diff --git a/test/gemfiles/rails_6_0.gemfile b/test/gemfiles/rails_6_0.gemfile
index db3f394a..89a1f750 100644
--- a/test/gemfiles/rails_6_0.gemfile
+++ b/test/gemfiles/rails_6_0.gemfile
@@ -2,6 +2,7 @@ source 'https://rubygems.org'
 
 gem 'actionpack', '~> 6.0.3'
 gem 'activesupport', '~> 6.0.3'
+gem 'i18n', '!= 1.15.0' # https://github.com/ruby-i18n/i18n/issues/735
 gem 'sassc-rails', '~> 2.0'
 
 gemspec path: '../../'
diff --git a/test/gemfiles/rails_6_1.gemfile b/test/gemfiles/rails_6_1.gemfile
index 358eae29..683a0e29 100644
--- a/test/gemfiles/rails_6_1.gemfile
+++ b/test/gemfiles/rails_6_1.gemfile
@@ -2,6 +2,7 @@ source 'https://rubygems.org'
 
 gem 'actionpack', '~> 6.1.3'
 gem 'activesupport', '~> 6.1.3'
+gem 'i18n', '!= 1.15.0' # https://github.com/ruby-i18n/i18n/issues/735
 gem 'sassc-rails', '~> 2.0'
 
 gemspec path: '../../'
diff --git a/test/gemfiles/rails_7_0_dartsass.gemfile b/test/gemfiles/rails_7_0_dartsass.gemfile
index 7e46b9d9..d23f2ec6 100644
--- a/test/gemfiles/rails_7_0_dartsass.gemfile
+++ b/test/gemfiles/rails_7_0_dartsass.gemfile
@@ -2,6 +2,7 @@ source 'https://rubygems.org'
 
 gem 'actionpack', '~> 7.0.4'
 gem 'activesupport', '~> 7.0.4'
+gem 'i18n', '!= 1.15.0' # https://github.com/ruby-i18n/i18n/issues/735
 gem 'dartsass-sprockets', '~> 3.0'
 
 gemspec path: '../../'
diff --git a/test/gemfiles/rails_7_0_sassc.gemfile b/test/gemfiles/rails_7_0_sassc.gemfile
index e5fe36e6..2b51fbe8 100644
--- a/test/gemfiles/rails_7_0_sassc.gemfile
+++ b/test/gemfiles/rails_7_0_sassc.gemfile
@@ -2,6 +2,7 @@ source 'https://rubygems.org'
 
 gem 'actionpack', '~> 7.0.4'
 gem 'activesupport', '~> 7.0.4'
+gem 'i18n', '!= 1.15.0' # https://github.com/ruby-i18n/i18n/issues/735
 gem 'sassc-rails', '~> 2.0'
 
 gemspec path: '../../'