diff --git a/Gemfile b/Gemfile
index cd13f02..7ecedc2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ gem 'rails', '~> 5.1.0'
 # thinking-sphinx, as Sphinx uses the MySQL protocol
 gem 'mysql2'
 # Use Puma as the app server
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 3.12'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/Gemfile.lock b/Gemfile.lock
index c17d804..a3e1f0c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -162,7 +162,7 @@ GEM
       ast (~> 2.4.0)
     popper_js (1.12.9)
     powerpack (0.1.1)
-    puma (3.11.3)
+    puma (3.12.3)
     rabl-rails (0.5.2)
       activesupport (>= 4.2)
       concurrent-ruby (~> 1.0.0)
@@ -311,7 +311,7 @@ DEPENDENCIES
   memory_profiler
   mysql2
   net-ldap
-  puma (~> 3.0)
+  puma (~> 3.12)
   rabl-rails
   rack-mini-profiler
   rails (~> 5.1.0)