diff --git a/Gemfile.lock b/Gemfile.lock
index ffbc483..4383c12 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,6 @@ PATH
   remote: .
   specs:
     code_manifest (1.9.0)
-      psych (>= 4.0.0)
 
 GEM
   remote: https://rubygems.org/
diff --git a/code_manifest.gemspec b/code_manifest.gemspec
index 004c6d0..30c0df6 100644
--- a/code_manifest.gemspec
+++ b/code_manifest.gemspec
@@ -19,8 +19,6 @@ Gem::Specification.new do |spec|
 
   spec.files = Dir["README.md", "lib/**/*"]
 
-  spec.add_dependency "psych", ">= 4.0.0"
-
   spec.add_development_dependency 'rspec'
   spec.add_development_dependency 'debug'
 end