diff --git a/Gemfile b/Gemfile
index 5151523..7dbe1d7 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,7 +7,7 @@ ruby ">= 2.6.10"
 gem 'cocoapods', '>= 1.13', '!= 1.15.0', '!= 1.15.1'
 gem 'activesupport', '>= 6.1.7.5', '!= 7.1.0'
 gem 'xcodeproj', '< 1.26.0'
-gem 'concurrent-ruby', '< 1.3.4'
+gem 'concurrent-ruby', '< 1.3.9'
 
 # Ruby 3.4.0 has removed some libraries from the standard library.
 gem 'bigdecimal'