diff --git a/.gitattributes b/.gitattributes
index 31c95b3..bbfa8e9 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -5,3 +5,4 @@
 /tests            export-ignore
 /phpunit.xml.dist export-ignore
 /phpcs.xml        export-ignore
+/util             export-ignore
diff --git a/.gitignore b/.gitignore
index 0a59599..9d4b4c6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
-.idea/
 *.phar
 .DS_Store
+.idea/
+.vagrant/
 build
 composer.lock
 docs
diff --git a/.travis.yml b/.travis.yml
index e1712a6..ee70a23 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,30 +1,35 @@
-language: php
+# Fake out Travis CI, since PHP isn't supported when using their Docker services
+language: python
 
-php:
-  - 5.4
-  - 5.5
-  - 5.6
-  - 7.0
-  - hhvm
+env:
+  - PHP_VERSION=5.4.45 ARCH=x86_64
+  - PHP_VERSION=5.4.45 ARCH=mips
+  - PHP_VERSION=5.5.30 ARCH=x86_64
+  - PHP_VERSION=5.5.30 ARCH=mips
+  - PHP_VERSION=5.6.14 ARCH=x86_64
+  - PHP_VERSION=5.6.14 ARCH=mips
+  - PHP_VERSION=7.0.0RC4 ARCH=x86_64
+  - PHP_VERSION=hhvm ARCH=x86_64
 
-sudo: false
+sudo: required
 
 addons:
   apt:
     packages:
-      - uuid-dev
+      - php5-cli
+      - php5-curl
+      - qemu-user-static
 
-before_script:
-  - travis_retry composer self-update
-  - travis_retry composer install --no-interaction --prefer-dist
-  - sh -c 'if [ "$TRAVIS_PHP_VERSION" != "hhvm" ]; then printf "\n" | pecl install uuid; fi;'
-  - phpenv rehash
+services:
+  - docker
+
+install:
+  - curl -sS https://getcomposer.org/installer | php
+  - travis_retry php composer.phar install --no-interaction --prefer-dist
+  - mkdir -p build/logs
 
 script:
-  - mkdir -p build/logs
-  - ./vendor/bin/parallel-lint src tests
-  - ./vendor/bin/phpunit --verbose
-  - ./vendor/bin/phpcs src --standard=psr2 -sp
+  - bash -ex ./util/run-tests.sh
 
