diff --git a/dry-schema.gemspec b/dry-schema.gemspec
index a1c7ae2..a3a7871 100644
--- a/dry-schema.gemspec
+++ b/dry-schema.gemspec
@@ -34,12 +34,13 @@ Gem::Specification.new do |spec|
   spec.required_ruby_version = ">= 2.7.0"
 
   # to update dependencies edit project.yml
-  spec.add_runtime_dependency "zeitwerk", "~> 2.6"
+  spec.add_runtime_dependency "concurrent-ruby", "~> 1.0"
   spec.add_runtime_dependency "dry-configurable", "~> 1.0", "< 2"
   spec.add_runtime_dependency "dry-core", "~> 1.0", "< 2"
   spec.add_runtime_dependency "dry-initializer", "~> 3.0"
   spec.add_runtime_dependency "dry-logic", ">= 1.4", "< 2"
   spec.add_runtime_dependency "dry-types", ">= 1.7", "< 2"
+  spec.add_runtime_dependency "zeitwerk", "~> 2.6"
 
   spec.add_development_dependency "bundler"
   spec.add_development_dependency "rake"