diff --git a/.travis.yml b/.travis.yml
index 67c2a728..26a4f658 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,17 +3,19 @@
 language: ruby
 install: true
 script: "script/cibuild"
-dist: precise
+
+before_install:
+  - gem install bundler -v 1.15.4
 
 matrix:
   include:
     # Build with latest ruby
-    - rvm: 2.4.1
+    - rvm: 2.4
       env: RUBOCOP_TEST="true" RSPEC_TEST="true"
     # Build with older ruby versions
-    - rvm: 2.3.4
+    - rvm: 2.3.2
       env: RUBOCOP_TEST="false" RSPEC_TEST="true"
-    - rvm: 2.2
+    - rvm: 2.2.3
       env: RUBOCOP_TEST="false" RSPEC_TEST="true"
     - rvm: 2.1
       env: RUBOCOP_TEST="false" RSPEC_TEST="true"
diff --git a/.version b/.version
index 88c5fb89..347f5833 100644
--- a/.version
+++ b/.version
@@ -1 +1 @@
-1.4.0
+1.4.1
diff --git a/doc/CHANGELOG.md b/doc/CHANGELOG.md
index d1811055..1ddf9d89 100644
--- a/doc/CHANGELOG.md
+++ b/doc/CHANGELOG.md
@@ -8,6 +8,13 @@
 </tr>
 </thead><tbody>
 <tr valign=top>
+<td>1.4.1</td>
+<td>2017-10-02</td>
+<td>
+<li><a href="https://github.com/github/octocatalog-diff/pull/149">#149</a>: (Internal) Set ports on PuppetDB URLs without altering constants</li>
+</td>
+</tr>
+<tr valign=top>
 <td>1.4.0</td>
 <td>2017-08-03</td>
 <td>
diff --git a/lib/octocatalog-diff/puppetdb.rb b/lib/octocatalog-diff/puppetdb.rb
index 39bfb56c..fb93d9d4 100644
--- a/lib/octocatalog-diff/puppetdb.rb
+++ b/lib/octocatalog-diff/puppetdb.rb
@@ -5,16 +5,12 @@
 
 require 'uri'
 
-# Redefine constants to match PuppetDB defaults.
-# This code avoids warnings about redefining constants.
-URI::HTTP.send(:remove_const, :DEFAULT_PORT) if URI::HTTP.const_defined?(:DEFAULT_PORT)
-URI::HTTP.const_set(:DEFAULT_PORT, 8080)
-URI::HTTPS.send(:remove_const, :DEFAULT_PORT) if URI::HTTPS.const_defined?(:DEFAULT_PORT)
-URI::HTTPS.const_set(:DEFAULT_PORT, 8081)
-
 module OctocatalogDiff
   # A standard way to connect to PuppetDB from the various scripts in this repository.
   class PuppetDB
+    DEFAULT_HTTPS_PORT = 8081
+    DEFAULT_HTTP_PORT = 8080
+
     # Allow connections to be read (used in tests for now)
     attr_reader :connections
 
