diff --git a/.github/workflows/rspec.yml b/.github/workflows/rspec.yml
index f94610f..6eca420 100644
--- a/.github/workflows/rspec.yml
+++ b/.github/workflows/rspec.yml
@@ -21,6 +21,7 @@ jobs:
           - "3.0"
           - "3.1"
           - "3.2"
+          - "3.3"
           - "head"
           - "jruby-9.3"
     runs-on: ${{ matrix.os }}-latest
diff --git a/gemfiles/rails_6.1.gemfile b/gemfiles/rails_6.1.gemfile
index 6214df6..20b98dc 100644
--- a/gemfiles/rails_6.1.gemfile
+++ b/gemfiles/rails_6.1.gemfile
@@ -3,7 +3,14 @@
 source "https://rubygems.org"
 
 gem "activerecord-jdbcsqlite3-adapter", "~> 61.0", platform: :jruby
+gem "appraisal", git: "https://github.com/thoughtbot/appraisal.git", branch: :main
+gem "fakefs", "~> 1.2"
+gem "nokogiri", "~> 1.10"
+gem "pry"
 gem "rails", "~> 6.1.0"
+gem "rspec", "~> 3.9"
+gem "rubocop", "~> 1.20"
+gem "rubocop-rspec", "~> 2.4"
 gem "sqlite3", platform: :mri
 
 gemspec path: "../"
diff --git a/gemfiles/rails_7.0.gemfile b/gemfiles/rails_7.0.gemfile
index 9f381de..0a19ff3 100644
--- a/gemfiles/rails_7.0.gemfile
+++ b/gemfiles/rails_7.0.gemfile
@@ -3,7 +3,14 @@
 source "https://rubygems.org"
 
 gem "activerecord-jdbcsqlite3-adapter", "~> 70.0", platform: :jruby
+gem "appraisal", git: "https://github.com/thoughtbot/appraisal.git", branch: :main
+gem "fakefs", "~> 1.2"
+gem "nokogiri", "~> 1.10"
+gem "pry"
 gem "rails", "~> 7.0.0"
+gem "rspec", "~> 3.9"
+gem "rubocop", "~> 1.20"
+gem "rubocop-rspec", "~> 2.4"
 gem "sqlite3", platform: :mri
 
 gemspec path: "../"
diff --git a/gemfiles/sequel_5.0.gemfile b/gemfiles/sequel_5.0.gemfile
index b101639..ba937c3 100644
--- a/gemfiles/sequel_5.0.gemfile
+++ b/gemfiles/sequel_5.0.gemfile
@@ -2,7 +2,14 @@
 
 source "https://rubygems.org"
 
+gem "appraisal", git: "https://github.com/thoughtbot/appraisal.git", branch: :main
+gem "fakefs", "~> 1.2"
 gem "jdbc-sqlite3", platform: :jruby
+gem "nokogiri", "~> 1.10"
+gem "pry"
+gem "rspec", "~> 3.9"
+gem "rubocop", "~> 1.20"
+gem "rubocop-rspec", "~> 2.4"
 gem "sequel", "~> 5.0"
 gem "sqlite3", platform: :mri
 
diff --git a/lib/amazing_print/core_ext/awesome_method_array.rb b/lib/amazing_print/core_ext/awesome_method_array.rb
index 8a6204a..96654ef 100644
--- a/lib/amazing_print/core_ext/awesome_method_array.rb
+++ b/lib/amazing_print/core_ext/awesome_method_array.rb
@@ -78,7 +78,7 @@ def grep(pattern, &blk)
             super(pattern)
           end
     arr.instance_variable_set(:@__awesome_methods__, instance_variable_get(:@__awesome_methods__))
-    arr.select! { |item| (item.is_a?(Symbol) || item.is_a?(String)) } # grep block might return crap.
+    arr.select! { |item| item.is_a?(Symbol) || item.is_a?(String) } # grep block might return crap.
     arr
   end
 end