diff --git a/Gemfile b/Gemfile
index 974879dd..501096ba 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ gem 'sinatra', '~> 2.0.7'
 gem 'sinatra-contrib', '~> 2.0.7'
 gem 'nokogiri', '~> 1.10.8'
 gem 'mongo', '~> 2.10.1'
-gem 'puma', '~> 4.3.5'
+gem 'puma', '~> 4.3.12'
 
 group :production do
   gem 'capistrano', '~> 3.11.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 3cfb959c..b246d0fa 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -35,13 +35,13 @@ GEM
     net-scp (2.0.0)
       net-ssh (>= 2.6.5, < 6.0.0)
     net-ssh (5.2.0)
-    nio4r (2.5.2)
+    nio4r (2.5.8)
     nokogiri (1.10.8)
       mini_portile2 (~> 2.4.0)
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    puma (4.3.5)
+    puma (4.3.12)
       nio4r (~> 2.0)
     rack (2.2.3)
     rack-protection (2.0.7)
@@ -97,7 +97,7 @@ DEPENDENCIES
   mongo (~> 2.10.1)
   nokogiri (~> 1.10.8)
   pry (~> 0.12.2)
-  puma (~> 4.3.5)
+  puma (~> 4.3.12)
   rack-test (~> 1.1.0)
   rspec (~> 3.8.0)
   simplecov (~> 0.17.0)