diff --git a/Gemfile b/Gemfile
index fbe2172d..fa8d75cd 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ ruby ">= 2.7"
 
 gem "grape", "~> 1.7.0"
 gem "rails", "~> 7.1.0"
-gem "sinatra", "~> 3.0.0"
+gem "sinatra", "~> 4.0.0"
 
 eval_gemfile "./gemfiles/Gemfile.additional"