diff --git a/Dockerfile b/Dockerfile
index 63bfa7fc4..ca0f0a87b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:xenial
+FROM ubuntu:focal
 MAINTAINER Ryan Baumann <ryan.baumann@gmail.com>
 
 # Install the Ubuntu packages.
@@ -8,8 +8,8 @@ MAINTAINER Ryan Baumann <ryan.baumann@gmail.com>
 ENV DEBIAN_FRONTEND=noninteractive
 RUN apt-get update && \
   apt-get install -y git wget subversion curl \
-  autoconf bison build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev libgdbm3 libgdbm-dev locales \
-  openjdk-8-jre
+  autoconf bison build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev libgdbm6 libgdbm-dev locales \
+  openjdk-11-jre
 
 # Set the locale.
 RUN locale-gen en_US.UTF-8
@@ -19,12 +19,11 @@ ENV LC_ALL en_US.UTF-8
 WORKDIR /root
 
 # Install rbenv/ruby-build
-RUN git clone git://github.com/sstephenson/rbenv.git .rbenv
+RUN git clone https://github.com/rbenv/rbenv.git .rbenv
 ENV PATH /root/.rbenv/bin:/root/.rbenv/shims:$PATH
 RUN echo 'eval "$(rbenv init -)"' > /etc/profile.d/rbenv.sh
 RUN chmod +x /etc/profile.d/rbenv.sh
-RUN git clone git://github.com/sstephenson/ruby-build.git #.rbenv/plugins/ruby-build
-RUN cd ruby-build; ./install.sh
+RUN git clone https://github.com/rbenv/ruby-build.git "$(rbenv root)"/plugins/ruby-build && cd "$(rbenv root)"/plugins/ruby-build && git checkout 9ae5198
 RUN git clone https://github.com/rbenv/rbenv-vars.git $(rbenv root)/plugins/rbenv-vars
 
 # Copy in secret files
@@ -34,7 +33,7 @@ RUN git clone https://github.com/rbenv/rbenv-vars.git $(rbenv root)/plugins/rben
 
 ADD . /root/sosol/
 WORKDIR /root/sosol
-RUN rbenv install && rbenv rehash && gem install bundler:2.2.10 && rbenv rehash && bundle install && jruby -v && java -version && touch config/environments/development_secret.rb config/environments/production_secret.rb config/environments/test_secret.rb
+RUN rbenv install && rbenv rehash && gem install bundler:2.2.28 && rbenv rehash && bundle install && jruby -v && java -version && touch config/environments/development_secret.rb config/environments/production_secret.rb config/environments/test_secret.rb
 RUN RAILS_ENV=test ./script/setup
 
 # Finally, start the application
diff --git a/config/externals.yml b/config/externals.yml
index 044e555b5..eb3d8c3e5 100644
--- a/config/externals.yml
+++ b/config/externals.yml
@@ -1,14 +1,14 @@
 lib/rxsugar:
   :type: git
-  :repository: git://github.com/papyri/xsugar.git
+  :repository: https://github.com/papyri/xsugar.git
   :revision: master
 
 data/xslt/epidoc:
   :type: git
-  :repository: git://github.com/DCLP/epidoc-xslt.git
-  :revision: 97e957091d135ec6f8f169c13bdc8e279f26f00b
+  :repository: https://github.com/EpiDoc/Stylesheets.git
+  :revision: 06062b8c98b421a4c34421e66491b62b88715f9a
 
 data/xslt/pn/navigator:
   :type: git
-  :repository: git://github.com/DCLP/navigator.git
-  :revision: f6d9bb08e524f3291fcddbbf4e108e55151ae035
+  :repository: https://github.com/papyri/navigator.git
+  :revision: 50a8d888f2c03701a4216cb1a2c3890bf3de89b1
diff --git a/lib/tasks/git.rake b/lib/tasks/git.rake
index 19e546fd0..50694908a 100644
--- a/lib/tasks/git.rake
+++ b/lib/tasks/git.rake
@@ -19,9 +19,9 @@ namespace :git do
         require File.expand_path('../../../config/boot', __FILE__)
         
         if ENV['RAILS_ENV'] == "test"
-          CANONICAL_CLONE_URL = "git://github.com/ryanfb/idp.data.test.git"
+          CANONICAL_CLONE_URL = "https://github.com/ryanfb/idp.data.test.git"
         else
-          CANONICAL_CLONE_URL = "git://github.com/papyri/idp.data.git"
+          CANONICAL_CLONE_URL = "https://github.com/papyri/idp.data.git"
         end
         
         if !File.exist?(Sosol::Application.config.canonical_repository)