diff --git a/Gemfile b/Gemfile
index 624f97cdb..84e2b7e75 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 gem 'rails', '= 5.2.6.2'
 gem 'mysql2'
-gem 'puma'
+gem 'puma', '>= 5.6.9'
 gem 'turbolinks', '~> 5'
 gem 'haml'
 gem 'nifty-utils'
diff --git a/Gemfile.lock b/Gemfile.lock
index 84d2fd9d3..af14bc7b9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -147,11 +147,11 @@ GEM
     nilify_blanks (1.3.0)
       activerecord (>= 3.0.0)
       activesupport (>= 3.0.0)
-    nio4r (2.5.8)
+    nio4r (2.7.3)
     nokogiri (1.13.1)
       mini_portile2 (~> 2.7.0)
       racc (~> 1.4)
-    puma (5.6.2)
+    puma (6.4.3)
       nio4r (~> 2.0)
     racc (1.6.0)
     rack (2.2.3)
@@ -278,7 +278,7 @@ DEPENDENCIES
   nifty-utils
   nilify_blanks
   nio4r
-  puma
+  puma (>= 5.6.9)
   rails (= 5.2.6.2)
   resolv (~> 0.2.1)
   rspec
@@ -290,4 +290,4 @@ DEPENDENCIES
   uglifier (>= 1.3.0)
 
 BUNDLED WITH
-   1.17.2
+   1.17.3