diff --git a/Gemfile.lock b/Gemfile.lock
index 47e79e4..7b2ec78 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -15,7 +15,7 @@ PATH
       opentelemetry-sdk (~> 1.0, >= 1.0.2)
       pickup (~> 0.0.11)
       prometheus-client (~> 2.0)
-      puma (~> 5.0, >= 5.0.4)
+      puma (>= 5.0.4, < 7)
       rack (~> 2.2)
       rake (~> 13.0)
       redis (~> 4.1)
@@ -49,8 +49,8 @@ GEM
     mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
     net-ldap (0.17.1)
-    nio4r (2.5.8)
-    nio4r (2.5.8-java)
+    nio4r (2.5.9)
+    nio4r (2.5.9-java)
     opentelemetry-api (1.1.0)
     opentelemetry-common (0.19.6)
       opentelemetry-api (~> 1.0)
@@ -100,9 +100,9 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
       spoon (~> 0.0)
-    puma (5.6.5)
+    puma (6.2.1)
       nio4r (~> 2.0)
-    puma (5.6.5-java)
+    puma (6.2.1-java)
       nio4r (~> 2.0)
     rack (2.2.6.2)
     rack-protection (2.2.4)
diff --git a/vmpooler.gemspec b/vmpooler.gemspec
index 9e3fb3a..0298ac7 100644
--- a/vmpooler.gemspec
+++ b/vmpooler.gemspec
@@ -29,7 +29,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'opentelemetry-sdk', '~> 1.0', '>= 1.0.2'
   s.add_dependency 'pickup', '~> 0.0.11'
   s.add_dependency 'prometheus-client', '~> 2.0'
-  s.add_dependency 'puma', '~> 5.0', '>= 5.0.4'
+  s.add_dependency 'puma', '>= 5.0.4', '< 7'
   s.add_dependency 'rack', '~> 2.2'
   s.add_dependency 'rake', '~> 13.0'
   s.add_dependency 'redis', '~> 4.1'