diff --git a/Dockerfile b/Dockerfile
index 06f73579dbea1e..e85d135a07f583 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -37,6 +37,7 @@ RUN apt-get update && \
         libgdbm-dev \
         libgmp-dev \
         libssl-dev \
+        libyaml-dev \
         libyaml-0-2 \
         ca-certificates \
         libreadline8 \
diff --git a/Gemfile b/Gemfile
index f5b43934a9525d..88dfc0b371bd7b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -159,3 +159,5 @@ gem 'connection_pool', require: false
 gem 'xorcist', '~> 1.1'
 gem 'cocoon', '~> 1.2'
 gem 'mail', '~> 2.8'
+
+gem 'debug', '~> 1.9'
diff --git a/Gemfile.lock b/Gemfile.lock
index 80d8f7f27272d9..a880c5f631a278 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -185,6 +185,9 @@ GEM
     css_parser (1.12.0)
       addressable
     date (3.3.4)
+    debug (1.9.2)
+      irb (~> 1.10)
+      reline (>= 0.3.8)
     debug_inspector (1.0.0)
     devise (4.8.1)
       bcrypt (~> 3.0)
@@ -327,7 +330,11 @@ GEM
       rainbow (>= 2.2.2, < 4.0)
       terminal-table (>= 1.5.1)
     idn-ruby (0.1.5)
+    io-console (0.7.2)
     ipaddress (0.8.3)
+    irb (1.14.0)
+      rdoc (>= 4.0.0)
+      reline (>= 0.4.2)
     jmespath (1.6.2)
     json (2.6.3)
     json-canonicalization (0.3.0)
@@ -491,6 +498,8 @@ GEM
       pry (>= 0.13, < 0.15)
     pry-rails (0.3.9)
       pry (>= 0.10.4)
+    psych (5.1.2)
+      stringio
     public_suffix (5.0.1)
     puma (5.6.8)
       nio4r (~> 2.0)
@@ -554,6 +563,8 @@ GEM
       link_header (~> 0.0, >= 0.0.8)
     rdf-normalize (0.5.1)
       rdf (~> 3.2)
+    rdoc (6.7.0)
+      psych (>= 4.0.0)
     redcarpet (3.6.0)
     redis (4.5.1)
     redis-namespace (1.10.0)
@@ -561,6 +572,8 @@ GEM
     redlock (1.3.2)
       redis (>= 3.0.0, < 6.0)
     regexp_parser (2.6.2)
+    reline (0.5.10)
+      io-console (~> 0.5)
     request_store (1.5.1)
       rack (>= 1.4)
     responders (3.0.1)
@@ -680,6 +693,7 @@ GEM
     statsd-ruby (1.5.0)
     stoplight (3.0.1)
       redlock (~> 1.0)
+    stringio (3.1.1)
     strong_migrations (0.7.9)
       activerecord (>= 5)
     strscan (3.1.0)
@@ -788,6 +802,7 @@ DEPENDENCIES
   color_diff (~> 0.1)
   concurrent-ruby
   connection_pool
+  debug (~> 1.9)
   devise (~> 4.8)
   devise-two-factor (~> 4.0)
   devise_pam_authenticatable2 (~> 9.2)