diff --git a/2019/ruby/Gemfile b/2019/ruby/Gemfile
index e03b97c..88bd7be 100644
--- a/2019/ruby/Gemfile
+++ b/2019/ruby/Gemfile
@@ -5,3 +5,4 @@ source "https://rubygems.org"
 git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
 
 gem "minitest"
+gem "pry"
diff --git a/2019/ruby/Gemfile.lock b/2019/ruby/Gemfile.lock
index 5846597..7990e3d 100644
--- a/2019/ruby/Gemfile.lock
+++ b/2019/ruby/Gemfile.lock
@@ -1,13 +1,19 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    coderay (1.1.2)
+    method_source (0.9.2)
     minitest (5.13.0)
+    pry (0.12.2)
+      coderay (~> 1.1.0)
+      method_source (~> 0.9.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   minitest
+  pry
 
 BUNDLED WITH
-   2.0.2
+   2.1.0.pre.3