diff --git a/Gemfile.lock b/Gemfile.lock
index c609610..0b395bc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -209,7 +209,7 @@ GEM
       pry (>= 0.10.4)
     psych (3.1.0)
     public_suffix (4.0.1)
-    puma (4.3.1)
+    puma (4.3.3)
       nio4r (~> 2.0)
     rack (2.0.8)
     rack-proxy (0.6.5)