diff --git a/lib/datasets/configuration.rb b/lib/datasets/configuration.rb
index c32addd..fe7a77c 100644
--- a/lib/datasets/configuration.rb
+++ b/lib/datasets/configuration.rb
@@ -5,7 +5,7 @@
 module Datasets
   class Configuration < OpenStruct
     def initialize(hash = {})
-      super hash.merge(logger: NullLogger.new)
+      super(hash.merge(logger: NullLogger.new))
     end
 
     def self.from_yaml(path)
diff --git a/lib/datasets/filter.rb b/lib/datasets/filter.rb
index 6e55713..3370add 100644
--- a/lib/datasets/filter.rb
+++ b/lib/datasets/filter.rb
@@ -1,6 +1,4 @@
 # Filters volumes based on criteria.
-require "set"
-
 module Datasets
   class Filter
     PD_RIGHTS = [:"cc-by-3.0",
diff --git a/lib/datasets/repository/rights_volume_repo.rb b/lib/datasets/repository/rights_volume_repo.rb
index 3a44df3..16454b7 100644
--- a/lib/datasets/repository/rights_volume_repo.rb
+++ b/lib/datasets/repository/rights_volume_repo.rb
@@ -1,6 +1,5 @@
 require "datasets/volume_repo"
 require "datasets/volume"
-require "set"
 require "sequel"
 
 module Datasets
diff --git a/spec/cli_spec.rb b/spec/cli_spec.rb
index bd20247..29c3a83 100644
--- a/spec/cli_spec.rb
+++ b/spec/cli_spec.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require_relative "./spec_helper"
+require_relative "spec_helper"
 require "cli"
 
 module Datasets
diff --git a/spec/filesystem_spec.rb b/spec/filesystem_spec.rb
index 17de8aa..62165a3 100644
--- a/spec/filesystem_spec.rb
+++ b/spec/filesystem_spec.rb
@@ -1,4 +1,4 @@
-require_relative "./spec_helper"
+require_relative "spec_helper"
 require "filesystem"
 require "pathname"
 require "fileutils"
diff --git a/spec/force_volume_creator_spec.rb b/spec/force_volume_creator_spec.rb
index 2208b2a..1fb0683 100644
--- a/spec/force_volume_creator_spec.rb
+++ b/spec/force_volume_creator_spec.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require_relative "./spec_helper"
+require_relative "spec_helper"
 require "force_volume_creator"
 require "pathname"
 
diff --git a/spec/pairtree_path_resolver_spec.rb b/spec/pairtree_path_resolver_spec.rb
index ced601a..3431957 100644
--- a/spec/pairtree_path_resolver_spec.rb
+++ b/spec/pairtree_path_resolver_spec.rb
@@ -1,4 +1,4 @@
-require_relative "./spec_helper"
+require_relative "spec_helper"
 require "pairtree_path_resolver"
 
 module Datasets
diff --git a/spec/report_manager_spec.rb b/spec/report_manager_spec.rb
index fb5b418..10b0c9c 100644
--- a/spec/report_manager_spec.rb
+++ b/spec/report_manager_spec.rb
@@ -1,4 +1,4 @@
-require_relative "./spec_helper"
+require_relative "spec_helper"
 require "report_manager"
 require "filesystem"
 require "pathname"
diff --git a/spec/report_spec.rb b/spec/report_spec.rb
index 86767a3..1096516 100644
--- a/spec/report_spec.rb
+++ b/spec/report_spec.rb
@@ -1,4 +1,4 @@
-require_relative "./spec_helper"
+require_relative "spec_helper"
 require "report"
 require "report_summary"
 require "pathname"
diff --git a/spec/report_summary_spec.rb b/spec/report_summary_spec.rb
index 616fb14..5aa201b 100644
--- a/spec/report_summary_spec.rb
+++ b/spec/report_summary_spec.rb
@@ -1,4 +1,4 @@
-require_relative "./spec_helper"
+require_relative "spec_helper"
 require "report_summary"
 
 module Datasets
diff --git a/spec/repository/rights_volume_repo_spec.rb b/spec/repository/rights_volume_repo_spec.rb
index 3b11584..e245981 100644
--- a/spec/repository/rights_volume_repo_spec.rb
+++ b/spec/repository/rights_volume_repo_spec.rb
@@ -1,7 +1,6 @@
 require "spec_helper"
 require "repository/rights_volume_repo"
 require "volume"
-require "set"
 require "sequel"
 
 module Datasets
diff --git a/spec/scheduler_spec.rb b/spec/scheduler_spec.rb
index 8215dba..63323c2 100644
--- a/spec/scheduler_spec.rb
+++ b/spec/scheduler_spec.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require_relative "./spec_helper"
+require_relative "spec_helper"
 require "scheduler"
 
 module Datasets
diff --git a/spec/volume_creator_spec.rb b/spec/volume_creator_spec.rb
index 44873ab..5a1ec51 100644
--- a/spec/volume_creator_spec.rb
+++ b/spec/volume_creator_spec.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require_relative "./spec_helper"
+require_relative "spec_helper"
 require "volume_creator"
 require "pathname"
 
diff --git a/spec/volume_linker_spec.rb b/spec/volume_linker_spec.rb
index 0d86ffc..b1c5d5c 100644
--- a/spec/volume_linker_spec.rb
+++ b/spec/volume_linker_spec.rb
@@ -1,4 +1,4 @@
-require_relative "./spec_helper"
+require_relative "spec_helper"
 require "volume_linker"
 require "pathname"
 
diff --git a/spec/volume_spec.rb b/spec/volume_spec.rb
index e19d3aa..1cebdc3 100644
--- a/spec/volume_spec.rb
+++ b/spec/volume_spec.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require_relative "./spec_helper"
+require_relative "spec_helper"
 require "datasets/volume"
 
 module Datasets
diff --git a/spec/zip_writer_spec.rb b/spec/zip_writer_spec.rb
index 0a26eb8..089a402 100644
--- a/spec/zip_writer_spec.rb
+++ b/spec/zip_writer_spec.rb
@@ -1,4 +1,4 @@
-require_relative "./spec_helper"
+require_relative "spec_helper"
 require "zip_writer"
 require "zip"
 require "pathname"