diff --git a/Gemfile b/Gemfile
index 0d6bdd8..d2e6181 100644
--- a/Gemfile
+++ b/Gemfile
@@ -13,7 +13,7 @@ gem "pg", "~> 0.21.0"
 gem "geo_coord"
 
 # Use Puma as the app server
-gem "puma", "~> 3.7"
+gem "puma", "~> 4.3"
 gem "chronic"
 # Use SCSS for stylesheets
 gem "sass-rails", "~> 6.0"
diff --git a/Gemfile.lock b/Gemfile.lock
index e279742..ca65425 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -244,7 +244,9 @@ GEM
       mimemagic (~> 0.3.2)
     memoist (0.16.2)
     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)
@@ -274,7 +276,8 @@ GEM
       pry (>= 0.10.4)
     psych (3.1.0)
     public_suffix (4.0.1)
-    puma (3.11.4)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     pundit (1.1.0)
       activesupport (>= 3.0.0)
     pundit-matchers (1.4.1)
@@ -514,7 +517,7 @@ DEPENDENCIES
   pg (~> 0.21.0)
   pry-byebug (~> 3.5)
   pry-rails
-  puma (~> 3.7)
+  puma (~> 4.3)
   pundit (~> 1.1)
   pundit-matchers (~> 1.4.1)
   rails (~> 5.2.2.1)