diff --git a/Gemfile b/Gemfile
index 8fcbab6..b73b76c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ ruby '2.7.0'
 
 gem 'rails', '~> 5.2.4', '>= 5.2.4.3'
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.3.0'
 gem 'coffee-rails', '~> 4.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index ff8613e..349b5d8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -198,7 +198,8 @@ GEM
       byebug (~> 11.0)
       pry (~> 0.13.0)
     public_suffix (4.0.6)
-    puma (3.12.6)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)
     rack-test (1.1.0)
@@ -318,7 +319,7 @@ DEPENDENCIES
   pg (>= 0.18, < 2.0)
   popper (~> 0.5.1)
   pry-byebug
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 5.2.4, >= 5.2.4.3)
   redcarpet (~> 3.5)
   redis (~> 4.2, >= 4.2.1)