diff --git a/Gemfile b/Gemfile
index 7ea3f59..f74a5fe 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ gem 'rails', '~> 5.2.8'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3'
 # Use Puma as the app server
-gem 'puma', '~> 4.3'
+gem 'puma', '~> 6.4'
 # 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 de3b030..c994361 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -222,7 +222,7 @@ GEM
       ruby2_keywords (~> 0.0.1)
     mysql2 (0.5.4)
     netrc (0.11.0)
-    nio4r (2.5.8)
+    nio4r (2.7.1)
     nokogiri (1.15.5-x86_64-linux)
       racc (~> 1.4)
     nulldb (0.3.7.pre.alpha.1)
@@ -244,7 +244,7 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     public_suffix (4.0.7)
-    puma (4.3.12)
+    puma (6.4.2)
       nio4r (~> 2.0)
     racc (1.7.3)
     rack (2.2.8)
@@ -497,7 +497,7 @@ DEPENDENCIES
   nulldb
   omniauth-cas
   pry
-  puma (~> 4.3)
+  puma (~> 6.4)
   rails (~> 5.2.8)
   rails-controller-testing
   rsolr (>= 1.0, < 3)