diff --git a/.rubocop.yml b/.rubocop.yml
index 0d17f42..099cb76 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -37,4 +37,4 @@ Layout/EndAlignment:
   EnforcedStyleAlignWith: variable
 
 Metrics/BlockLength:
-  Max: 55
+  Max: 37
diff --git a/Rakefile b/Rakefile
index d25e1c7..eb45a33 100644
--- a/Rakefile
+++ b/Rakefile
@@ -9,68 +9,17 @@ require 'net/http'
 require_relative 'config/config'
 require_relative 'lib/package'
 require_relative 'lib/download'
+require_relative 'lib/dmd_tools'
 
 task :dmd, [:version] do |_, arguments|
   raise 'Version is not specified.' unless arguments.key? :version
 
-  dub_version = '1.29.0'
+  dub_version = '1.30.0'
   dscanner_version = '0.12.2'
   dcd_version = '0.13.6'
-  tarball_name = "dmd.#{arguments[:version]}.linux.tar.xz"
 
-  uri = URI "http://downloads.dlang.org/releases/2.x/#{arguments[:version]}/#{tarball_name}"
-  checksum = {
-    dmd: download(uri, "slackbuilds/development/dmd/#{tarball_name}").hexdigest
-  }
-
-  package = Package.new 'development/dmd',
-    version: arguments[:version],
-    homepage: 'https://dlang.org'
-
-  write_info package,
-    downloads: [Download.new(uri.to_s, checksum[:dmd])]
-
-  update_slackbuild_version 'development/dmd', package.version
-  commit 'development/dmd', version
-
-  uri = URI "https://codeload.github.com/dlang/tools/tar.gz/v#{package.version}"
-  checksum[:tools] = download_and_deploy uri,
-    "development/d-tools/tools-#{package.version}.tar.gz"
-
-  uri = URI "https://codeload.github.com/dlang/dub/tar.gz/v#{dub_version}"
-  checksum[:dub] = download_and_deploy uri,
-    "development/d-tools/dub-#{dub_version}.tar.gz"
-
-  checksum[:dscanner] = clone 'https://github.com/dlang-community/D-Scanner.git',
-    "development/d-tools/D-Scanner-#{dscanner_version}.tar.xz"
-  checksum[:dcd] = clone 'https://github.com/dlang-community/DCD.git',
-    "development/d-tools/DCD-#{dcd_version}.tar.xz"
-
-  package = Package.new 'development/d-tools',
-    version: arguments[:version],
-    homepage: 'https://dlang.org',
-    requires: ['dmd']
-
-  write_info package,
-    downloads: [
-      Download.new(hosted_sources("/d-tools/dub-#{dub_version}.tar.gz"), checksum[:dub]),
-      Download.new(hosted_sources("/d-tools/tools-#{package.version}.tar.gz"), checksum[:tools]),
-      Download.new(hosted_sources("/d-tools/D-Scanner-#{dscanner_version}.tar.xz"), checksum[:dscanner]),
-      Download.new(hosted_sources("/d-tools/DCD-#{dcd_version}.tar.xz"), checksum[:dcd])
-    ]
-
-  slackbuild_filename = 'slackbuilds/development/d-tools/d-tools.SlackBuild'
-  slackbuild_contents = File.read(slackbuild_filename)
-    .gsub(/^DUB_VERSION=\${DUB_VERSION:-.+/,
-      "DUB_VERSION=${DUB_VERSION:-#{dub_version}}")
-    .gsub(/^DSCANNER_VERSION=\${DSCANNER_VERSION:-.+/,
-      "DSCANNER_VERSION=${DSCANNER_VERSION:-#{dscanner_version}}")
-    .gsub(/^DCD_VERSION=\${DCD_VERSION:-.+/,
-      "DCD_VERSION=${DCD_VERSION:-#{dcd_version}}")
-  File.open(slackbuild_filename, 'w') { |file| file.puts slackbuild_contents }
-
-  update_slackbuild_version 'development/d-tools', package.version
-  commit 'development/d-tools', package.version
+  SlackBuilder::DmdTools.update_dmd arguments[:version]
+  SlackBuilder::DmdTools.update_tools arguments[:version], dub_version, dscanner_version, dcd_version
 end
 
