diff --git a/geo-app-backend/Gemfile b/geo-app-backend/Gemfile
index 6bb1cb0..bd2081a 100644
--- a/geo-app-backend/Gemfile
+++ b/geo-app-backend/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 6.0.0'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
-gem 'puma', '~> 3.12'
+gem 'puma', '~> 4.3'
 gem 'faker'
 gem 'active_model_serializers'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
diff --git a/geo-app-backend/Gemfile.lock b/geo-app-backend/Gemfile.lock
index e4d9ca2..1298ff2 100644
--- a/geo-app-backend/Gemfile.lock
+++ b/geo-app-backend/Gemfile.lock
@@ -90,7 +90,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (0.9.2)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.12.2)
@@ -99,7 +101,8 @@ GEM
     nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
     pg (1.1.4)
-    puma (3.12.2)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     rack (2.0.8)
     rack-cors (1.0.5)
       rack (>= 1.6.0)
@@ -166,7 +169,7 @@ DEPENDENCIES
   faker
   listen (>= 3.0.5, < 3.2)
   pg (>= 0.18, < 2.0)
-  puma (~> 3.12)
+  puma (~> 4.3)
   rack-cors
   rails (~> 6.0.0)
   spring