diff --git a/code/main course/Lesson34/rails/blog/Gemfile b/code/main course/Lesson34/rails/blog/Gemfile
index 51f1dda..7a150a2 100644
--- a/code/main course/Lesson34/rails/blog/Gemfile	
+++ b/code/main course/Lesson34/rails/blog/Gemfile	
@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2.2', '>= 5.2.2.1'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3', '< 1.4'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/code/main course/Lesson34/rails/blog/Gemfile.lock b/code/main course/Lesson34/rails/blog/Gemfile.lock
index f730896..6583563 100644
--- a/code/main course/Lesson34/rails/blog/Gemfile.lock	
+++ b/code/main course/Lesson34/rails/blog/Gemfile.lock	
@@ -107,7 +107,8 @@ GEM
     nokogiri (1.10.2)
       mini_portile2 (~> 2.4.0)
     public_suffix (3.0.3)
-    puma (3.12.1)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.0.6)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -201,7 +202,7 @@ DEPENDENCIES
   coffee-rails (~> 4.2)
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 5.2.2, >= 5.2.2.1)
   sass-rails (~> 5.0)
   selenium-webdriver