diff --git a/Gemfile b/Gemfile
index deb26dc..eb74a77 100644
--- a/Gemfile
+++ b/Gemfile
@@ -80,7 +80,7 @@ end
 group :production do
   gem 'pg', '0.17.1'
   gem 'rails_12factor', '0.0.2'
-  gem 'puma', '2.11.1'
+  gem 'puma', '3.12.2'
 end
 
 # Docs say place at
diff --git a/Gemfile.lock b/Gemfile.lock
index e838058..93668a3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -281,13 +281,12 @@ GEM
       slop (~> 3.4)
     pry-rails (0.3.4)
       pry (>= 0.9.10)
-    puma (2.11.1)
-      rack (>= 1.1, < 2.0)
+    puma (3.12.2)
     pundit (1.0.1)
       activesupport (>= 3.0.0)
     quiet_assets (1.1.0)
       railties (>= 3.1, < 5.0)
-    rack (1.6.4)
+    rack (1.6.11)
     rack-contrib (1.4.0)
       git-version-bump (~> 0.15)
       rack (~> 1.4)
@@ -494,7 +493,7 @@ DEPENDENCIES
   pghero
   pry (~> 0.10.1)
   pry-rails (~> 0.3.4)
-  puma (= 2.11.1)
+  puma (= 3.12.2)
   pundit
   quiet_assets
   rack-mini-profiler