diff --git a/Gemfile b/Gemfile
index e20b1260..a4f2b955 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ ruby '2.6.3'
 
 gem 'rails', '~> 5.2.3'
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 gem 'bootsnap', '>= 1.1.0', require: false
 
 group :development, :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index fccf6f5f..d6bf8780 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -77,7 +77,8 @@ GEM
     nokogiri (1.10.2)
       mini_portile2 (~> 2.4.0)
     pg (1.1.4)
-    puma (3.12.1)
+    puma (4.3.9)
+      nio4r (~> 2.0)
     rack (2.0.6)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -138,7 +139,7 @@ DEPENDENCIES
   byebug
   listen (>= 3.0.5, < 3.2)
   pg (>= 0.18, < 2.0)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 5.2.3)
   tzinfo-data
   web-console (>= 3.3.0)