diff --git a/Gemfile b/Gemfile
index 64688ebed..daf0fbad7 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,7 +7,7 @@ gem 'rails', '~> 5.2.4'
 # Used by rails 5.2 to reduce the app boot time by over 50%
 gem 'bootsnap'
 # Use Puma as web server
-gem 'puma', '3.12.6'
+gem 'puma', '4.3.8'
 gem 'webpacker', '~> 5.x'
 
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
diff --git a/Gemfile.lock b/Gemfile.lock
index 4c520d62a..499d17507 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -264,7 +264,8 @@ GEM
     prawn-table (0.2.2)
       prawn (>= 1.3.0, < 3.0.0)
     public_suffix (4.0.6)
-    puma (3.12.6)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     pundit (2.1.0)
       activesupport (>= 3.0.0)
     raabro (1.1.6)
@@ -469,7 +470,7 @@ DEPENDENCIES
   pg_search
   prawn
   prawn-table
-  puma (= 3.12.6)
+  puma (= 4.3.8)
   pundit
   railroady
   rails (~> 5.2.4)