diff --git a/test/gemfiles/rails_4_2.gemfile b/test/gemfiles/rails_4_2.gemfile
index 2ed22bd7..b870aa97 100644
--- a/test/gemfiles/rails_4_2.gemfile
+++ b/test/gemfiles/rails_4_2.gemfile
@@ -6,3 +6,6 @@ gem 'sassc-rails', '~> 2.0'
 gem 'bigdecimal', '1.3.5'
 
 gemspec path: '../../'
+
+# json ~> 3 raises ArgumentError: unknown keyword: quirks_mode
+gem 'json', '~> 2.7'
diff --git a/test/gemfiles/rails_5_0.gemfile b/test/gemfiles/rails_5_0.gemfile
index a18643d4..889d2311 100644
--- a/test/gemfiles/rails_5_0.gemfile
+++ b/test/gemfiles/rails_5_0.gemfile
@@ -5,3 +5,6 @@ gem 'activesupport', '~> 5.0.0'
 gem 'sassc-rails', '~> 2.0'
 
 gemspec path: '../../'
+
+# json ~> 3 raises ArgumentError: unknown keyword: quirks_mode
+gem 'json', '~> 2.7'
diff --git a/test/gemfiles/rails_5_1.gemfile b/test/gemfiles/rails_5_1.gemfile
index 13f942c8..50ec2ce8 100644
--- a/test/gemfiles/rails_5_1.gemfile
+++ b/test/gemfiles/rails_5_1.gemfile
@@ -5,3 +5,6 @@ gem 'activesupport', '~> 5.1.0'
 gem 'sassc-rails', '~> 2.0'
 
 gemspec path: '../../'
+
+# json ~> 3 raises ArgumentError: unknown keyword: quirks_mode
+gem 'json', '~> 2.7'
diff --git a/test/gemfiles/rails_5_2.gemfile b/test/gemfiles/rails_5_2.gemfile
index 767833c5..2ba5ea51 100644
--- a/test/gemfiles/rails_5_2.gemfile
+++ b/test/gemfiles/rails_5_2.gemfile
@@ -5,3 +5,6 @@ gem 'activesupport', '~> 5.2.8'
 gem 'sassc-rails', '~> 2.0'
 
 gemspec path: '../../'
+
+# json ~> 3 raises ArgumentError: unknown keyword: quirks_mode
+gem 'json', '~> 2.7'
diff --git a/test/gemfiles/rails_6_0.gemfile b/test/gemfiles/rails_6_0.gemfile
index db3f394a..d0fe5591 100644
--- a/test/gemfiles/rails_6_0.gemfile
+++ b/test/gemfiles/rails_6_0.gemfile
@@ -6,6 +6,9 @@ gem 'sassc-rails', '~> 2.0'
 
 gemspec path: '../../'
 
+# json ~> 3 raises ArgumentError: unknown keyword: quirks_mode
+gem 'json', '~> 2.7'
+
 # no longer bundled as default gems in newer ruby
 gem 'base64'
 gem 'benchmark'
@@ -13,3 +16,4 @@ gem 'drb'
 gem 'mutex_m'
 gem 'ruby2_keywords'
 gem 'tsort'
+gem 'webrick'
diff --git a/test/gemfiles/rails_6_1.gemfile b/test/gemfiles/rails_6_1.gemfile
index 358eae29..ad5401e1 100644
--- a/test/gemfiles/rails_6_1.gemfile
+++ b/test/gemfiles/rails_6_1.gemfile
@@ -6,6 +6,9 @@ gem 'sassc-rails', '~> 2.0'
 
 gemspec path: '../../'
 
+# json ~> 3 raises ArgumentError: unknown keyword: quirks_mode
+gem 'json', '~> 2.7'
+
 # no longer bundled as default gems in newer ruby
 gem 'base64'
 gem 'benchmark'
@@ -13,3 +16,4 @@ gem 'drb'
 gem 'mutex_m'
 gem 'ruby2_keywords'
 gem 'tsort'
+gem 'webrick'
diff --git a/test/gemfiles/rails_7_0_dartsass.gemfile b/test/gemfiles/rails_7_0_dartsass.gemfile
index 7e46b9d9..48e9ce00 100644
--- a/test/gemfiles/rails_7_0_dartsass.gemfile
+++ b/test/gemfiles/rails_7_0_dartsass.gemfile
@@ -6,6 +6,9 @@ gem 'dartsass-sprockets', '~> 3.0'
 
 gemspec path: '../../'
 
+# json ~> 3 raises ArgumentError: unknown keyword: quirks_mode
+gem 'json', '~> 2.7'
+
 # no longer bundled as default gems in newer ruby
 gem 'base64'
 gem 'benchmark'
@@ -13,3 +16,4 @@ gem 'drb'
 gem 'mutex_m'
 gem 'ruby2_keywords'
 gem 'tsort'
+gem 'webrick'
diff --git a/test/gemfiles/rails_7_0_sassc.gemfile b/test/gemfiles/rails_7_0_sassc.gemfile
index e5fe36e6..93d103d2 100644
--- a/test/gemfiles/rails_7_0_sassc.gemfile
+++ b/test/gemfiles/rails_7_0_sassc.gemfile
@@ -6,6 +6,9 @@ gem 'sassc-rails', '~> 2.0'
 
 gemspec path: '../../'
 
+# json ~> 3 raises ArgumentError: unknown keyword: quirks_mode
+gem 'json', '~> 2.7'
+
 # no longer bundled as default gems in newer ruby
 gem 'base64'
 gem 'benchmark'
@@ -13,3 +16,4 @@ gem 'drb'
 gem 'mutex_m'
 gem 'ruby2_keywords'
 gem 'tsort'
+gem 'webrick'