diff --git a/Gemfile.lock b/Gemfile.lock
index a5378b21..6ba81997 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -77,7 +77,7 @@ GEM
       mini_portile2 (~> 2.1.0)
     pg (0.18.4)
     psych (2.0.17)
-    puma (3.11.3)
+    puma (3.12.4)
     racc (1.4.14)
     rack (1.6.9)
     rack-test (0.6.3)