diff --git a/Gemfile b/Gemfile
index e70eef95..3f1194ae 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 
 gem 'rails', '~> 5.0.4'
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 3.12', '>= 3.12.2'
 gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.3.0'
 gem 'coffee-rails', '~> 4.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index 5e7382b8..9fceb405 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -695,7 +695,7 @@ GEM
     npm-rails (0.2.1)
       rails (>= 3.2)
     pg (1.1.2)
-    puma (3.12.0)
+    puma (3.12.2)
     rack (2.0.7)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -799,7 +799,7 @@ DEPENDENCIES
   listen (~> 3.0.5)
   npm-rails
   pg
-  puma (~> 3.0)
+  puma (~> 3.12, >= 3.12.2)
   rails (~> 5.0.4)
   react-rails
   rest-client
@@ -817,4 +817,4 @@ RUBY VERSION
    ruby 2.5.1p57
 
 BUNDLED WITH
-   1.16.4
+   1.17.3