diff --git a/Gemfile b/Gemfile
index 6b0c22c8..c08392b5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 source "http://rubygems.org"
 
 gem 'rails', '5.1.4'
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 5.5'
 
 # Declare your gem's dependencies in will_filter.gemspec.
 gemspec
diff --git a/Gemfile.lock b/Gemfile.lock
index 9f0598cb..1e08a7d4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -104,7 +104,8 @@ GEM
     pry (0.11.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    puma (3.10.0)
+    puma (5.5.1)
+      nio4r (~> 2.0)
     rack (2.0.3)
     rack-test (0.7.0)
       rack (>= 1.0, < 3)
@@ -200,7 +201,7 @@ DEPENDENCIES
   jquery-ui-rails
   kaminari
   pry
-  puma (~> 3.7)
+  puma (~> 5.5)
   rails (= 5.1.4)
   rr
   rspec