diff --git a/Gemfile b/Gemfile
index fffb5ac..f8ee509 100644
--- a/Gemfile
+++ b/Gemfile
@@ -41,10 +41,6 @@ gem "mono_logger"
 # gem "opentelemetry-exporter-otlp"
 # gem "opentelemetry-instrumentation-all"
 
-# Fast JSON parsing
-gem "yajl-ruby"
-gem "multi_json"
-
 group :development, :test do
   # See https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem
   gem "debug", platforms: %i[ mri mingw x64_mingw ]
diff --git a/Gemfile.lock b/Gemfile.lock
index 37502f8..d43780d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -125,7 +125,7 @@ GEM
     i18n (1.14.7)
       concurrent-ruby (~> 1.0)
     io-console (0.8.0)
-    irb (1.15.0)
+    irb (1.15.1)
       pp (>= 0.6.0)
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
@@ -155,7 +155,6 @@ GEM
     minitest (5.25.4)
     mono_logger (1.1.2)
     msgpack (1.7.5)
-    multi_json (1.15.0)
     multi_xml (0.7.1)
       bigdecimal (~> 3.1)
     mutex_m (0.3.0)
@@ -210,7 +209,7 @@ GEM
       date
       stringio
     public_suffix (6.0.1)
-    puma (6.5.0)
+    puma (6.6.0)
       nio4r (~> 2.0)
     pyu-ruby-sasl (0.0.3.3)
     racc (1.8.1)
@@ -302,7 +301,6 @@ GEM
     websocket-extensions (0.1.5)
     xpath (3.2.0)
       nokogiri (~> 1.8)
-    yajl-ruby (1.4.3)
     zeitwerk (2.6.18)
 
 PLATFORMS
@@ -322,7 +320,6 @@ DEPENDENCIES
   lograge
   logstash-event
   mono_logger
-  multi_json
   net-imap
   net-pop
   net-smtp
@@ -340,7 +337,6 @@ DEPENDENCIES
   tzinfo-data
   web-console
   webdrivers
-  yajl-ruby
 
 BUNDLED WITH
    2.3.15
diff --git a/config/environments/production.rb b/config/environments/production.rb
index f41a001..b6662d0 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -8,7 +8,6 @@
 
 # Replace the default JSON parser
 require "json"
-require "yajl/json_gem"
 
 UDP_LOG_HOST = ENV["UDP_LOG_HOST"] || ENV["LOGSTASH_HOST"]
 UDP_LOG_PORT = ENV["UDP_LOG_PORT"] || ENV["LOGSTASH_PORT"]
diff --git a/lib/omniauth/strategies/generic_oauth.rb b/lib/omniauth/strategies/generic_oauth.rb
index b6e740d..aa63365 100644
--- a/lib/omniauth/strategies/generic_oauth.rb
+++ b/lib/omniauth/strategies/generic_oauth.rb
@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require "multi_json"
 require "jwt"
 require "omniauth/strategies/oauth2"