RUBY_VERSION: "200"
-    - RUBY_VERSION: "200-x64"
-
-install:
-  - ps: "Set-Content -Value 'gem: --no-ri --no-rdoc ' -Path C:\\ProgramData\\gemrc"
-  - if %RUBY_VERSION%==head     ( gem install bundler -v'< 2' )
-  - if %RUBY_VERSION%==head-x64 ( gem install bundler -v'< 2' )
-  - bundle install
-
-before_build:
-  - ruby -v
-  - gem -v
-
-build_script:
-  - bundle exec rake compile -rdevkit
-
-test_script:
-  - bundle exec rake spec
diff --git a/bcrypt.gemspec b/bcrypt.gemspec
index 5971af1..3a4487e 100644
--- a/bcrypt.gemspec
+++ b/bcrypt.gemspec
@@ -12,7 +12,7 @@ Gem::Specification.new do |s|
   s.files = `git ls-files`.split("\n")
   s.require_path = 'lib'
 
-  s.add_development_dependency 'rake-compiler', '~> 0.9.2'
+  s.add_development_dependency 'rake-compiler', '~> 1.2.0'
   s.add_development_dependency 'rspec', '>= 3'
 
   s.rdoc_options += ['--title', 'bcrypt-ruby', '--line-numbers', '--inline-source', '--main', 'README.md']
diff --git a/ext/mri/bcrypt_ext.c b/ext/mri/bcrypt_ext.c
index 6c68504..2366185 100644
--- a/ext/mri/bcrypt_ext.c
+++ b/ext/mri/bcrypt_ext.c
@@ -71,8 +71,6 @@ static void * bc_crypt_nogvl(void * ptr) {
 */
 static VALUE bc_crypt(VALUE self, VALUE key, VALUE setting) {
     char * value;
-    void * data;
-    int size;
     VALUE out;
 
     struct bc_crypt_args args;