diff --git a/Gemfile b/Gemfile
index ebb2029..05e7f92 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ ruby '2.5.3'
 gem 'rails', '~> 5.2.4', '>= 5.2.4.3'
 gem 'json'
 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 e59044f..efc0477 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -154,7 +154,8 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     public_suffix (4.0.5)
-    puma (3.12.6)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.2.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -288,7 +289,7 @@ DEPENDENCIES
   omniauth-google-oauth2
   pg (>= 0.18, < 2.0)
   pry
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 5.2.4, >= 5.2.4.3)
   rspec-rails
   sass-rails (~> 5.0)