diff --git a/Gemfile b/Gemfile
index 31ec90d..dabb9ae 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem 'rails', '~> 5.2.1'
 
 gem 'rack-ssl-enforcer'
 
-gem 'puma', '~>3.12.0'
+gem 'puma', '~>4.3.12'
 gem 'pg', '~>0.18.4'
 
 gem 'activerecord-postgis-adapter', '~> 5.2.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index e54cde0..7ce83b3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -222,7 +222,9 @@ GEM
     mime-types (3.2.2)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2018.0812)
-    mimemagic (0.3.2)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.1)
     mini_portile2 (2.3.0)
     minitest (5.11.3)
@@ -271,7 +273,8 @@ GEM
       binding_of_caller (>= 0.7)
       pry (>= 0.9.11)
     public_suffix (3.0.3)
-    puma (3.12.0)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.0.5)
     rack-attack (4.3.1)
       rack
@@ -468,7 +471,7 @@ DEPENDENCIES
   pry-remote
   pry-rescue
   pry-stack_explorer
-  puma (~> 3.12.0)
+  puma (~> 4.3.12)
   rack-attack (~> 4.3.0)
   rack-cors (~> 0.4.1)
   rack-rewrite (~> 1.5.1)