diff --git a/MetricsEvaluatorCode/Ruby/fairmetrics/Gemfile b/MetricsEvaluatorCode/Ruby/fairmetrics/Gemfile
index cd8ebb3..c408e2a 100644
--- a/MetricsEvaluatorCode/Ruby/fairmetrics/Gemfile
+++ b/MetricsEvaluatorCode/Ruby/fairmetrics/Gemfile
@@ -65,7 +65,7 @@ group :development, :test do
   # Use Passenger as the app server
   # gem 'passenger'
   # Use Puma as the app server
-   gem 'puma', '~> 3.12'
+   gem 'puma', '~> 5.3'
 end
 
 group :development do
@@ -75,7 +75,7 @@ group :development do
   # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
   gem 'spring'
   gem 'spring-watcher-listen', '~> 2.0.0'
-  gem 'puma', '~> 3.12'
+  gem 'puma', '~> 5.3'
 end
 
 group :production do
@@ -89,7 +89,7 @@ group :production do
   # Use Passenger as the app server
   #gem 'passenger'
   # Use Puma as the app server
-  gem 'puma', '~> 3.12'
+  gem 'puma', '~> 5.3'
 end
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
diff --git a/MetricsEvaluatorCode/Ruby/fairmetrics/Gemfile.lock b/MetricsEvaluatorCode/Ruby/fairmetrics/Gemfile.lock
index 0d179b0..4d47e07 100644
--- a/MetricsEvaluatorCode/Ruby/fairmetrics/Gemfile.lock
+++ b/MetricsEvaluatorCode/Ruby/fairmetrics/Gemfile.lock
@@ -185,7 +185,8 @@ GEM
     openssl (2.1.2)
     os (1.0.1)
     public_suffix (3.0.3)
-    puma (3.12.6)
+    puma (5.3.1)
+      nio4r (~> 2.0)
     rack (2.2.3)
     rack-cors (1.0.5)
       rack (>= 1.6.0)
@@ -335,7 +336,7 @@ DEPENDENCIES
   nokogiri
   open_api_parser
   openssl
-  puma (~> 3.12)
+  puma (~> 5.3)
   rack-cors
   rails (~> 5.1.6)
   rdf-json