diff --git a/gemstash.gemspec b/gemstash.gemspec
index 5b379d6e..3a1cd27e 100644
--- a/gemstash.gemspec
+++ b/gemstash.gemspec
@@ -40,7 +40,7 @@ you push your own private gems as well."
   spec.add_runtime_dependency "puma", "~> 6.1"
   spec.add_runtime_dependency "sequel", "~> 5.0"
   spec.add_runtime_dependency "server_health_check-rack", "~> 0.1"
-  spec.add_runtime_dependency "sinatra", ">= 1.4", "< 3.0"
+  spec.add_runtime_dependency "sinatra", ">= 1.4", "< 4.0"
   spec.add_runtime_dependency "thor", "~> 0.20"
 
   # Use Redis instead of memcached