diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 186063b77..96f12e287 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -63,6 +63,8 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
+      - name: Install missing libs (Temporary regression in GH Action?)
+        run: sudo apt update && sudo apt-get -yqq install build-essential ruby-dev
       - name: Update .ruby-version with matrix value
         run: echo "${{ matrix.ruby }}" >| .ruby-version
 
diff --git a/.rubocop.yml b/.rubocop.yml
index 20d908e5a..24ed3de17 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -99,6 +99,10 @@ Style/EmptyMethod:
 Style/FormatStringToken:
   EnforcedStyle: template
 
+Style/FrozenStringLiteralComment:
+  Exclude:
+    - gemfiles/*.gemfile
+
 Style/MultilineBlockChain:
   Enabled: false
 
diff --git a/Appraisals b/Appraisals
index 4ba8b57c9..214907d34 100644
--- a/Appraisals
+++ b/Appraisals
@@ -20,6 +20,11 @@ end
 if ruby_27_or_higher && !jruby
   # Rails HEAD requires MRI 2.7+
   # activerecord-jdbcpostgresql-adapter does not have a compatible version
+
+  appraise "rails-7.0" do
+    gem "rails", "~> 7.0.0.alpha"
+  end
+
   appraise "rails-head" do
     gem "rails", github: "rails/rails", branch: "main"
   end
diff --git a/Gemfile b/Gemfile
index 8b42144f6..260562176 100644
--- a/Gemfile
+++ b/Gemfile
@@ -15,6 +15,7 @@ gemspec
 gem 'activerecord-jdbcpostgresql-adapter', platforms: [:jruby]
 gem 'appraisal', github: "bensheldon/appraisal", branch: "fix-bundle-env" # https://github.com/thoughtbot/appraisal/pull/174
 gem 'pg', platforms: [:mri, :mingw, :x64_mingw]
+gem 'puma', '5.4.0'
 gem 'rails'
 
 platforms :ruby do
diff --git a/Gemfile.lock b/Gemfile.lock
index a591ece2f..2385f881f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -130,8 +130,7 @@ GEM
       rack-test (>= 0.6.3)
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
-    chef-utils (17.4.38)
-      concurrent-ruby
+    chef-utils (16.6.14)
     childprocess (3.0.0)
     coderay (1.1.3)
     concurrent-ruby (1.1.9)
@@ -155,9 +154,9 @@ GEM
       rubocop
       smart_properties
     erubi (1.10.0)
-    et-orbi (1.2.4)
+    et-orbi (1.2.5)
       tzinfo
-    faraday (1.7.1)
+    faraday (1.8.0)
       faraday-em_http (~> 1.0)
       faraday-em_synchrony (~> 1.0)
       faraday-excon (~> 1.1)
@@ -178,11 +177,11 @@ GEM
     faraday-net_http_persistent (1.2.0)
     faraday-patron (1.0.0)
     faraday-rack (1.0.0)
-    ffi (1.15.3)
-    ffi (1.15.3-java)
+    ffi (1.15.4)
+    ffi (1.15.4-java)
     fiber-local (1.0.0)
     foreman (0.87.2)
-    fugit (1.5.1)
+    fugit (1.5.2)
       et-orbi (~> 1.1, >= 1.1.8)
       raabro (~> 1.4)
     gem-release (2.2.2)
@@ -210,7 +209,7 @@ GEM
       nokogiri (>= 1.5.9)
     mail (2.7.1)
       mini_mime (>= 0.1.1)
-    marcel (1.0.1)
+    marcel (1.0.2)
     mdl (0.11.0)
       kramdown (~> 2.3)
       kramdown-parser-gfm (~> 1.1)
@@ -228,6 +227,7 @@ GEM
     mixlib-shellout (3.2.5)
       chef-utils
     msgpack (1.4.2)
+    msgpack (1.4.2-java)
     multi_json (1.15.0)
     multipart-post (2.1.1)
     nio4r (2.5.8)
@@ -241,7 +241,7 @@ GEM
       faraday (>= 0.9)
       sawyer (~> 0.8.0, >= 0.5.3)
     optimist (3.0.1)
-    parallel (1.20.1)
+    parallel (1.21.0)
     parser (3.0.2.0)
       ast (~> 2.4.1)
     pg (1.2.3)
@@ -326,7 +326,7 @@ GEM
       rspec-mocks (~> 3.10)
       rspec-support (~> 3.10)
     rspec-support (3.10.2)
-    rubocop (1.20.0)
+    rubocop (1.21.0)
       parallel (~> 1.10)
       parser (>= 3.0.0.0)
       rainbow (>= 2.2.2, < 4.0)
@@ -340,7 +340,7 @@ GEM
     rubocop-performance (1.11.5)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)
-    rubocop-rails (2.11.3)
+    rubocop-rails (2.12.2)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.7.0, < 2.0)
@@ -357,7 +357,7 @@ GEM
       childprocess (>= 0.5, < 4.0)
       rubyzip (>= 1.2.2)
     sigdump (0.2.4)
-    smart_properties (1.16.0)
+    smart_properties (1.16.3)
     spoon (0.0.6)
       ffi
     sprockets (4.0.2)
@@ -372,7 +372,7 @@ GEM
     tomlrb (2.0.1)
     tzinfo (2.0.4)
       concurrent-ruby (~> 1.0)
-    unicode-display_width (2.0.0)
+    unicode-display_width (2.1.0)
     websocket-driver (0.7.5)
       websocket-extensions (>= 0.1.0)
     websocket-driver (0.7.5-java)
@@ -410,7 +410,7 @@ DEPENDENCIES
   pg
   pry-byebug
   pry-rails
-  puma
+  puma (= 5.4.0)
   rails
   rbtrace
   rspec-rails
diff --git a/gemfiles/rails_5.2.gemfile b/gemfiles/rails_5.2.gemfile
index 5e2d4786d..38562cf64 100644
--- a/gemfiles/rails_5.2.gemfile
+++ b/gemfiles/rails_5.2.gemfile
@@ -1,4 +1,3 @@
-# frozen_string_literal: true
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
@@ -6,6 +5,7 @@ source "https://rubygems.org"
 gem "activerecord-jdbcpostgresql-adapter", platforms: [:jruby]
 gem "appraisal", branch: "fix-bundle-env", git: "https://github.com/bensheldon/appraisal.git"
 gem "pg", platforms: [:mri, :mingw, :x64_mingw]
+gem "puma", "5.4.0"
 gem "rails", "~> 5.2.0"
 
