diff --git a/Gemfile b/Gemfile
index 8e06a0c7..58d65fb1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,3 @@
 source 'https://rubygems.org'
 gem 'rack'
-gem 'puma'
+gem 'puma', '>= 4.3.12'
diff --git a/Gemfile.lock b/Gemfile.lock
index 7bc119c5..f979b875 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,15 +1,17 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    puma (3.4.0)
+    nio4r (2.5.8)
+    puma (5.6.4)
+      nio4r (~> 2.0)
     rack (1.6.4)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  puma
+  puma (>= 4.3.12)
   rack
 
 BUNDLED WITH
-   1.11.2
+   1.17.3