diff --git a/Gemfile b/Gemfile
index 42f8acc..daa9a6e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ ruby '3.0.0'
 gem 'roda', '>= 3.38'
 
 # Use Puma as the app server.
-gem 'puma', '~> 5.2'
+gem 'puma', '~> 5.3'
 
 # A make-like build utility for Ruby.
 gem 'rake'
diff --git a/Gemfile.lock b/Gemfile.lock
index 689f1cb..26ed98d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -80,7 +80,7 @@ GEM
       launchy (~> 2.2)
     method_source (1.0.0)
     minitest (5.14.3)
-    nio4r (2.5.4)
+    nio4r (2.5.7)
     oj (3.11.2)
     parallel (1.20.1)
     parser (3.0.0.0)
@@ -92,7 +92,7 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     public_suffix (4.0.6)
-    puma (5.2.0)
+    puma (5.3.1)
       nio4r (~> 2.0)
     rack (2.2.3)
     rack-test (1.1.0)
@@ -170,7 +170,7 @@ DEPENDENCIES
   letter_opener
   oj
   pry
-  puma (~> 5.2)
+  puma (~> 5.3)
   rack-test
   rake
   roda (>= 3.38)