diff --git a/vmpooler.gemspec b/vmpooler.gemspec
index bdc514a..e6135b4 100644
--- a/vmpooler.gemspec
+++ b/vmpooler.gemspec
@@ -30,7 +30,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'opentelemetry-sdk', '= 0.8.0'
   s.add_dependency 'pickup', '~> 0.0.11'
   s.add_dependency 'prometheus-client', '~> 2.0'
-  s.add_dependency 'puma', '~> 4.3'
+  s.add_dependency 'puma', '~> 5.0', '>= 5.0.4'
   s.add_dependency 'rack', '~> 2.2'
   s.add_dependency 'rake', '~> 13.0'
   s.add_dependency 'rbvmomi', '>= 2.1', '< 4.0'