 after_script:
   - php vendor/bin/coveralls
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index d7390e2..0977458 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -60,3 +60,19 @@ The following tests must pass before we will accept a pull request. If any of th
 ./vendor/bin/phpunit --verbose
 ./vendor/bin/phpcs src --standard=psr2 -sp
 ```
+
+### Locally Test With Emulated MIPS Architecture
+
+The following commands use [Vagrant](https://www.vagrantup.com/) to start an Ubuntu VM, install necessary dependencies, and then run the `util/run-tests.sh` script that will download a Docker image emulating the MIPS architecture. This is especially helpful for testing UUID generation in a big-endian environment.
+
+```
+vagrant init ubuntu/trusty64
+vagrant up
+vagrant ssh
+sudo apt-get install docker.io qemu-user-static php5-cli php5-curl
+cd /vagrant
+curl -sS https://getcomposer.org/installer | php
+php composer.phar install --no-interaction --prefer-dist
+mkdir -p build/logs
+ARCH=mips PHP_VERSION=5.6.14 TRAVIS_BUILD_DIR=/vagrant ./util/run-tests.sh
+```
diff --git a/tests/src/UuidTest.php b/tests/src/UuidTest.php
index 7b0ae15..ea976cf 100644
--- a/tests/src/UuidTest.php
+++ b/tests/src/UuidTest.php
@@ -838,6 +838,7 @@ class UuidTest extends TestCase
         $previous = $factory->uuid4();
 
         for ($i = 0; $i < 1000; $i ++) {
+            usleep(10);
             $uuid = $factory->uuid4();
             $this->assertGreaterThan($previous->toString(), $uuid->toString());
 
diff --git a/util/build-docker-image.sh b/util/build-docker-image.sh
new file mode 100755
index 0000000..5134e12
--- /dev/null
+++ b/util/build-docker-image.sh
@@ -0,0 +1,129 @@
+#!/bin/bash
+### Build a Docker image for a target PHP version, CPU arch, and Debian version
+#
+# Based on: https://github.com/docker-32bit/debian
+#
+# See also:
+# https://www.tomaz.me/2013/12/02/running-travis-ci-tests-on-arm.html
+#
+# Note: Building HHVM with this script is not supported. See instead:
+# https://gist.github.com/ramsey/04cb15ff955d54484980
+#
+# Recommended approach for running this script to build Docker images:
+#
+#     vagrant init ubuntu/trusty64
+#     vagrant up
+#     vagrant ssh
+#     sudo apt-get install docker.io
+#     sudo docker login
+#     cd /vagrant
+#     sudo ./util/build-docker-image.sh 5.6.14 mips mips wheezy
+#
+# or (for 64-bit, standard Debian):
+#
+#     sudo ./util/build-docker-image.sh 5.6.14 x86_64 amd64 wheezy
+#
+
+if [ $EUID -ne 0 ]; then
+   echo "This script must be run as root" 1>&2
+   exit 1
+fi
+
+### settings
+php_version=${1:-5.6.14}
+qemu_arch=${2:-mips}
+deb_arch=${3:-mips}
+suite=${4:-wheezy}
+
+chroot_dir="/tmp/chroot/${qemu_arch}-${suite}-php-${php_version}"
+apt_mirror="http://ftp.us.debian.org/debian"
+docker_image="benramsey/ramsey-uuid:${qemu_arch}-${suite}-php-${php_version}"
+tmp_package="/tmp/${qemu_arch}-${suite}-php-${php_version}.tgz"
+
+if [ `echo "${php_version}" | cut -c 1` = "7" ]; then
+    php_package="https://downloads.php.net/~ab/php-${php_version}.tar.bz2"
+else
+    php_package="https://secure.php.net/distributions/php-${php_version}.tar.bz2"
+fi
+
+### make sure that the required tools are installed
+export DEBIAN_FRONTEND=noninteractive
+apt-get update
+apt-get install -y wget debootstrap qemu-user-static binfmt-support \
+    docker.io php5-cli php5-curl
+
+### install a minbase system with debootstrap
+debootstrap --foreign --arch=$deb_arch $suite $chroot_dir $apt_mirror
+cp "/usr/bin/qemu-${qemu_arch}-static" $chroot_dir/usr/bin/
+chroot $chroot_dir ./debootstrap/debootstrap --second-stage
+
+### update the list of package sources
+cat <<EOF > $chroot_dir/etc/apt/sources.list
+deb $apt_mirror $suite main contrib non-free
+deb $apt_mirror $suite-updates main contrib non-free
+deb http://security.debian.org/ $suite/updates main contrib non-free
+EOF
+
+### upgrade packages
+chroot $chroot_dir apt-get update -qq
+chroot $chroot_dir apt-get upgrade -qq -y
+
