diff --git a/.docker/Dockerfile-centos_6 b/.docker/Dockerfile-centos_6
new file mode 100644
index 00000000..b15c5d5a
--- /dev/null
+++ b/.docker/Dockerfile-centos_6
@@ -0,0 +1,5 @@
+FROM centos:6
+
+RUN yum install -y ruby libjpeg-turbo libpng libXrender fontconfig libXext
+
+CMD /root/wkhtmltopdf_binary_gem/bin/wkhtmltopdf --version
diff --git a/.docker/Dockerfile-centos_7 b/.docker/Dockerfile-centos_7
new file mode 100644
index 00000000..00923778
--- /dev/null
+++ b/.docker/Dockerfile-centos_7
@@ -0,0 +1,5 @@
+FROM centos:7
+
+RUN yum install -y ruby libjpeg-turbo libpng libXrender fontconfig libXext
+
+CMD /root/wkhtmltopdf_binary_gem/bin/wkhtmltopdf --version
diff --git a/.docker/Dockerfile-debian_8 b/.docker/Dockerfile-debian_8
new file mode 100644
index 00000000..da33b16e
--- /dev/null
+++ b/.docker/Dockerfile-debian_8
@@ -0,0 +1,8 @@
+FROM debian:8
+
+ENV DEBIAN_FRONTEND noninteractive
+
+RUN apt-get update
+RUN apt-get install -y ruby libjpeg62-turbo libpng12-0 libxrender1 libfontconfig1 libxext6
+
+CMD /root/wkhtmltopdf_binary_gem/bin/wkhtmltopdf --version
diff --git a/.docker/Dockerfile-debian_9 b/.docker/Dockerfile-debian_9
new file mode 100644
index 00000000..cc66dfaf
--- /dev/null
+++ b/.docker/Dockerfile-debian_9
@@ -0,0 +1,8 @@
+FROM debian:9
+
+ENV DEBIAN_FRONTEND noninteractive
+
+RUN apt-get update
+RUN apt-get install -y ruby libjpeg62-turbo libpng16-16 libxrender1 libfontconfig1 libxext6
+
+CMD /root/wkhtmltopdf_binary_gem/bin/wkhtmltopdf --version
diff --git a/.docker/Dockerfile-ubuntu_14.04 b/.docker/Dockerfile-ubuntu_14.04
new file mode 100644
index 00000000..d3eb10ae
--- /dev/null
+++ b/.docker/Dockerfile-ubuntu_14.04
@@ -0,0 +1,8 @@
+FROM ubuntu:14.04
+
+ENV DEBIAN_FRONTEND noninteractive
+
+RUN apt-get update
+RUN apt-get install -y ruby libjpeg8 libxrender1 libfontconfig1
+
+CMD /root/wkhtmltopdf_binary_gem/bin/wkhtmltopdf --version
diff --git a/.docker/Dockerfile-ubuntu_16.04 b/.docker/Dockerfile-ubuntu_16.04
new file mode 100644
index 00000000..9a971b1b
--- /dev/null
+++ b/.docker/Dockerfile-ubuntu_16.04
@@ -0,0 +1,8 @@
+FROM ubuntu:16.04
+
+ENV DEBIAN_FRONTEND noninteractive
+
+RUN apt-get update
+RUN apt-get install -y ruby libjpeg8 libxrender1 libfontconfig1
+
+CMD /root/wkhtmltopdf_binary_gem/bin/wkhtmltopdf --version
diff --git a/.docker/Dockerfile-ubuntu_18.04 b/.docker/Dockerfile-ubuntu_18.04
new file mode 100644
index 00000000..d2e46a11
--- /dev/null
+++ b/.docker/Dockerfile-ubuntu_18.04
@@ -0,0 +1,8 @@
+FROM ubuntu:18.04
+
+ENV DEBIAN_FRONTEND noninteractive
+
+RUN apt-get update
+RUN apt-get install -y ruby libjpeg8 libxrender1 libfontconfig1
+
+CMD /root/wkhtmltopdf_binary_gem/bin/wkhtmltopdf --version
diff --git a/.gitignore b/.gitignore
index 088af208..4f3a9da5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,17 @@
 pkg/*
+bin/wkhtmltopdf_centos_6_amd64
+bin/wkhtmltopdf_centos_7_amd64
+bin/wkhtmltopdf_debian_8_amd64
+bin/wkhtmltopdf_debian_9_amd64
+bin/wkhtmltopdf_macos_cocoa
+bin/wkhtmltopdf_macos_carbon
+bin/wkhtmltopdf_ubuntu_14.04_amd64
+bin/wkhtmltopdf_ubuntu_16.04_amd64
+bin/wkhtmltopdf_ubuntu_18.04_amd64
+bin/wkhtmltopdf_centos_6_i386
+bin/wkhtmltopdf_centos_7_i386
+bin/wkhtmltopdf_debian_8_i386
+bin/wkhtmltopdf_debian_9_i386
+bin/wkhtmltopdf_ubuntu_14.04_i386
+bin/wkhtmltopdf_ubuntu_16.04_i386
+bin/wkhtmltopdf_ubuntu_18.04_i386
diff --git a/CHANGELOG b/CHANGELOG
index f50dd6b0..c9f7b39e 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,6 @@
+# 0.12.5
+Update `wkhtmltopdf` binaries with version 0.12.5
+
 # 0.12.4
 Update `wkhtmltopdf` binaries with version 0.12.4
 
diff --git a/README.md b/README.md
new file mode 100644
index 00000000..34646012
--- /dev/null
+++ b/README.md
@@ -0,0 +1,36 @@
+# wkhtmltopdf_binary_gem
+
+## Extracting binaries
+
+Hints for extracting binaries from https://wkhtmltopdf.org/downloads.html (dpkg and rpm2cpio is available on Homebrew).
