diff --git a/Gemfile.lock b/Gemfile.lock
index fb1f12c..a2d6f20 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,6 +9,14 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
+    columnize (0.3.6)
+    debugger (1.3.0)
+      columnize (>= 0.3.1)
+      debugger-linecache (~> 1.1.1)
+      debugger-ruby_core_source (~> 1.1.7)
+    debugger-linecache (1.1.2)
+      debugger-ruby_core_source (>= 1.1.1)
+    debugger-ruby_core_source (1.1.7)
     execjs (1.4.0)
       multi_json (~> 1.0)
     haml (3.1.6)
@@ -30,6 +38,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  debugger
   haml
   hogan_assets!
   slim
diff --git a/hogan_assets.gemspec b/hogan_assets.gemspec
index d36053d..12fcca3 100644
--- a/hogan_assets.gemspec
+++ b/hogan_assets.gemspec
@@ -19,6 +19,7 @@ Gem::Specification.new do |gem|
   gem.add_runtime_dependency "tilt", ">= 1.3.3"
   gem.add_runtime_dependency "sprockets", ">= 2.0.3"
 
+  gem.add_development_dependency "debugger"
   gem.add_development_dependency "haml"
   gem.add_development_dependency "slim"
 end