diff --git a/Gemfile b/Gemfile
index 0e82415..2c79582 100644
--- a/Gemfile
+++ b/Gemfile
@@ -20,3 +20,5 @@ gem 'test-unit', '3.6.2'
 
 gem "base64", "~> 0.2.0"
 gem "mutex_m", "~> 0.3.0"
+
+gem "concurrent-ruby", "~> 1.3", "< 1.3.5"
diff --git a/Gemfile.lock b/Gemfile.lock
index 7570d81..f2daa2c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -255,6 +255,7 @@ DEPENDENCIES
   appraisal-matrix
   base64 (~> 0.2.0)
   bigdecimal
+  concurrent-ruby (~> 1.3, < 1.3.5)
   jquery-rails
   minitest (~> 5.25)
   minitest-reporters
diff --git a/gemfiles/activerecord_6_0.gemfile b/gemfiles/activerecord_6_0.gemfile
index 69e3516..d711fec 100644
--- a/gemfiles/activerecord_6_0.gemfile
+++ b/gemfiles/activerecord_6_0.gemfile
@@ -17,6 +17,7 @@ gem "test_after_commit", require: false
 gem "test-unit", "3.6.2"
 gem "base64", "~> 0.2.0"
 gem "mutex_m", "~> 0.3.0"
+gem "concurrent-ruby", "~> 1.3", "< 1.3.5"
 gem "activerecord", "~> 6.0.0"
 
 gemspec path: "../"
diff --git a/gemfiles/activerecord_6_1.gemfile b/gemfiles/activerecord_6_1.gemfile
index 14d2230..c611cd1 100644
--- a/gemfiles/activerecord_6_1.gemfile
+++ b/gemfiles/activerecord_6_1.gemfile
@@ -17,6 +17,7 @@ gem "test_after_commit", require: false
 gem "test-unit", "3.6.2"
 gem "base64", "~> 0.2.0"
 gem "mutex_m", "~> 0.3.0"
+gem "concurrent-ruby", "~> 1.3", "< 1.3.5"
 gem "activerecord", "~> 6.1.0"
 
 gemspec path: "../"
diff --git a/gemfiles/activerecord_7_0.gemfile b/gemfiles/activerecord_7_0.gemfile
index 7533c9b..cac9ceb 100644
--- a/gemfiles/activerecord_7_0.gemfile
+++ b/gemfiles/activerecord_7_0.gemfile
@@ -17,6 +17,7 @@ gem "test_after_commit", require: false
 gem "test-unit", "3.6.2"
 gem "base64", "~> 0.2.0"
 gem "mutex_m", "~> 0.3.0"
+gem "concurrent-ruby", "~> 1.3", "< 1.3.5"
 gem "activerecord", "~> 7.0.0"
 
 gemspec path: "../"
diff --git a/gemfiles/activerecord_7_1.gemfile b/gemfiles/activerecord_7_1.gemfile
index ae53e09..650218f 100644
--- a/gemfiles/activerecord_7_1.gemfile
+++ b/gemfiles/activerecord_7_1.gemfile
@@ -17,6 +17,7 @@ gem "test_after_commit", require: false
 gem "test-unit", "3.6.2"
 gem "base64", "~> 0.2.0"
 gem "mutex_m", "~> 0.3.0"
+gem "concurrent-ruby", "~> 1.3", "< 1.3.5"
 gem "activerecord", "~> 7.1.0"
 
 gemspec path: "../"
diff --git a/gemfiles/activerecord_7_2.gemfile b/gemfiles/activerecord_7_2.gemfile
index 9eea161..f0d08cf 100644
--- a/gemfiles/activerecord_7_2.gemfile
+++ b/gemfiles/activerecord_7_2.gemfile
@@ -17,6 +17,7 @@ gem "test_after_commit", require: false
 gem "test-unit", "3.6.2"
 gem "base64", "~> 0.2.0"
 gem "mutex_m", "~> 0.3.0"
+gem "concurrent-ruby", "~> 1.3", "< 1.3.5"
 gem "activerecord", "~> 7.2.0"
 
 gemspec path: "../"
diff --git a/gemfiles/activerecord_8_0.gemfile b/gemfiles/activerecord_8_0.gemfile
index 79fa7d6..cdf2941 100644
--- a/gemfiles/activerecord_8_0.gemfile
+++ b/gemfiles/activerecord_8_0.gemfile
@@ -17,6 +17,7 @@ gem "test_after_commit", require: false
 gem "test-unit", "3.6.2"
 gem "base64", "~> 0.2.0"
 gem "mutex_m", "~> 0.3.0"
+gem "concurrent-ruby", "~> 1.3", "< 1.3.5"
 gem "activerecord", "~> 8.0.0"
 
 gemspec path: "../"