diff --git a/Gemfile b/Gemfile
index 2cab91c4..e328bf04 100644
--- a/Gemfile
+++ b/Gemfile
@@ -17,7 +17,7 @@ gem "openssl"
 gem "puma", "~> 5.5"
 gem "rails", "~> 6.1.4"
 gem "ransack"
-gem "sassc-rails"
+gem "sassc-rails", "~> 2.1.0"
 gem "sentry-rails"
 gem "sentry-ruby"
 gem "sprockets", "~> 4.0.2"
diff --git a/Gemfile.lock b/Gemfile.lock
index 0ed67552..e78fa8e2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -374,7 +374,7 @@ DEPENDENCIES
   ransack
   rspec-rails (~> 5.0.2)
   rubocop-govuk
-  sassc-rails
+  sassc-rails (~> 2.1.0)
   selenium-webdriver
   sentry-rails
   sentry-ruby