diff --git a/Gemfile b/Gemfile
index 5b908a9..1bc913a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ gemspec
 rails_version = ENV["RAILS_VERSION"] == "edge" ? { github: "rails/rails" } : ENV["RAILS_VERSION"]
 gem "actionpack", rails_version
 gem "activesupport", rails_version
-gem "concurrent-ruby", "1.3.4"
+gem "concurrent-ruby", "1.3.5"
 
 graphql_version = ENV["GRAPHQL_VERSION"] == "edge" ? { github: "rmosolgo/graphql-ruby", ref: "interpreter-without-legacy" } : ENV["GRAPHQL_VERSION"]
 gem "graphql", graphql_version