diff --git a/Gemfile b/Gemfile
index 5550c1d8..253946f6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -90,7 +90,7 @@ group :test do
   gem "faker"
   gem "rspec"
   gem "rspec-rails"
-  gem "shoulda-matchers", "~> 5.3"
+  gem "shoulda-matchers", "~> 6.4"
   gem "vcr", "~> 6.2"
   gem "webmock", "~> 3.18"
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 7587bc88..9329175d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -446,7 +446,7 @@ GEM
     sentry-ruby (5.19.0)
       bigdecimal
       concurrent-ruby (~> 1.0, >= 1.0.2)
-    shoulda-matchers (5.3.0)
+    shoulda-matchers (6.4.0)
       activesupport (>= 5.2.0)
     sidekiq (6.5.12)
       connection_pool (>= 2.2.5, < 3)
@@ -592,7 +592,7 @@ DEPENDENCIES
   rspec-rails
   rubocop-govuk
   sentry-rails
-  shoulda-matchers (~> 5.3)
+  shoulda-matchers (~> 6.4)
   sidekiq (< 7)
   sidekiq-cron (~> 1.10)
   solargraph