+
+Debian/Ubuntu
+
+    dpkg -x wkhtmltox_0.12.5-1.trusty_amd64.deb .
+
+CentOS
+
+    rpm2cpio wkhtmltox-0.12.5-1.centos7.x86_64.rpm | cpio -idmv
+
+macOS
+
+    xar -xf wkhtmltox-0.12.5-1.macos-cocoa.pkg
+    cat Payload | gunzip -dc | cpio -i
+
+## Compression
+
+Binaries should be compressed with `gzip --best` after extracting. The matching binary will be extracted on first
+execution of `bin/wkhtmltopdf`.
+
+## Testing with Docker
+
+Make sure you have Docker and Docker Compose installed (see https://docs.docker.com/compose/install/ for more
+information).
+
+There are Dockerfiles for the supported Linux based distributions under `.docker`. You can build them all with
+`docker-compose build` and run each individually with e.g. `docker-compose run ubuntu_18.04`.
+
+There also is a rudimentary minitest test that simply invokes `docker-compose run` for each distribution and
+expects to see the output of `wkhtmltopdf --version`. Just run `rake` to run it. 
+
+You can clean up after testing with `docker-compose down --rmi all`.
diff --git a/Rakefile b/Rakefile
index c9a610ae..b0c5ab7d 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,7 +1,15 @@
 require 'rubygems'
 require 'rubygems/package_task'
+require 'rake/testtask'
 
 spec = eval(File.new("wkhtmltopdf-binary.gemspec").readlines.join("\n"))
 Gem::PackageTask.new(spec) do |pkg|
   pkg.need_tar = true
 end
+
+Rake::TestTask.new do |t|
+  t.libs << 'test'
+end
+
+desc 'Run tests'
+task default: :test
diff --git a/bin/wkhtmltopdf b/bin/wkhtmltopdf
index 313aa602..eabe5b12 100755
--- a/bin/wkhtmltopdf
+++ b/bin/wkhtmltopdf
@@ -8,14 +8,38 @@
 # of the License at http://www.apache.org/licenses/LICENSE-2.0
 
 require 'rbconfig'
+require 'zlib'
 
 suffix = case RbConfig::CONFIG['host_os']
-when /linux/
-  (RbConfig::CONFIG['host_cpu'] == 'x86_64') ? 'linux_amd64' : 'linux_x86'
-when /darwin/
-  'darwin_x86'
-else
-  raise "Invalid platform. Must be running on linux or intel-based Mac OS."
+         when /linux/
+           os = `. /etc/os-release 2> /dev/null && echo ${ID}_${VERSION_ID}`.strip
+
+           # CentOS 6 doesn't have `/etc/os-release`.
+           if os.empty? && File.read('/etc/centos-release').start_with?('CentOS release 6')
+             os = 'centos_6'
+           end
+
+           architecture = RbConfig::CONFIG['host_cpu'] == 'x86_64' ? 'amd64' : 'i386'
+
+           "#{os}_#{architecture}"
+         when /darwin/
+           RbConfig::CONFIG['host_cpu'] == 'x86_64' ? 'macos_cocoa' : 'macos_carbon'
+         else
+           'unknown'
+         end
+
+binary = "#{__FILE__}_#{suffix}"
+
+if File.exist?("#{binary}.gz") && !File.exist?(binary)
+  File.open binary, 'wb', 0o755 do |file|
+    Zlib::GzipReader.open("#{binary}.gz") { |gzip| file << gzip.read }
+  end
+end
+
+unless File.exist? binary
+  raise 'Invalid platform, must be running on Ubuntu 14.04/16.04/18.04 ' \
+        'CentOS 6/7, Debian 8/9, or intel-based macOS ' \
+        "(missing binary: #{binary})."
