diff --git a/Gemfile b/Gemfile
index a5502c4..2f5112e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ source "https://rubygems.org"
 gem "rubocop", ">= 0.47", require: false
 gem "rails", "~> 5.2.0"
 gem "webpacker", "~> 4.0.0"
-gem "puma", "~> 4.0"
+gem "puma", "~> 5.6"
 
 # Specify your gem's dependencies in webpacker-react.gemspec
 gemspec
diff --git a/Gemfile.lock b/Gemfile.lock
index 3471854..b619803 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -79,18 +79,20 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (0.9.2)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
-    nio4r (2.4.0)
+    nio4r (2.5.8)
     nokogiri (1.10.3)
       mini_portile2 (~> 2.4.0)
     parallel (1.17.0)
     parser (2.6.3.0)
       ast (~> 2.4.0)
     public_suffix (3.1.1)
-    puma (4.0.0)
+    puma (5.6.4)
       nio4r (~> 2.0)
     rack (2.0.7)
     rack-proxy (0.6.5)
@@ -165,7 +167,7 @@ DEPENDENCIES
   bundler (~> 1.13)
   capybara
   minitest (~> 5.0)
-  puma (~> 4.0)
+  puma (~> 5.6)
   rails (~> 5.2.0)
   rake (~> 12.0)
   rubocop (>= 0.47)