diff --git a/Appraisals b/Appraisals
index 9d3b5c8a..d81d55ab 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,11 +1,21 @@
 appraise "rails-6.1" do
   gem "rails", "~> 6.1.0"
   gem "sqlite3", "~> 1.4"
+
+  # Ruby 3.4+
+  gem "benchmark"
+  gem "drb"
+  gem "mutex_m"
 end
 
 appraise "rails-7.0" do
   gem "rails", "~> 7.0.0"
   gem "sqlite3", "~> 1.4"
+
+  # Ruby 3.4+
+  gem "benchmark"
+  gem "drb"
+  gem "mutex_m"
 end
 
 appraise "rails-7.1" do
diff --git a/Gemfile b/Gemfile
index 95865afc..4f5422ee 100644
--- a/Gemfile
+++ b/Gemfile
@@ -38,8 +38,3 @@ gem "importmap-rails"
 gem "sprockets-rails"
 gem "stimulus-rails"
 gem "turbo-rails"
-
-# Ruby 3.1+ drops these built-in gems
-gem "net-imap", require: false
-gem "net-pop", require: false
-gem "net-smtp", require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index 4690ac46..dbb975da 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -153,7 +153,6 @@ GEM
     net-protocol (0.2.2)
       timeout
     net-smtp (0.5.0)
-      net-protocol
     nio4r (2.7.4)
     nokogiri (1.18.1)
       mini_portile2 (~> 2.8.2)
@@ -319,9 +318,6 @@ DEPENDENCIES
   lemonsqueezy (~> 1.0)
   mocha
   mysql2
-  net-imap
-  net-pop
-  net-smtp
   paddle (~> 2.6)
   pay!
   pg
diff --git a/gemfiles/rails_6.1.gemfile b/gemfiles/rails_6.1.gemfile
index fc4e2fd1..1afadd36 100644
--- a/gemfiles/rails_6.1.gemfile
+++ b/gemfiles/rails_6.1.gemfile
@@ -22,9 +22,9 @@ gem "importmap-rails"
 gem "sprockets-rails"
 gem "stimulus-rails"
 gem "turbo-rails"
-gem "net-imap", require: false
-gem "net-pop", require: false
-gem "net-smtp", require: false
 gem "rails", "~> 6.1.0"
+gem "benchmark"
+gem "drb"
+gem "mutex_m"
 
 gemspec path: "../"
diff --git a/gemfiles/rails_6.1.gemfile.lock b/gemfiles/rails_6.1.gemfile.lock
index 8af02257..a1ee027e 100644
--- a/gemfiles/rails_6.1.gemfile.lock
+++ b/gemfiles/rails_6.1.gemfile.lock
@@ -74,6 +74,7 @@ GEM
       thor (>= 0.14.0)
     ast (2.4.2)
     base64 (0.2.0)
+    benchmark (0.4.0)
     bigdecimal (3.1.9)
     bindex (0.8.1)
     braintree (4.23.0)
@@ -86,6 +87,7 @@ GEM
       rexml
     crass (1.0.6)
     date (3.4.1)
+    drb (2.2.1)
     erubi (1.13.1)
     faraday (2.12.2)
       faraday-net_http (>= 2.0, < 3.5)
@@ -124,6 +126,7 @@ GEM
     minitest (5.25.4)
     mocha (2.7.1)
       ruby2_keywords (>= 0.0.5)
+    mutex_m (0.3.0)
     mysql2 (0.5.6)
     net-http (0.6.0)
       uri
@@ -283,14 +286,14 @@ PLATFORMS
 
 DEPENDENCIES
   appraisal
+  benchmark
   braintree (>= 2.92.0)
+  drb
   importmap-rails
   lemonsqueezy (~> 1.0)
   mocha
+  mutex_m
   mysql2
-  net-imap
-  net-pop
-  net-smtp
   paddle (~> 2.6)
   pay!
   pg
diff --git a/gemfiles/rails_7.0.gemfile b/gemfiles/rails_7.0.gemfile
index 247a1552..6a38997e 100644
--- a/gemfiles/rails_7.0.gemfile
+++ b/gemfiles/rails_7.0.gemfile
@@ -22,9 +22,9 @@ gem "importmap-rails"
 gem "sprockets-rails"
 gem "stimulus-rails"
 gem "turbo-rails"
-gem "net-imap", require: false
-gem "net-pop", require: false
-gem "net-smtp", require: false
 gem "rails", "~> 7.0.0"
+gem "benchmark"
+gem "drb"
+gem "mutex_m"
 
 gemspec path: "../"
diff --git a/gemfiles/rails_7.0.gemfile.lock b/gemfiles/rails_7.0.gemfile.lock
index dcd7a91c..f4ee7c07 100644
--- a/gemfiles/rails_7.0.gemfile.lock
+++ b/gemfiles/rails_7.0.gemfile.lock
@@ -80,6 +80,7 @@ GEM
       thor (>= 0.14.0)
     ast (2.4.2)
     base64 (0.2.0)
+    benchmark (0.4.0)
     bigdecimal (3.1.9)
     bindex (0.8.1)
     braintree (4.23.0)
@@ -92,6 +93,7 @@ GEM
       rexml
     crass (1.0.6)
     date (3.4.1)
+    drb (2.2.1)
     erubi (1.13.1)
     faraday (2.12.2)
       faraday-net_http (>= 2.0, < 3.5)
@@ -130,6 +132,7 @@ GEM
     minitest (5.25.4)
     mocha (2.7.1)
       ruby2_keywords (>= 0.0.5)
+    mutex_m (0.3.0)
     mysql2 (0.5.6)
     net-http (0.6.0)
       uri
@@ -289,14 +292,14 @@ PLATFORMS
 