 end
 
-system *$*.unshift("#{__FILE__}_#{suffix}")
+system *$*.unshift(binary)
diff --git a/bin/wkhtmltopdf_centos_6_amd64.gz b/bin/wkhtmltopdf_centos_6_amd64.gz
new file mode 100755
index 00000000..0c0e008b
Binary files /dev/null and b/bin/wkhtmltopdf_centos_6_amd64.gz differ
diff --git a/bin/wkhtmltopdf_centos_6_i386.gz b/bin/wkhtmltopdf_centos_6_i386.gz
new file mode 100755
index 00000000..fd81a618
Binary files /dev/null and b/bin/wkhtmltopdf_centos_6_i386.gz differ
diff --git a/bin/wkhtmltopdf_centos_7_amd64.gz b/bin/wkhtmltopdf_centos_7_amd64.gz
new file mode 100755
index 00000000..f19061dd
Binary files /dev/null and b/bin/wkhtmltopdf_centos_7_amd64.gz differ
diff --git a/bin/wkhtmltopdf_centos_7_i386.gz b/bin/wkhtmltopdf_centos_7_i386.gz
new file mode 100755
index 00000000..18a96019
Binary files /dev/null and b/bin/wkhtmltopdf_centos_7_i386.gz differ
diff --git a/bin/wkhtmltopdf_darwin_x86 b/bin/wkhtmltopdf_darwin_x86
deleted file mode 100755
index 23c6042c..00000000
Binary files a/bin/wkhtmltopdf_darwin_x86 and /dev/null differ
diff --git a/bin/wkhtmltopdf_debian_8_amd64.gz b/bin/wkhtmltopdf_debian_8_amd64.gz
new file mode 100755
index 00000000..14ad9c63
Binary files /dev/null and b/bin/wkhtmltopdf_debian_8_amd64.gz differ
diff --git a/bin/wkhtmltopdf_debian_8_i386.gz b/bin/wkhtmltopdf_debian_8_i386.gz
new file mode 100755
index 00000000..16ab0bd5
Binary files /dev/null and b/bin/wkhtmltopdf_debian_8_i386.gz differ
diff --git a/bin/wkhtmltopdf_debian_9_amd64.gz b/bin/wkhtmltopdf_debian_9_amd64.gz
new file mode 100755
index 00000000..705708a5
Binary files /dev/null and b/bin/wkhtmltopdf_debian_9_amd64.gz differ
diff --git a/bin/wkhtmltopdf_debian_9_i386.gz b/bin/wkhtmltopdf_debian_9_i386.gz
new file mode 100755
index 00000000..d6c8b7a2
Binary files /dev/null and b/bin/wkhtmltopdf_debian_9_i386.gz differ
diff --git a/bin/wkhtmltopdf_linux_amd64 b/bin/wkhtmltopdf_linux_amd64
deleted file mode 100755
index a90fa1c7..00000000
Binary files a/bin/wkhtmltopdf_linux_amd64 and /dev/null differ
diff --git a/bin/wkhtmltopdf_linux_x86 b/bin/wkhtmltopdf_linux_x86
deleted file mode 100755
index 2870aeb9..00000000
Binary files a/bin/wkhtmltopdf_linux_x86 and /dev/null differ
diff --git a/bin/wkhtmltopdf_macos_carbon.gz b/bin/wkhtmltopdf_macos_carbon.gz
new file mode 100755
index 00000000..584d8707
Binary files /dev/null and b/bin/wkhtmltopdf_macos_carbon.gz differ
diff --git a/bin/wkhtmltopdf_macos_cocoa.gz b/bin/wkhtmltopdf_macos_cocoa.gz
new file mode 100755
index 00000000..8bc0b68e
Binary files /dev/null and b/bin/wkhtmltopdf_macos_cocoa.gz differ
diff --git a/bin/wkhtmltopdf_ubuntu_14.04_amd64.gz b/bin/wkhtmltopdf_ubuntu_14.04_amd64.gz
new file mode 100755
index 00000000..ba264b8e
Binary files /dev/null and b/bin/wkhtmltopdf_ubuntu_14.04_amd64.gz differ
diff --git a/bin/wkhtmltopdf_ubuntu_14.04_i386.gz b/bin/wkhtmltopdf_ubuntu_14.04_i386.gz
new file mode 100755
index 00000000..7cfd134e
Binary files /dev/null and b/bin/wkhtmltopdf_ubuntu_14.04_i386.gz differ
diff --git a/bin/wkhtmltopdf_ubuntu_16.04_amd64.gz b/bin/wkhtmltopdf_ubuntu_16.04_amd64.gz
new file mode 100755
index 00000000..c7689951
Binary files /dev/null and b/bin/wkhtmltopdf_ubuntu_16.04_amd64.gz differ
diff --git a/bin/wkhtmltopdf_ubuntu_16.04_i386.gz b/bin/wkhtmltopdf_ubuntu_16.04_i386.gz
new file mode 100755
index 00000000..d81692d9
Binary files /dev/null and b/bin/wkhtmltopdf_ubuntu_16.04_i386.gz differ
diff --git a/bin/wkhtmltopdf_ubuntu_18.04_amd64.gz b/bin/wkhtmltopdf_ubuntu_18.04_amd64.gz
new file mode 100755
index 00000000..5831e409
Binary files /dev/null and b/bin/wkhtmltopdf_ubuntu_18.04_amd64.gz differ
diff --git a/bin/wkhtmltopdf_ubuntu_18.04_i386.gz b/bin/wkhtmltopdf_ubuntu_18.04_i386.gz
new file mode 100755
index 00000000..a7a2f539
Binary files /dev/null and b/bin/wkhtmltopdf_ubuntu_18.04_i386.gz differ
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 00000000..00d47ea0
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,52 @@
+version: '3'
+
+services:
+
+  ubuntu_14.04:
+    build:
+      context: .
