diff --git a/CHANGELOG b/CHANGELOG
index 92a8114..1682923 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,7 @@
+3.1.21 Dec 31 2025
+  - Use constant time comparisons
+  - Mark as Ractor safe
+
 3.1.20 Nov 17 2023
   - Limit packaged files -- decrease gem filesize by ~28% [GH #272 by @pusewicz]
 
diff --git a/Rakefile b/Rakefile
index 58b51fe..95e22a5 100644
--- a/Rakefile
+++ b/Rakefile
@@ -5,6 +5,8 @@ require 'rake/javaextensiontask'
 require 'rake/clean'
 require 'rdoc/task'
 require 'benchmark'
+require "bundler"
+Bundler::GemHelper.install_tasks
 
 CLEAN.include(
   "tmp",
diff --git a/bcrypt.gemspec b/bcrypt.gemspec
index bae0473..e35a402 100644
--- a/bcrypt.gemspec
+++ b/bcrypt.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification.new do |s|
   s.name = 'bcrypt'
-  s.version = '3.1.20'
+  s.version = '3.1.21'
 
   s.summary = "OpenBSD's bcrypt() password hashing algorithm."
   s.description = <<-EOF