diff --git a/WcaOnRails/Gemfile b/WcaOnRails/Gemfile
index cc94cb4cef..5fdadac9e9 100644
--- a/WcaOnRails/Gemfile
+++ b/WcaOnRails/Gemfile
@@ -105,6 +105,11 @@ group :development, :test do
   gem 'byebug'
   gem 'i18n-tasks'
   gem 'i18n-spec'
+
+  # We may be able to remove this when a future version of bundler comes out.
+  # See https://github.com/bundler/bundler/issues/6929#issuecomment-459151506 and
+  # https://github.com/bundler/bundler/pull/6963 for more information.
+  gem 'irb', require: false
 end
 
 group :development do
diff --git a/WcaOnRails/Gemfile.lock b/WcaOnRails/Gemfile.lock
index 072de48c5d..6a15d6a3a1 100644
--- a/WcaOnRails/Gemfile.lock
+++ b/WcaOnRails/Gemfile.lock
@@ -273,6 +273,7 @@ GEM
     image_processing (1.9.0)
       mini_magick (>= 4.9.3, < 5)
       ruby-vips (>= 2.0.13, < 3)
+    irb (1.0.0)
     iso (0.2.2)
       i18n
     jaro_winkler (1.5.3)
@@ -649,6 +650,7 @@ DEPENDENCIES
   i18n-spec
   i18n-tasks
   image_processing
+  irb
   jbuilder
   jquery-rails
   jquery-slick-rails
@@ -708,4 +710,4 @@ DEPENDENCIES
   wicked_pdf
 
 BUNDLED WITH
-   2.0.1
+   2.0.2