+### locale configuration
+chroot $chroot_dir apt-get install -qq -y debconf
+chroot $chroot_dir bash -c 'echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen'
+chroot $chroot_dir dpkg-reconfigure locales
+
+### install dependencies to build PHP
+chroot $chroot_dir apt-get --allow-unauthenticated install -qq -y \
+    autoconf build-essential libcurl3-openssl-dev libgmp-dev libmcrypt-dev \
+    libreadline-dev libxml2-dev uuid-dev curl git
+
+### download, build, and install the PHP version needed for this chroot
+mkdir -p $chroot_dir/php-src
+cd $chroot_dir/php-src
+wget $php_package
+tar jxf "php-${php_version}.tar.bz2"
+chroot $chroot_dir bash -c "cd /php-src/php-${php_version} && ./configure --disable-all --enable-bcmath --with-gmp --disable-cgi --enable-xml --enable-libxml --enable-dom --enable-filter --enable-ctype --enable-json --with-openssl --enable-phar --enable-hash --with-curl --enable-simplexml --enable-tokenizer --enable-xmlwriter --enable-zip"
+chroot $chroot_dir bash -c "cd /php-src/php-${php_version} && make && make install"
+chroot $chroot_dir cp "/php-src/php-${php_version}/php.ini-development" /usr/local/lib/php.ini
+
+### download, build, and install the PECL UUID extension
+wget https://pecl.php.net/get/uuid-1.0.4.tgz
+tar zxf uuid-1.0.4.tgz
+chroot $chroot_dir bash -c "cd /php-src/uuid-1.0.4 && phpize && ./configure && make && make install"
+chroot $chroot_dir bash -c 'printf "date.timezone=UTC\n" >> /usr/local/lib/php.ini'
+chroot $chroot_dir bash -c 'printf "extension=uuid.so\n" >> /usr/local/lib/php.ini'
+
+if [ `echo "${php_version}" | cut -c 1` != "7" ]; then
+    ### download, build, and install Xdebug, if not PHP 7
+    wget http://xdebug.org/files/xdebug-2.3.3.tgz
+    tar zxf xdebug-2.3.3.tgz
+    chroot $chroot_dir bash -c "cd /php-src/xdebug-2.3.3 && phpize && ./configure --enable-xdebug && make && make install"
+    chroot $chroot_dir bash -c "printf \"zend_extension=\$(php -r \"echo ini_get('extension_dir');\")/xdebug.so\n\" >> /usr/local/lib/php.ini"
+fi
+
+### globally install Composer
+chroot $chroot_dir bash -c "curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer"
+
+### cleanup
+chroot $chroot_dir apt-get autoclean
+chroot $chroot_dir apt-get clean
+chroot $chroot_dir apt-get autoremove
+
+cd /tmp
+rm -rf $chroot_dir/php-src
+
+### create a tar archive from the chroot directory
+tar cfz $tmp_package -C $chroot_dir .
+
+### import this tar archive into a docker image:
+cat $tmp_package | docker import - $docker_image
+
+### push image to Docker Hub
+docker push $docker_image
+
+### cleanup
+rm $tmp_package
+rm -rf $chroot_dir
+
+echo "Done!"
diff --git a/util/run-tests.sh b/util/run-tests.sh
new file mode 100755
index 0000000..44edd04
--- /dev/null
+++ b/util/run-tests.sh
@@ -0,0 +1,42 @@
+#!/bin/bash
+### Run tests based on CPU architecture
+#
+# Depending on the ARCH indicated for this test job, run the tests in a
+# Docker container based on the PHP version for this job.
+#
+
+if [ -z "${ARCH}" ]; then
+    echo "The ARCH environment variable must be provided"
+    exit 1
+fi
+
+if [ -z "${PHP_VERSION}" ]; then
+    echo "The PHP_VERSION environment variable must be provided"
+    exit 1
+fi
+
+if [ -z "${TRAVIS_BUILD_DIR}" ]; then
+    echo "The TRAVIS_BUILD_DIR environment variable must be provided"
+    exit 1
+fi
+
+if [ "${PHP_VERSION}" = "hhvm" ]; then
+    docker_tag="${ARCH}-trusty-php-${PHP_VERSION}"
+else
+    docker_tag="${ARCH}-wheezy-php-${PHP_VERSION}"
+fi
+
+declare -a commands
+commands[0]="echo \"Environment: \$(uname -a)\""
+commands[1]="php --version"
+commands[2]="cd ${TRAVIS_BUILD_DIR}"
+commands[3]="./vendor/bin/parallel-lint src tests"
+commands[4]="./vendor/bin/phpcs src --standard=psr2 -sp"
+commands[5]="./vendor/bin/phpunit --verbose"
+
+printf -v command "%s && " "${commands[@]}"
+command=${command::-4}
+
+sudo docker run -v "${TRAVIS_BUILD_DIR}":"${TRAVIS_BUILD_DIR}" \
+    benramsey/ramsey-uuid:$docker_tag \
+    bash -c "${command}"