diff --git a/instrumentation/grape/Gemfile b/instrumentation/grape/Gemfile
index ed1ec924e..a97f3cccf 100644
--- a/instrumentation/grape/Gemfile
+++ b/instrumentation/grape/Gemfile
@@ -15,4 +15,5 @@ gemspec
 group :test do
   gem 'opentelemetry-instrumentation-base', path: '../base'
   gem 'opentelemetry-instrumentation-rack', path: '../rack'
+  gem 'builder'
 end