diff --git a/Gemfile.lock b/Gemfile.lock
index e9ed74f..de6d6dc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -116,7 +116,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    puma (2.13.0)
+    puma (2.13.4)
     rack (1.6.4)
     rack-pjax (0.8.0)
       nokogiri (~> 1.5)