diff --git a/Gemfile b/Gemfile
index a400f26..db5e574 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ git_source(:github) do |repo_name|
 end
 
 gem 'rails', '~> 5.0.1'
-gem 'puma', '~> 3.12'
+gem 'puma', '~> 4.3'
 gem 'rack-cors'
 gem 'sidekiq'
 gem 'redis'
diff --git a/Gemfile.lock b/Gemfile.lock
index 81e39ed..701874e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -82,7 +82,8 @@ GEM
     parser (2.4.0.0)
       ast (~> 2.2)
     powerpack (0.1.1)
-    puma (3.12.6)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     rack (2.2.3)
     rack-cors (1.0.2)
     rack-protection (2.0.0)
@@ -181,7 +182,7 @@ DEPENDENCIES
   ffaker
   firebase
   listen (~> 3.0.5)
-  puma (~> 3.12)
+  puma (~> 4.3)
   rack-cors
   rails (~> 5.0.1)
   redis