diff --git a/Gemfile b/Gemfile
index 2f7b64c..e2ff41a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem 'rails', '~> 5.1.6'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3'
 # Use Puma as the app server
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 5.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/Gemfile.lock b/Gemfile.lock
index 471a758..74e1cbd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -493,7 +493,8 @@ GEM
     power_converter (0.1.2)
     public_suffix (3.0.2)
     pul_uv_rails (2.0.1)
-    puma (3.11.4)
+    puma (5.3.2)
+      nio4r (~> 2.0)
     qa (2.0.1)
       activerecord-import
       deprecation
@@ -769,7 +770,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   loofah (~> 2.0, >= 2.0.3)
   pg
-  puma (~> 3.7)
+  puma (~> 5.3)
   rails (~> 5.1.6)
   recaptcha
   riiif (~> 1.1)