diff --git a/Gemfile b/Gemfile
index 081a626..0a92ea3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ ruby File.read(File.join(__dir__, ".ruby-version"))
 
 gem 'rails', '~> 5.1.4'
 gem 'pg', '~> 0.18'
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 5.6', '>= 5.6.8'
 gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.3.0'
 gem 'bootstrap', '~> 4.1.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index ac8757f..de7fab7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -106,7 +106,8 @@ GEM
     pg (0.21.0)
     popper_js (1.14.3)
     public_suffix (3.0.3)
-    puma (3.12.0)
+    puma (5.6.8)
+      nio4r (~> 2.0)
     rack (2.0.5)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -202,7 +203,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   minitest-rails
   pg (~> 0.18)
-  puma (~> 3.7)
+  puma (~> 5.6, >= 5.6.8)
   rails (~> 5.1.4)
   sass-rails (~> 5.0)
   selenium-webdriver
@@ -213,7 +214,7 @@ DEPENDENCIES
   web-console (>= 3.3.0)
 
 RUBY VERSION
-   ruby 2.4.4p296
+   ruby 2.7.8p225
 
 BUNDLED WITH
-   1.16.6
+   1.17.3