diff --git a/.ruby-version b/.ruby-version
index 324db8d..4e34c4d 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-ruby-2.6.8
+ruby-2.7.6
diff --git a/Gemfile b/Gemfile
index 88ac8b9..4170559 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem 'rails', '~> 6.0.2'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3'
 # Use Puma as the app server
-gem 'puma', '~> 3.7'
+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 c38a145..3f1cd9c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -69,7 +69,7 @@ GEM
     globalid (1.0.0)
       activesupport (>= 5.0)
     http-accept (1.7.0)
-    http-cookie (1.0.4)
+    http-cookie (1.0.5)
       domain_name (~> 0.5)
     i18n (1.10.0)
       concurrent-ruby (~> 1.0)
@@ -96,7 +96,8 @@ GEM
     nokogiri (1.13.6)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
-    puma (3.12.6)
+    puma (5.6.4)
+      nio4r (~> 2.0)
     racc (1.6.0)
     rack (2.2.3)
     rack-test (1.1.0)
@@ -168,7 +169,7 @@ DEPENDENCIES
   bootsnap
   byebug
   listen (>= 3.0.5, < 3.2)
-  puma (~> 3.7)
+  puma (>= 5.6)
   rails (~> 6.0.2)
   rest-client (>= 2.1.0.rc1, < 2.2)
   spring