diff --git a/Gemfile b/Gemfile
index 8611b33..7b7c480 100644
--- a/Gemfile
+++ b/Gemfile
@@ -18,7 +18,7 @@ gem 'jwt'
 # Use Puma as the app server
 gem "pg"
 
-gem 'puma', '~> 3.12'
+gem 'puma', '~> 4.3'
 
 gem 'rails', '~> 5.2.3'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 43b5491..36f669b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1053,7 +1053,9 @@ GEM
     mime-types (3.3)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2019.1009)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.13.0)
@@ -1071,7 +1073,8 @@ GEM
       ast (~> 2.4.0)
     pg (1.2.1)
     public_suffix (4.0.1)
-    puma (3.12.3)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     rack (2.0.8)
     rack-cache (1.10.0)
       rack (>= 0.4)
@@ -1195,7 +1198,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   open3
   pg
-  puma (~> 3.12)
+  puma (~> 4.3)
   rails (~> 5.2.3)
   redis (= 4.1.2)
   redis-namespace