diff --git a/.gitignore b/.gitignore
index a8b42eb..277fe83 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 *.retry
+Gemfile.lock
diff --git a/Gemfile b/Gemfile
new file mode 100644
index 0000000..af61a73
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,6 @@
+source 'https://rubygems.org'
+# Install Twitter CLI https://github.com/sferik/t
+gem 't'
+gem 'asciidoctor-pdf'
+#Previously installed using
+#sudo gem install -n /usr/local/bin asciidoctor-pdf --pre
diff --git a/dot_scripts/bootstrap.sh b/dot_scripts/bootstrap.sh
index 0161c67..73eef55 100755
--- a/dot_scripts/bootstrap.sh
+++ b/dot_scripts/bootstrap.sh
@@ -10,8 +10,8 @@ sdk install java 8.0.202-zulu
 # Install dependencies (apps, fonts, ...) with Brew
 brew bundle
 
-# Install asciidoctor-pdf
-sudo gem install -n /usr/local/bin asciidoctor-pdf --pre
+# Install bundler for managing ruby dependencies and Gemfile
+sudo gem install bundler
 
 # Install Oh My Zsh and some cool dependencies
 sh -c "$(curl -fsSL https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"
diff --git a/dot_scripts/upgrade.sh b/dot_scripts/upgrade.sh
index eef53ed..35af66b 100644
--- a/dot_scripts/upgrade.sh
+++ b/dot_scripts/upgrade.sh
@@ -3,8 +3,9 @@ brew update
 #brew upgrade
 brew outdated | xargs brew upgrade
 
-gem update --system
-gem update asciidoctor-pdf
+bundle update --all
+#gem update --system
+#gem update asciidoctor-pdf t
 upgrade_oh_my_zsh
 npm update -g jira-node-cli --save
 sudo pip install --upgrade pip