diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 2ea7ba2..5534dc0 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -30,6 +30,7 @@ jobs:
           - "3.1"
           - "3.2"
           - "3.3"
+          - "3.4"
           - jruby
         gemfile:
           - gemfiles/rails_6_1.gemfile
diff --git a/Gemfile b/Gemfile
index 8ff6b94..9fd11bf 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,3 +4,5 @@ gem 'rcov',      :platforms => :mri_18, :group => [:development, :test]
 gem 'simplecov', :platforms => [:jruby, :mri_19, :ruby_19, :mri_20, :rbx], :group => [:development, :test], :require => false
 gem 'jruby-openssl', :platform => :jruby
 gem 'rails'
+# For Ruby 3.4 compatibility until this commit of httpclient is released https://github.com/nahi/httpclient/commit/552a56770689e800ad11a21cd06075064736569f
+gem 'mutex_m'