diff --git a/Gemfile b/Gemfile
index 172e2c9..b76f37f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem 'rails', '~> 5.1.4'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3'
 # Use Puma as the app server
-gem 'puma', '~> 3.12'
+gem 'puma', '~> 5.6'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 # gem 'jbuilder', '~> 2.5'
 # Use Redis adapter to run Action Cable in production
diff --git a/Gemfile.lock b/Gemfile.lock
index d5a3497..2376e68 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -60,7 +60,9 @@ GEM
     mail (2.7.1)
       mini_mime (>= 0.1.1)
     method_source (0.9.2)
-    mimemagic (0.3.3)
+    mimemagic (0.4.3)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.1)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
@@ -69,7 +71,8 @@ GEM
       mini_portile2 (~> 2.4.0)
     nokogiri (1.10.5-x86-mingw32)
       mini_portile2 (~> 2.4.0)
-    puma (3.12.1)
+    puma (5.6.2)
+      nio4r (~> 2.0)
     rack (2.1.2)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -132,7 +135,7 @@ DEPENDENCIES
   byebug
   listen (>= 3.0.5, < 3.2)
   mimemagic
-  puma (~> 3.12)
+  puma (~> 5.6)
   rails (~> 5.1.4)
   spring
   spring-watcher-listen (~> 2.0.0)