@@ -54,7 +50,7 @@ def initialize(options = {})
           urls.map { |url| parse_url(url) }
         elsif options.key?(:puppetdb_host)
           is_ssl = options.fetch(:puppetdb_ssl, true)
-          default_port = is_ssl ? URI::HTTPS::DEFAULT_PORT : URI::HTTP::DEFAULT_PORT
+          default_port = is_ssl ? DEFAULT_HTTPS_PORT : DEFAULT_HTTP_PORT
           port = options.fetch(:puppetdb_port, default_port).to_i
           [{ ssl: is_ssl, host: options[:puppetdb_host], port: port }]
         elsif ENV['PUPPETDB_URL'] && !ENV['PUPPETDB_URL'].empty?
@@ -64,7 +60,7 @@ def initialize(options = {})
           # This will get the env var and see if it equals 'true'; the result
           # of this == comparison is the true/false boolean we need.
           is_ssl = ENV.fetch('PUPPETDB_SSL', 'true') == 'true'
-          default_port = is_ssl ? URI::HTTPS::DEFAULT_PORT : URI::HTTP::DEFAULT_PORT
+          default_port = is_ssl ? DEFAULT_HTTPS_PORT : DEFAULT_HTTP_PORT
           port = ENV.fetch('PUPPETDB_PORT', default_port).to_i
           [{ ssl: is_ssl, host: ENV['PUPPETDB_HOST'], port: port }]
         else
@@ -152,6 +148,10 @@ def _get(path)
     # @return [Hash] { ssl: true/false, host: <String>, port: <Integer> }
     def parse_url(url)
       uri = URI(url)
+      if URI.split(url)[3].nil?
+        uri.port = uri.scheme == 'https' ? DEFAULT_HTTPS_PORT : DEFAULT_HTTP_PORT
+      end
+
       raise ArgumentError, "URL #{url} has invalid scheme" unless uri.scheme =~ /^https?$/
       { ssl: uri.scheme == 'https', host: uri.host, port: uri.port }
     rescue URI::InvalidURIError => exc
diff --git a/octocatalog-diff.gemspec b/octocatalog-diff.gemspec
index c939344a..7d753908 100644
--- a/octocatalog-diff.gemspec
+++ b/octocatalog-diff.gemspec
@@ -1,7 +1,7 @@
 require_relative 'lib/octocatalog-diff/version'
 require 'json'
 
-DEFAULT_PUPPET_VERSION = '4.10.0'.freeze
+DEFAULT_PUPPET_VERSION = '4.10.8'.freeze
 
 Gem::Specification.new do |s|
   s.required_ruby_version = '>= 2.0.0'
@@ -30,6 +30,7 @@ EOF
   s.add_runtime_dependency 'hashdiff', '>= 0.3.0'
   s.add_runtime_dependency 'rugged', '>= 0.25.0b2'
 
+  s.add_development_dependency 'bundler', '1.15.4'
   s.add_development_dependency 'rspec', '~> 3.4.0'
   s.add_development_dependency 'rake', '11.2.2'
   s.add_development_dependency 'parallel_tests', '2.7.1'
diff --git a/script/bootstrap b/script/bootstrap
index 5664e543..e9689e78 100755
--- a/script/bootstrap
+++ b/script/bootstrap
@@ -4,12 +4,6 @@ echo 'Starting script/bootstrap'
 
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd .. && pwd )"
 
-# FIXME: Remove when CI is switched to Travis
-if env | grep ^JANKY_ >/dev/null 2>&1 ; then
-  export PATH=/usr/share/rbenv/shims:$PATH
-  export RBENV_VERSION=2.1.2-github
-fi
-
 rm -rf "${DIR}/.bundle"
 rm -f "${DIR}/.puppet_version"
 set -e
diff --git a/script/cibuild b/script/cibuild
index eb141036..c96c80c9 100755
--- a/script/cibuild
+++ b/script/cibuild
@@ -6,21 +6,27 @@
 # with one or more Puppet versions, with PUPPET_VERSIONS set to a space-separated list
 # of versions to test.
 
-[ -z "$PUPPET_VERSIONS" ] && export PUPPET_VERSIONS='3.8.7 4.10.0 5.0.0'
+[ -z "$PUPPET_VERSIONS" ] && export PUPPET_VERSIONS='3.8.7 4.10.8 5.0.0'
 [ -z "$RUBOCOP_TEST" ] && export RUBOCOP_TEST='true'
 [ -z "$RSPEC_TEST" ] && export RSPEC_TEST='true'
 
 echo 'Starting script/cibuild'
 
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd .. && pwd )"
+env
 
 # Create a temporary file to capture output of various steps.
 export OUTPUT_FILE="$(mktemp)"
 function cleanup() {
   rm -rf "$OUTPUT_FILE"
+  rm -f "${DIR}/.ruby-version"
 }
 trap cleanup EXIT
 
+# Create "$DIR/.ruby-version" from the current ruby version, so it propagates through
+# to the clean environment under which Puppet runs.
+ruby -e "print RUBY_VERSION" > "${DIR}/.ruby-version"
+
 # Bootstrapping
 function bootstrap() {
   echo "Bootstrapping..."
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