diff --git a/Gemfile.lock b/Gemfile.lock
index 5387b6b..3f81d38 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,6 +3,7 @@ PATH
   specs:
     postgres-copy (1.7.1)
       activerecord (>= 5.1)
+      csv
       pg (>= 0.17)
 
 GEM
@@ -19,6 +20,7 @@ GEM
       minitest (>= 5.1)
       tzinfo (~> 2.0)
     concurrent-ruby (1.1.10)
+    csv (3.3.0)
     diff-lcs (1.5.0)
     i18n (1.12.0)
       concurrent-ruby (~> 1.0)
diff --git a/postgres-copy.gemspec b/postgres-copy.gemspec
index 3e7281d..cd347a3 100644
--- a/postgres-copy.gemspec
+++ b/postgres-copy.gemspec
@@ -22,6 +22,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency "pg", ">= 0.17"
   s.add_dependency "activerecord", '>= 5.1'
+  s.add_dependency "csv"
   s.add_development_dependency "bundler"
   s.add_development_dependency "rdoc"
   s.add_development_dependency "rspec", "~> 3.0"