+      dockerfile: .docker/Dockerfile-ubuntu_14.04
+    volumes:
+      - .:/root/wkhtmltopdf_binary_gem
+
+  ubuntu_16.04:
+    build:
+      context: .
+      dockerfile: .docker/Dockerfile-ubuntu_16.04
+    volumes:
+      - .:/root/wkhtmltopdf_binary_gem
+
+  ubuntu_18.04:
+    build:
+      context: .
+      dockerfile: .docker/Dockerfile-ubuntu_18.04
+    volumes:
+      - .:/root/wkhtmltopdf_binary_gem
+
+  debian_8:
+    build:
+      context: .
+      dockerfile: .docker/Dockerfile-debian_8
+    volumes:
+      - .:/root/wkhtmltopdf_binary_gem
+
+  debian_9:
+    build:
+      context: .
+      dockerfile: .docker/Dockerfile-debian_9
+    volumes:
+      - .:/root/wkhtmltopdf_binary_gem
+
+  centos_6:
+    build:
+      context: .
+      dockerfile: .docker/Dockerfile-centos_6
+    volumes:
+      - .:/root/wkhtmltopdf_binary_gem
+
+  centos_7:
+    build:
+      context: .
+      dockerfile: .docker/Dockerfile-centos_7
+    volumes:
+      - .:/root/wkhtmltopdf_binary_gem
diff --git a/test/test_with_docker.rb b/test/test_with_docker.rb
new file mode 100644
index 00000000..05e18c71
--- /dev/null
+++ b/test/test_with_docker.rb
@@ -0,0 +1,46 @@
+require 'minitest/autorun'
+
+class WithDockerTest < Minitest::Test
+  # Run code before a group of test (see: https://github.com/seattlerb/minitest#how-to-run-code-before-a-group-of-tests)
+  SETUP = begin
+    `docker-compose build`
+  end
+
+  def test_centos_6
+    test with: 'centos_6'
+  end
+
+  def test_centos_7
+    test with: 'centos_7'
+  end
+
+  def test_debian_8
+    test with: 'debian_8'
+  end
+
+  def test_debian_9
+    test with: 'debian_9'
+  end
+
+  def test_with_ubuntu_14
+    test with: 'ubuntu_14.04'
+  end
+
+  def test_with_ubuntu_16
+    test with: 'ubuntu_16.04'
+  end
+
+  def test_with_ubuntu_18
+    test with: 'ubuntu_18.04'
+  end
+
+  def test_with_macos
+    assert_equal `bin/wkhtmltopdf --version`.strip, 'wkhtmltopdf 0.12.5 (with patched qt)'
+  end
+
+  private
+
+  def test(with:)
+    assert_equal `docker-compose run --rm #{with}`.strip, 'wkhtmltopdf 0.12.5 (with patched qt)'
+  end
+end
diff --git a/wkhtmltopdf-binary.gemspec b/wkhtmltopdf-binary.gemspec
index 713ed937..bb676814 100644
--- a/wkhtmltopdf-binary.gemspec
+++ b/wkhtmltopdf-binary.gemspec
@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |s|
   s.name = "wkhtmltopdf-binary"
-  s.version = "0.12.4"
+  s.version = "0.12.5"
   s.license = "Apache-2.0"
   s.author = "Zakir Durumeric"
   s.email = "zakird@gmail.com"
@@ -12,4 +12,6 @@ Gem::Specification.new do |s|
   s.has_rdoc = false
   s.executables << "wkhtmltopdf"
   s.require_path = '.'
+
+  s.add_development_dependency "minitest"
 end