diff --git a/Gemfile.lock b/Gemfile.lock
index 25d72bc..da3f0da 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -17,7 +17,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    puma (3.4.0)
+    puma (3.12.6)
     rack (1.6.4)
     rack-protection (1.5.3)
       rack