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-rw-r--r--activesupport/lib/active_support/notifications/fanout.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/notifications/fanout.rb b/activesupport/lib/active_support/notifications/fanout.rb
index 71354dd15f..7798c7ec60 100644
--- a/activesupport/lib/active_support/notifications/fanout.rb
+++ b/activesupport/lib/active_support/notifications/fanout.rb
@@ -1,5 +1,5 @@
require 'mutex_m'
-require 'concurrent'
+require 'concurrent/map'
module ActiveSupport
module Notifications