diff --git a/Gemfile.lock b/Gemfile.lock
index aff5b28..f7a1660 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -50,7 +50,7 @@ GEM
     pry (0.11.3)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    puma (4.3.9)
+    puma (4.3.12)
       nio4r (~> 2.0)
     rack (2.2.3)
     rack-protection (2.0.3)