diff --git a/Gemfile.lock b/Gemfile.lock
index 93ae07f..fa3ccda 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -126,7 +126,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    puma (2.15.3)
+    puma (3.12.6)
     rack (1.6.5)
     rack-test (0.6.3)
       rack (>= 1.0)