3 files changed, 4 insertions, 4 deletions
diff --git a/Gemfile b/Gemfile
index a5b7655..a1c1772 100644
--- a/Gemfile
+++ b/Gemfile
@@ -17,6 +17,6 @@ end
 group :debug do
   gem "pry"
   gem "pry-byebug"
-  gem "pry-stack_explorer"
+  gem "pry-stack_explorer", "~> 0.4.0" # pin until we drop ruby < 2.6
   gem "rb-readline"
 end
diff --git a/Rakefile b/Rakefile
index bcbe224..1d5a2f5 100644
--- a/Rakefile
+++ b/Rakefile
@@ -24,7 +24,7 @@ rescue LoadError
 end
 
 begin
-  require "yard"
+  require "yard" unless defined?(YARD)
   YARD::Rake::YardocTask.new(:docs)
 rescue LoadError
   puts "yard is not available. bundle install first to make sure all dependencies are installed."
@@ -33,7 +33,7 @@ end
 task :console do
   require "irb"
   require "irb/completion"
-  require "mixlib/cli"
+  require "mixlib/cli" unless defined?(Mixlib::CLI)
   ARGV.clear
   IRB.start
 end
diff --git a/lib/mixlib/cli.rb b/lib/mixlib/cli.rb
index 30efbd3..f69eb04 100644
--- a/lib/mixlib/cli.rb
+++ b/lib/mixlib/cli.rb
@@ -16,7 +16,7 @@
 # limitations under the License.
 #
 
-require "optparse"
+require "optparse" unless defined?(OptionParser)
 require_relative "cli/formatter"
 module Mixlib