diff --git a/Gemfile.lock b/Gemfile.lock
index 83be720..37330c5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -205,7 +205,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    puma (2.15.3)
+    puma (3.12.2)
     rack (1.4.7)
     rack-cache (1.5.1)
       rack (>= 0.4)