diff --git a/Gemfile b/Gemfile
index 298f118..111ec40 100644
--- a/Gemfile
+++ b/Gemfile
@@ -14,7 +14,7 @@ gem 'hirb'
 gem 'jsonb_accessor'
 gem 'pg'
 
-gem 'puma'
+gem 'puma', '>= 3.12.4'
 
 gem 'font_awesome5_rails'
 gem 'sassc-rails'
diff --git a/Gemfile.lock b/Gemfile.lock
index 5bf7fb6..a26db00 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -231,7 +231,8 @@ GEM
       i18n (>= 0.5.0)
       railties (>= 3.0.0)
     public_suffix (3.0.3)
-    puma (3.12.1)
+    puma (4.3.3)
+      nio4r (~> 2.0)
     pundit (2.0.0)
       activesupport (>= 3.0.0)
     pundit-matchers (1.6.0)
@@ -411,7 +412,7 @@ DEPENDENCIES
   pg
   pry-byebug
   public_activity
-  puma
+  puma (>= 3.12.4)
   pundit
   pundit-matchers
   rails (~> 5.2.2)