diff --git a/Gemfile.lock b/Gemfile.lock
index 6940f0b..dc2d4ae 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -12,7 +12,7 @@ GEM
     i18n (1.0.0)
       concurrent-ruby (~> 1.0)
     minitest (5.11.3)
-    puma (3.11.4)
+    puma (3.12.3)
     rack (2.0.4)
     rspec (3.1.0)
       rspec-core (~> 3.1.0)