 platforms :ruby do
diff --git a/gemfiles/rails_6.0.gemfile b/gemfiles/rails_6.0.gemfile
index 3d1d9cf37..7d547816d 100644
--- a/gemfiles/rails_6.0.gemfile
+++ b/gemfiles/rails_6.0.gemfile
@@ -1,4 +1,3 @@
-# frozen_string_literal: true
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
@@ -6,6 +5,7 @@ source "https://rubygems.org"
 gem "activerecord-jdbcpostgresql-adapter", platforms: [:jruby]
 gem "appraisal", branch: "fix-bundle-env", git: "https://github.com/bensheldon/appraisal.git"
 gem "pg", platforms: [:mri, :mingw, :x64_mingw]
+gem "puma", "5.4.0"
 gem "rails", "~> 6.0.0"
 
 platforms :ruby do
diff --git a/gemfiles/rails_6.1.gemfile b/gemfiles/rails_6.1.gemfile
index d2ee92b98..496166712 100644
--- a/gemfiles/rails_6.1.gemfile
+++ b/gemfiles/rails_6.1.gemfile
@@ -1,4 +1,3 @@
-# frozen_string_literal: true
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
@@ -6,6 +5,7 @@ source "https://rubygems.org"
 gem "activerecord-jdbcpostgresql-adapter", platforms: [:jruby]
 gem "appraisal", branch: "fix-bundle-env", git: "https://github.com/bensheldon/appraisal.git"
 gem "pg", platforms: [:mri, :mingw, :x64_mingw]
+gem "puma", "5.4.0"
 gem "rails", "~> 6.1.0"
 
 platforms :ruby do
diff --git a/gemfiles/rails_7.0.gemfile b/gemfiles/rails_7.0.gemfile
new file mode 100644
index 000000000..2dfcad498
--- /dev/null
+++ b/gemfiles/rails_7.0.gemfile
@@ -0,0 +1,27 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "activerecord-jdbcpostgresql-adapter", platforms: [:jruby]
+gem "appraisal", branch: "fix-bundle-env", git: "https://github.com/bensheldon/appraisal.git"
+gem "pg", platforms: [:mri, :mingw, :x64_mingw]
+gem "puma", "5.4.0"
+gem "rails", "~> 7.0.0.alpha"
+
+platforms :ruby do
+  gem "activerecord-explain-analyze"
+  gem "memory_profiler"
+  gem "pry-byebug"
+  gem "rbtrace"
+
+  group :lint do
+    gem "erb_lint", ">= 0.0.35"
+    gem "mdl"
+    gem "rubocop"
+    gem "rubocop-performance"
+    gem "rubocop-rails"
+    gem "rubocop-rspec"
+  end
+end
+
+gemspec path: "../"
diff --git a/gemfiles/rails_head.gemfile b/gemfiles/rails_head.gemfile
index db94e34ec..386eca50a 100644
--- a/gemfiles/rails_head.gemfile
+++ b/gemfiles/rails_head.gemfile
@@ -1,4 +1,3 @@
-# frozen_string_literal: true
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
@@ -6,6 +5,7 @@ source "https://rubygems.org"
 gem "activerecord-jdbcpostgresql-adapter", platforms: [:jruby]
 gem "appraisal", branch: "fix-bundle-env", git: "https://github.com/bensheldon/appraisal.git"
 gem "pg", platforms: [:mri, :mingw, :x64_mingw]
+gem "puma", "5.4.0"
 gem "rails", branch: "main", git: "https://github.com/rails/rails.git"
 
 platforms :ruby do
diff --git a/lib/good_job/adapter.rb b/lib/good_job/adapter.rb
index 9217deb6c..230059b26 100644
--- a/lib/good_job/adapter.rb
+++ b/lib/good_job/adapter.rb
@@ -101,14 +101,14 @@ def shutdown(timeout: :default)
     # @return [Boolean]
     def execute_async?
       @configuration.execution_mode == :async_all ||
-        @configuration.execution_mode.in?([:async, :async_server]) && in_server_process?
+        (@configuration.execution_mode.in?([:async, :async_server]) && in_server_process?)
     end
 
     # Whether in +:external+ execution mode.
     # @return [Boolean]
     def execute_externally?
       @configuration.execution_mode == :external ||
-        @configuration.execution_mode.in?([:async, :async_server]) && !in_server_process?
+        (@configuration.execution_mode.in?([:async, :async_server]) && !in_server_process?)
     end
 
     # Whether in +:inline+ execution mode.