diff --git a/Gemfile.lock b/Gemfile.lock
index ffc7828..b49b05b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -77,7 +77,7 @@ GEM
     nio4r (1.2.1)
     nokogiri (1.6.7.2)
       mini_portile2 (~> 2.0.0.rc2)
-    puma (2.16.0)
+    puma (3.12.6)
     rack (2.0.0.alpha)
       json
     rack-test (0.6.3)