diff --git a/io_monitor.gemspec b/io_monitor.gemspec
index 8f4fa47..836f5c8 100644
--- a/io_monitor.gemspec
+++ b/io_monitor.gemspec
@@ -31,7 +31,6 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = ">= 2.6.0"
 
-  rails_version = ENV["RAILS_VERSION"] || ">= 6.0"
-  spec.add_dependency "rails", rails_version
+  spec.add_dependency "rails", ">= 6.1"
   spec.add_development_dependency "redis", ">= 4.0"
 end
diff --git a/lib/io_monitor/controller.rb b/lib/io_monitor/controller.rb
index 065246d..d821c9e 100644
--- a/lib/io_monitor/controller.rb
+++ b/lib/io_monitor/controller.rb
@@ -21,7 +21,7 @@ def append_info_to_payload(payload)
         data[source] = IoMonitor.aggregator.get(source)
       end
 
-      data[:response] = payload[:response]&.body&.bytesize || 0
+      data[:response] = payload[:response].body.bytesize
     end
   end
 end