diff --git a/words_searcher/lib/t_test_task/Gemfile b/words_searcher/lib/t_test_task/Gemfile
index 18bdb9b..9e01004 100644
--- a/words_searcher/lib/t_test_task/Gemfile
+++ b/words_searcher/lib/t_test_task/Gemfile
@@ -5,7 +5,7 @@ ruby '2.5.1'
 
 gem 'rails', '~> 5.2.0'
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 
 gem 'active_model_serializers', '~> 0.10.0'
 
diff --git a/words_searcher/lib/t_test_task/Gemfile.lock b/words_searcher/lib/t_test_task/Gemfile.lock
index 27a402c..958ddfd 100644
--- a/words_searcher/lib/t_test_task/Gemfile.lock
+++ b/words_searcher/lib/t_test_task/Gemfile.lock
@@ -91,7 +91,9 @@ GEM
     marcel (0.3.2)
       mimemagic (~> 0.3.2)
     method_source (0.9.0)
-    mimemagic (0.3.2)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.0)
     mini_portile2 (2.3.0)
     minitest (5.11.3)
@@ -110,7 +112,8 @@ GEM
       multi_xml (~> 0.5)
       rack (>= 1.2, < 3)
     pg (1.0.0)
-    puma (3.11.4)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     pundit (1.1.0)
       activesupport (>= 3.0.0)
     rack (2.0.5)
@@ -203,7 +206,7 @@ DEPENDENCIES
   jwt
   listen (>= 3.0.5, < 3.2)
   pg (>= 0.18, < 2.0)
-  puma (~> 3.11)
+  puma (~> 4.3)
   pundit
   rack-cors
   rails (~> 5.2.0)