diff --git a/app/helpers/dmsf_helper.rb b/app/helpers/dmsf_helper.rb
index 83119e7a..c2563268 100644
--- a/app/helpers/dmsf_helper.rb
+++ b/app/helpers/dmsf_helper.rb
@@ -21,7 +21,6 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 require 'tmpdir'
-require 'digest'
 require 'csv'
 
 module DmsfHelper
diff --git a/app/models/dmsf_file_revision.rb b/app/models/dmsf_file_revision.rb
index 35ae0839..27de6885 100644
--- a/app/models/dmsf_file_revision.rb
+++ b/app/models/dmsf_file_revision.rb
@@ -20,8 +20,6 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-require 'digest'
-
 class DmsfFileRevision < ActiveRecord::Base
 
   belongs_to :dmsf_file
diff --git a/lib/dav4rack.rb b/lib/dav4rack.rb
index 44024c74..06016caf 100644
--- a/lib/dav4rack.rb
+++ b/lib/dav4rack.rb
@@ -25,8 +25,9 @@ require 'time'
 require 'uri'
 require 'nokogiri'
 require 'ox'
-
+require 'digest'
 require 'rack'
+
 require File.dirname(__FILE__) + '/dav4rack/utils'
 require File.dirname(__FILE__) + '/dav4rack/http_status'
 require File.dirname(__FILE__) + '/dav4rack/resource'
diff --git a/lib/dav4rack/interceptor_resource.rb b/lib/dav4rack/interceptor_resource.rb
index 092cb81e..23dd37ce 100644
--- a/lib/dav4rack/interceptor_resource.rb
+++ b/lib/dav4rack/interceptor_resource.rb
@@ -1,4 +1,3 @@
-require 'digest/sha1'
 
 module Dav4rack
 
diff --git a/lib/dav4rack/remote_file.rb b/lib/dav4rack/remote_file.rb
index 4196515d..b9348b67 100644
--- a/lib/dav4rack/remote_file.rb
+++ b/lib/dav4rack/remote_file.rb
@@ -1,6 +1,5 @@
 require 'net/http'
 require 'uri'
-require 'digest/sha1'
 require 'rack/file'
 
 module Dav4rack
diff --git a/lib/dav4rack/security_utils.rb b/lib/dav4rack/security_utils.rb
index 433d43c1..1d7c7485 100644
--- a/lib/dav4rack/security_utils.rb
+++ b/lib/dav4rack/security_utils.rb
@@ -1,5 +1,3 @@
-require 'digest'
-
 module Dav4rack
 
   # Implements secure string comparison methods.