diff --git a/Gemfile b/Gemfile
index e1702ca..7b2a0ab 100644
--- a/Gemfile
+++ b/Gemfile
@@ -24,3 +24,7 @@ end
 platforms :jruby do
   gem 'jruby-openssl'
 end
+
+if RUBY_VERSION >= '3.4'
+  gem 'mutex_m' # TODO: remove this once as-notifications has such a dependency
+end