diff --git a/lib/with_advisory_lock.rb b/lib/with_advisory_lock.rb
index a3cf4b8..75381e2 100644
--- a/lib/with_advisory_lock.rb
+++ b/lib/with_advisory_lock.rb
@@ -1,16 +1,15 @@
 require 'with_advisory_lock/version'
 require 'active_support'
-require_relative 'with_advisory_lock/failed_to_acquire_lock'
+require 'zeitwerk'
 
-module WithAdvisoryLock
-  extend ActiveSupport::Autoload
+loader = Zeitwerk::Loader.for_gem
+loader.inflector.inflect(
+  'mysql' => 'MySQL',
+  'postgresql' => 'PostgreSQL',
+  )
+loader.setup
 
-  autoload :Concern
-  autoload :Base
-  autoload :DatabaseAdapterSupport
-  autoload :Flock
-  autoload :MySQL, 'with_advisory_lock/mysql'
-  autoload :PostgreSQL, 'with_advisory_lock/postgresql'
+module WithAdvisoryLock
 end
 
 ActiveSupport.on_load :active_record do
diff --git a/lib/with_advisory_lock/base.rb b/lib/with_advisory_lock/base.rb
index 19f6791..197f4d4 100644
--- a/lib/with_advisory_lock/base.rb
+++ b/lib/with_advisory_lock/base.rb
@@ -79,7 +79,7 @@ def stable_hashcode(input)
       else
         # Ruby MRI's String#hash is randomly seeded as of Ruby 1.9 so
         # make sure we use a deterministic hash.
-        Zlib.crc32(input.to_s)
+        Zlib.crc32(input.to_s, 0)
       end
     end
 
diff --git a/lib/with_advisory_lock/concern.rb b/lib/with_advisory_lock/concern.rb
index 42d566d..66587ce 100644
--- a/lib/with_advisory_lock/concern.rb
+++ b/lib/with_advisory_lock/concern.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require 'active_support/concern'
-
 module WithAdvisoryLock
   module Concern
     extend ActiveSupport::Concern
@@ -15,9 +13,7 @@ def with_advisory_lock(lock_name, options = {}, &block)
 
       def with_advisory_lock!(lock_name, options = {}, &block)
         result = with_advisory_lock_result(lock_name, options, &block)
-        unless result.lock_was_acquired?
-          raise WithAdvisoryLock::FailedToAcquireLock, lock_name
-        end
+        raise WithAdvisoryLock::FailedToAcquireLock, lock_name unless result.lock_was_acquired?
 
         result.result
       end
diff --git a/lib/with_advisory_lock/failed_to_acquire_lock.rb b/lib/with_advisory_lock/failed_to_acquire_lock.rb
index 19e8c01..83ccc5e 100644
--- a/lib/with_advisory_lock/failed_to_acquire_lock.rb
+++ b/lib/with_advisory_lock/failed_to_acquire_lock.rb
@@ -1,7 +1,9 @@
+# frozen_string_literal: true
+
 module WithAdvisoryLock
   class FailedToAcquireLock < StandardError
     def initialize(lock_name)
       super("Failed to acquire lock #{lock_name}")
     end
   end
-end
\ No newline at end of file
+end
diff --git a/with_advisory_lock.gemspec b/with_advisory_lock.gemspec
index 148298c..84bf423 100644
--- a/with_advisory_lock.gemspec
+++ b/with_advisory_lock.gemspec
@@ -25,6 +25,7 @@ Gem::Specification.new do |spec|
   spec.metadata['changelog_uri'] = 'https://github.com/ClosureTree/with_advisory_lock/blob/master/CHANGELOG.md'
 
   spec.add_runtime_dependency 'activerecord', '>= 6.1'
+  spec.add_runtime_dependency 'zeitwerk', '>= 2.6'
 
   spec.add_development_dependency 'appraisal'
   spec.add_development_dependency 'maxitest'