diff --git a/spec/stellar_app/Gemfile b/spec/stellar_app/Gemfile
index b24e7cc..a620dfc 100644
--- a/spec/stellar_app/Gemfile
+++ b/spec/stellar_app/Gemfile
@@ -9,7 +9,7 @@ gem "rails", "~> 5.2.1"
 # Use sqlite3 as the database for Active Record
 gem "sqlite3"
 # Use Puma as the app server
-gem "puma", "~> 3.11"
+gem "puma", "~> 3.12"
 # Use SCSS for stylesheets
 gem "sass-rails", "~> 5.0"
 # Use Uglifier as compressor for JavaScript assets
diff --git a/spec/stellar_app/Gemfile.lock b/spec/stellar_app/Gemfile.lock
index b779126..b4cc3dc 100644
--- a/spec/stellar_app/Gemfile.lock
+++ b/spec/stellar_app/Gemfile.lock
@@ -169,7 +169,7 @@ GEM
       byebug (~> 10.0)
       pry (~> 0.10)
     public_suffix (3.0.3)
-    puma (3.12.0)
+    puma (3.12.4)
     rack (2.0.8)
     rack-protection (2.0.5)
       rack
@@ -334,7 +334,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   pg (~> 1.0)
   pry-byebug
-  puma (~> 3.11)
+  puma (~> 3.12)
   rails (~> 5.2.1)
   sass-rails (~> 5.0)
   selenium-webdriver