diff --git a/backend/Gemfile b/backend/Gemfile
index 582edc8..3ed0430 100644
--- a/backend/Gemfile
+++ b/backend/Gemfile
@@ -7,7 +7,7 @@ end
 
 gem 'rails', '~> 5.1.5'
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 3.12'
 
 gem 'devise_token_auth'
 gem 'omniauth'
diff --git a/backend/Gemfile.lock b/backend/Gemfile.lock
index 90b7077..2c2ad79 100644
--- a/backend/Gemfile.lock
+++ b/backend/Gemfile.lock
@@ -88,7 +88,7 @@ GEM
       method_source (~> 0.9.0)
     pry-rails (0.3.6)
       pry (>= 0.10.4)
-    puma (3.11.3)
+    puma (3.12.4)
     rack (2.0.8)
     rack-protection (2.0.1)
       rack
@@ -177,7 +177,7 @@ DEPENDENCIES
   pg (>= 0.18, < 2.0)
   pry
   pry-rails
-  puma (~> 3.7)
+  puma (~> 3.12)
   rails (~> 5.1.5)
   redis
   rspec