diff --git a/Gemfile b/Gemfile
index 42208085c..d82673324 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ ruby '>= 2.4.0', '< 2.7.0'
 
 gem 'pkg-config', '~> 1.3'
 
-gem 'puma', '~> 3.12'
+gem 'puma', '~> 4.0'
 gem 'rails', '~> 5.2.3'
 gem 'thor', '~> 0.20'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 4036a05c1..6ff6dac73 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -428,7 +428,8 @@ GEM
     pry-rails (0.3.9)
       pry (>= 0.10.4)
     public_suffix (3.1.1)
-    puma (3.12.1)
+    puma (4.0.1)
+      nio4r (~> 2.0)
     pundit (2.0.1)
       activesupport (>= 3.0.0)
     raabro (1.1.6)
@@ -731,7 +732,7 @@ DEPENDENCIES
   private_address_check (~> 0.5)
   pry-byebug (~> 3.7)
   pry-rails (~> 0.3)
-  puma (~> 3.12)
+  puma (~> 4.0)
   pundit (~> 2.0)
   rack-attack (~> 6.0)
   rack-cors (~> 1.0)