diff --git a/Gemfile b/Gemfile
index 71bacd97..48e30d20 100644
--- a/Gemfile
+++ b/Gemfile
@@ -33,7 +33,7 @@ gem 'pg_query', '>= 0.9.0'
 gem 'pg_search', '~> 2.1.2'
 gem 'pghero', '~> 2.6.0'
 gem 'photoswipe-rails', '~> 4.1', '>= 4.1.2'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 gem 'pundit', '~> 1.1.0'
 gem 'rack-canonical-host', '~> 0.2'
 gem 'rgeo', '~> 2.1.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index 02e8c5ef..96895873 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -260,7 +260,9 @@ GEM
       mimemagic (~> 0.3.2)
     memory_profiler (0.9.14)
     method_source (0.9.2)
-    mimemagic (0.3.2)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_histogram (0.1.3)
     mini_magick (4.10.1)
     mini_mime (1.0.0)
@@ -300,7 +302,8 @@ GEM
     pry-rails (0.3.6)
       pry (>= 0.10.4)
     public_suffix (3.0.2)
-    puma (3.11.3)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     pundit (1.1.0)
       activesupport (>= 3.0.0)
     rack (2.2.2)
@@ -561,7 +564,7 @@ DEPENDENCIES
   photoswipe-rails (~> 4.1, >= 4.1.2)
   pry-byebug (~> 3.5)
   pry-rails (~> 0.3)
-  puma (~> 3.11)
+  puma (~> 4.3)
   pundit (~> 1.1.0)
   rack-canonical-host (~> 0.2)
   rack-cors (~> 1.1.1)