diff --git a/Gemfile b/Gemfile
index 9cfce08..0ec0aa3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ end
 
 gem 'rails', '~> 5.1.7'
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 4.3'
 
 gem 'rack-cors'
 gem 'fast_jsonapi'
diff --git a/Gemfile.lock b/Gemfile.lock
index 17fd1b5..a913e78 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -106,7 +106,8 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     public_suffix (4.0.5)
-    puma (3.12.4)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.2.2)
     rack-cors (1.1.1)
       rack (>= 2.0.0)
@@ -215,7 +216,7 @@ DEPENDENCIES
   orderly
   pg (>= 0.18, < 2.0)
   pry
-  puma (~> 3.7)
+  puma (~> 4.3)
   rack-cors
   rails (~> 5.1.7)
   rspec-rails