diff --git a/lib/doc_key.rb b/lib/doc_key.rb
index f535e9b..0c1863d 100644
--- a/lib/doc_key.rb
+++ b/lib/doc_key.rb
@@ -1,4 +1,4 @@
-require 'digest'
+require 'digest/md5'
 
 module Colore
   # This is the unique identifier for a document, a composite of
diff --git a/lib/legacy_converter.rb b/lib/legacy_converter.rb
index 8c7101d..6a42ba8 100644
--- a/lib/legacy_converter.rb
+++ b/lib/legacy_converter.rb
@@ -2,6 +2,7 @@
 require 'filemagic/ext'
 require 'mime/types'
 require 'heathen'
+require 'digest/sha2'
 
 module Colore
   # The Colore Legacy Converter provides the conversion functionality from
diff --git a/lib/utils.rb b/lib/utils.rb
index 15d44c5..85381b9 100644
--- a/lib/utils.rb
+++ b/lib/utils.rb
@@ -1,5 +1,3 @@
-require 'digest'
-
 module Colore
   module Utils
     # Deep conversion of all hash keys to symbols.