diff --git a/Gemfile.lock b/Gemfile.lock
index d6d2cf1..b700251 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -83,7 +83,7 @@ GEM
     parslet (1.5.0)
       blankslate (~> 2.0)
     posix-spawn (0.3.9)
-    puma (3.12.2)
+    puma (3.12.4)
     pygments.rb (0.6.2)
       posix-spawn (~> 0.3.6)
       yajl-ruby (~> 1.2.0)