diff --git a/Gemfile b/Gemfile
index 4bd47a3..a348fb9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem 'rails', '~> 6.0.3', '>= 6.0.3.2'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
-gem 'puma', '~> 4.1'
+gem 'puma', '~> 4.3'
 
 gem 'grape'
 gem 'grape_on_rails_routes'
diff --git a/Gemfile.lock b/Gemfile.lock
index bfac3d9..55ba92e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -122,14 +122,14 @@ GEM
       ruby2_keywords (~> 0.0.1)
     mustermann-grape (1.0.1)
       mustermann (>= 1.0.0)
-    nio4r (2.5.2)
+    nio4r (2.5.8)
     nokogiri (1.10.10)
       mini_portile2 (~> 2.4.0)
     parallel (1.19.2)
     parser (2.7.1.4)
       ast (~> 2.4.1)
     pg (1.2.3)
-    puma (4.3.5)
+    puma (4.3.12)
       nio4r (~> 2.0)
     rack (2.2.3)
     rack-accept (0.4.5)
@@ -220,7 +220,7 @@ DEPENDENCIES
   grape_on_rails_routes
   listen (~> 3.2)
   pg (>= 0.18, < 2.0)
-  puma (~> 4.1)
+  puma (~> 4.3)
   rack-cors
   rails (~> 6.0.3, >= 6.0.3.2)
   rubocop (~> 0.89.1)