diff --git a/samples/web/Gemfile b/samples/web/Gemfile
index 98418b3e4..7955c05b2 100644
--- a/samples/web/Gemfile
+++ b/samples/web/Gemfile
@@ -4,3 +4,6 @@ gem 'google-api-client', '~> 0.9'
 gem 'google-id-token', '~> 1.3'
 gem 'redis', '~> 3.2'
 gem 'dotenv'
+
+gem 'sinatra'
+gem 'mime-types-data'
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