diff --git a/Gemfile b/Gemfile
index 879a382..9729781 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,7 +10,7 @@ gem 'rails', '~> 5.2.4'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 
 # Use Json Web Token (JWT) for token based authentication
 gem 'devise'
diff --git a/Gemfile.lock b/Gemfile.lock
index adb8064..f2d1435 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -117,7 +117,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (1.0.0)
-    mimemagic (0.3.4)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.14.0)
@@ -127,7 +129,8 @@ GEM
       mini_portile2 (~> 2.4.0)
     orm_adapter (0.5.0)
     pg (1.2.3)
-    puma (3.12.4)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     raabro (1.1.6)
     rack (2.2.2)
     rack-cors (1.1.1)
@@ -250,7 +253,7 @@ DEPENDENCIES
   faker
   listen (>= 3.0.5, < 3.2)
   pg (>= 0.18, < 2.0)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rack-cors
   rails (~> 5.2.4)
   redis (~> 4.0)