diff --git a/aws_lambda_ric.gemspec b/aws_lambda_ric.gemspec
index 6fd0fb1..67e3799 100644
--- a/aws_lambda_ric.gemspec
+++ b/aws_lambda_ric.gemspec
@@ -31,6 +31,7 @@ Gem::Specification.new do |spec|
   spec.executables           = 'aws_lambda_ric'
   spec.require_paths         = ['lib']
 
+  spec.add_runtime_dependency "logger", ">= 1.4", "< 2.0"
   spec.add_development_dependency 'bundler', '~> 2.0'
   spec.add_development_dependency 'minitest', '~> 5.0'
   spec.add_development_dependency 'rake', '~> 13.0'