diff --git a/Gemfile b/Gemfile
index 3e412f6..c907443 100644
--- a/Gemfile
+++ b/Gemfile
@@ -15,7 +15,6 @@ gem "govuk_app_config"
 gem "govuk_message_queue_consumer"
 gem "jsonpath"
 gem "loofah"
-gem "oj"
 
 group :test do
   gem "grpc_mock"
diff --git a/Gemfile.lock b/Gemfile.lock
index 6a7483e..5a29206 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -166,7 +166,6 @@ GEM
       racc (~> 1.4)
     nokogiri (1.15.5-x86_64-linux)
       racc (~> 1.4)
-    oj (3.16.1)
     opentelemetry-api (1.2.3)
     opentelemetry-common (0.20.0)
       opentelemetry-api (~> 1.0)
@@ -520,7 +519,6 @@ DEPENDENCIES
   json_schemer
   jsonpath
   loofah
-  oj
   railties (= 7.0.7.2)
   rspec-rails
   rubocop-govuk
diff --git a/config/initializers/json.rb b/config/initializers/json.rb
deleted file mode 100644
index e1f6e94..0000000
--- a/config/initializers/json.rb
+++ /dev/null
@@ -1,3 +0,0 @@
-# Use Oj for faster JSON handling across the app
-Oj.default_options = { mode: :rails }
-Oj.optimize_rails