 task :composer, [:version] do |_, arguments|
diff --git a/lib/dmd_tools.rb b/lib/dmd_tools.rb
new file mode 100644
index 0000000..124fbaa
--- /dev/null
+++ b/lib/dmd_tools.rb
@@ -0,0 +1,83 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+# frozen_string_literal: true
+
+require 'rake'
+require_relative 'download'
+
+module SlackBuilder
+  module DmdTools
+    extend Rake::FileUtilsExt
+
+    def self.update_dmd(version)
+      tarball_name = "dmd.#{version}.linux.tar.xz"
+
+      uri = URI "http://downloads.dlang.org/releases/2.x/#{version}/#{tarball_name}"
+      checksum = download(uri, "slackbuilds/development/dmd/#{tarball_name}")
+
+      package = Package.new 'development/dmd', version: version,
+        homepage: 'https://dlang.org'
+
+      write_info package, downloads: [Download.new(uri.to_s, checksum.hexdigest)]
+
+      update_slackbuild_version 'development/dmd', package.version
+      commit 'development/dmd', version
+    end
+
+    def self.update_tools(version, dub_version, dscanner_version, dcd_version)
+      checksum = collect_checksums(version, dub_version, dscanner_version, dcd_version)
+
+      package = Package.new 'development/d-tools',
+        version: version,
+        homepage: 'https://dlang.org',
+        requires: ['dmd']
+
+      write_tools_info package, dub_version, dscanner_version, dcd_version, checksum
+      update_tools_versions dub_version, dscanner_version, dcd_version
+
+      update_slackbuild_version 'development/d-tools', package.version
+      commit 'development/d-tools', package.version
+    end
+
+    private_class_method def self.write_tools_info(package, dub_version, dscanner_version, dcd_version, checksum)
+      write_info package,
+        downloads: [
+          Download.new(hosted_sources("/d-tools/dub-#{dub_version}.tar.gz"), checksum[:dub]),
+          Download.new(hosted_sources("/d-tools/tools-#{package.version}.tar.gz"), checksum[:tools]),
+          Download.new(hosted_sources("/d-tools/D-Scanner-#{dscanner_version}.tar.xz"), checksum[:dscanner]),
+          Download.new(hosted_sources("/d-tools/DCD-#{dcd_version}.tar.xz"), checksum[:dcd])
+        ]
+    end
+
+    private_class_method def self.collect_checksums(version, dub_version, dscanner_version, dcd_version)
+      checksum = {}
+
+      uri = URI "https://codeload.github.com/dlang/tools/tar.gz/v#{version}"
+      checksum[:tools] = download_and_deploy uri, "development/d-tools/tools-#{version}.tar.gz"
+
+      uri = URI "https://codeload.github.com/dlang/dub/tar.gz/v#{dub_version}"
+      checksum[:dub] = download_and_deploy uri, "development/d-tools/dub-#{dub_version}.tar.gz"
+
+      checksum[:dscanner] = clone 'https://github.com/dlang-community/D-Scanner.git',
+        "development/d-tools/D-Scanner-#{dscanner_version}.tar.xz"
+      checksum[:dcd] = clone 'https://github.com/dlang-community/DCD.git',
+        "development/d-tools/DCD-#{dcd_version}.tar.xz"
+
+      checksum
+    end
+
+    private_class_method def self.update_tools_versions(dub_version, dscanner_version, dcd_version)
+      slackbuild_filename = 'slackbuilds/development/d-tools/d-tools.SlackBuild'
+      slackbuild_contents = File.read(slackbuild_filename)
+        .gsub(/^DUB_VERSION=\${DUB_VERSION:-.+/,
+          "DUB_VERSION=${DUB_VERSION:-#{dub_version}}")
+        .gsub(/^DSCANNER_VERSION=\${DSCANNER_VERSION:-.+/,
+          "DSCANNER_VERSION=${DSCANNER_VERSION:-#{dscanner_version}}")
+        .gsub(/^DCD_VERSION=\${DCD_VERSION:-.+/,
+          "DCD_VERSION=${DCD_VERSION:-#{dcd_version}}")
+      File.open(slackbuild_filename, 'w') { |file| file.puts slackbuild_contents }
+    end
+  end
+end