 DEPENDENCIES
   appraisal
+  benchmark
   braintree (>= 2.92.0)
+  drb
   importmap-rails
   lemonsqueezy (~> 1.0)
   mocha
+  mutex_m
   mysql2
-  net-imap
-  net-pop
-  net-smtp
   paddle (~> 2.6)
   pay!
   pg
diff --git a/gemfiles/rails_7.1.gemfile b/gemfiles/rails_7.1.gemfile
index 3aca06ad..ebcad83d 100644
--- a/gemfiles/rails_7.1.gemfile
+++ b/gemfiles/rails_7.1.gemfile
@@ -22,9 +22,6 @@ gem "importmap-rails"
 gem "sprockets-rails"
 gem "stimulus-rails"
 gem "turbo-rails"
-gem "net-imap", require: false
-gem "net-pop", require: false
-gem "net-smtp", require: false
 gem "rails", "~> 7.1.0"
 
 gemspec path: "../"
diff --git a/gemfiles/rails_7.1.gemfile.lock b/gemfiles/rails_7.1.gemfile.lock
index b66aaa8a..e26b13bc 100644
--- a/gemfiles/rails_7.1.gemfile.lock
+++ b/gemfiles/rails_7.1.gemfile.lock
@@ -324,9 +324,6 @@ DEPENDENCIES
   lemonsqueezy (~> 1.0)
   mocha
   mysql2
-  net-imap
-  net-pop
-  net-smtp
   paddle (~> 2.6)
   pay!
   pg
diff --git a/gemfiles/rails_7.2.gemfile b/gemfiles/rails_7.2.gemfile
index 621a1eec..f60db1c4 100644
--- a/gemfiles/rails_7.2.gemfile
+++ b/gemfiles/rails_7.2.gemfile
@@ -22,9 +22,6 @@ gem "importmap-rails"
 gem "sprockets-rails"
 gem "stimulus-rails"
 gem "turbo-rails"
-gem "net-imap", require: false
-gem "net-pop", require: false
-gem "net-smtp", require: false
 gem "rails", "~> 7.2.0.rc1"
 
 gemspec path: "../"
diff --git a/gemfiles/rails_7.2.gemfile.lock b/gemfiles/rails_7.2.gemfile.lock
index e42403c7..6b70812d 100644
--- a/gemfiles/rails_7.2.gemfile.lock
+++ b/gemfiles/rails_7.2.gemfile.lock
@@ -321,9 +321,6 @@ DEPENDENCIES
   lemonsqueezy (~> 1.0)
   mocha
   mysql2
-  net-imap
-  net-pop
-  net-smtp
   paddle (~> 2.6)
   pay!
   pg
diff --git a/gemfiles/rails_8.0.gemfile b/gemfiles/rails_8.0.gemfile
index e01c9b90..bacc5ca5 100644
--- a/gemfiles/rails_8.0.gemfile
+++ b/gemfiles/rails_8.0.gemfile
@@ -22,9 +22,6 @@ gem "importmap-rails"
 gem "sprockets-rails"
 gem "stimulus-rails"
 gem "turbo-rails"
-gem "net-imap", require: false
-gem "net-pop", require: false
-gem "net-smtp", require: false
 gem "rails", "~> 8.0.0"
 
 gemspec path: "../"
diff --git a/gemfiles/rails_8.0.gemfile.lock b/gemfiles/rails_8.0.gemfile.lock
index f7a30ec8..9bb8dad1 100644
--- a/gemfiles/rails_8.0.gemfile.lock
+++ b/gemfiles/rails_8.0.gemfile.lock
@@ -347,9 +347,6 @@ DEPENDENCIES
   lemonsqueezy (~> 1.0)
   mocha
   mysql2
-  net-imap
-  net-pop
-  net-smtp
   paddle (~> 2.6)
   pay!
   pg
diff --git a/gemfiles/rails_main.gemfile b/gemfiles/rails_main.gemfile
index a321aa8a..86ec0a37 100644
--- a/gemfiles/rails_main.gemfile
+++ b/gemfiles/rails_main.gemfile
@@ -22,9 +22,6 @@ gem "importmap-rails"
 gem "sprockets-rails"
 gem "stimulus-rails"
 gem "turbo-rails"
-gem "net-imap", require: false
-gem "net-pop", require: false
-gem "net-smtp", require: false
 gem "rails", branch: "main", git: "https://github.com/rails/rails.git"
 
 gemspec path: "../"
diff --git a/gemfiles/rails_main.gemfile.lock b/gemfiles/rails_main.gemfile.lock
index 21d85002..f5885ee8 100644
--- a/gemfiles/rails_main.gemfile.lock
+++ b/gemfiles/rails_main.gemfile.lock
@@ -327,9 +327,6 @@ DEPENDENCIES
   lemonsqueezy (~> 1.0)
   mocha
   mysql2
-  net-imap
-  net-pop
-  net-smtp
   paddle (~> 2.6)
   pay!
   pg